Merge tag 'driver-core-6.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

Pull driver core updates from Greg KH:
"Here is the large set of driver core changes for 6.3-rc1.

There's a lot of changes this development cycle, most of the work
falls into two different categories:

- fw_devlink fixes and updates. This has gone through numerous review
cycles and lots of review and testing by lots of different devices.
Hopefully all should be good now, and Saravana will be keeping a
watch for any potential regression on odd embedded systems.

- driver core changes to work to make struct bus_type able to be
moved into read-only memory (i.e. const) The recent work with Rust
has pointed out a number of areas in the driver core where we are
passing around and working with structures that really do not have
to be dynamic at all, and they should be able to be read-only
making things safer overall. This is the contuation of that work
(started last release with kobject changes) in moving struct
bus_type to be constant. We didn't quite make it for this release,
but the remaining patches will be finished up for the release after
this one, but the groundwork has been laid for this effort.

Other than that we have in here:

- debugfs memory leak fixes in some subsystems

- error path cleanups and fixes for some never-able-to-be-hit
codepaths.

- cacheinfo rework and fixes

- Other tiny fixes, full details are in the shortlog

All of these have been in linux-next for a while with no reported
problems"

[ Geert Uytterhoeven points out that that last sentence isn't true, and
that there's a pending report that has a fix that is queued up - Linus ]

* tag 'driver-core-6.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (124 commits)
debugfs: drop inline constant formatting for ERR_PTR(-ERROR)
OPP: fix error checking in opp_migrate_dentry()
debugfs: update comment of debugfs_rename()
i3c: fix device.h kernel-doc warnings
dma-mapping: no need to pass a bus_type into get_arch_dma_ops()
driver core: class: move EXPORT_SYMBOL_GPL() lines to the correct place
Revert "driver core: add error handling for devtmpfs_create_node()"
Revert "devtmpfs: add debug info to handle()"
Revert "devtmpfs: remove return value of devtmpfs_delete_node()"
driver core: cpu: don't hand-override the uevent bus_type callback.
devtmpfs: remove return value of devtmpfs_delete_node()
devtmpfs: add debug info to handle()
driver core: add error handling for devtmpfs_create_node()
driver core: bus: update my copyright notice
driver core: bus: add bus_get_dev_root() function
driver core: bus: constify bus_unregister()
driver core: bus: constify some internal functions
driver core: bus: constify bus_get_kset()
driver core: bus: constify bus_register/unregister_notifier()
driver core: remove private pointer from struct bus_type
...

Documentation/ABI/testing/sysfs-kernel-address_bits

···
+What:		/sys/kernel/address_bit
+Date:		May 2023
+KernelVersion:	6.3
+Contact:	Thomas Weißschuh <[e-mail]>
+Description:
+		The address size of the running kernel in bits.
+
+		Access: Read
+
+Users:		util-linux

Documentation/process/embargoed-hardware-issues.rst

···
   IBM Z		Christian Borntraeger <[e-mail]>
   Intel		Tony Luck <[e-mail]>
   Qualcomm	Trilok Soni <[e-mail]>
+  Samsung	Javier González <[e-mail]>
 
   Microsoft	James Morris <[e-mail]>
   VMware

arch/alpha/include/asm/dma-mapping.h

···
 
 extern const struct dma_map_ops alpha_pci_ops;
 
-static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
+static inline const struct dma_map_ops *get_arch_dma_ops(void)
 {
 #ifdef CONFIG_ALPHA_JENSEN
 	return NULL;

arch/arm64/kernel/cacheinfo.c

···
 int init_cache_level(unsigned int cpu)
 {
 	unsigned int ctype, level, leaves;
-	int fw_level;
+	int fw_level, ret;
 	struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
 
 	for (level = 1, leaves = 0; level <= MAX_CACHE_LEVEL; level++) {
···
 		leaves += (ctype == CACHE_TYPE_SEPARATE) ? 2 : 1;
 	}
 
-	if (acpi_disabled)
+	if (acpi_disabled) {
 		fw_level = of_find_last_cache_level(cpu);
-	else
-		fw_level = acpi_find_last_cache_level(cpu);
-
-	if (fw_level < 0)
-		return fw_level;
+	} else {
+		ret = acpi_get_cache_info(cpu, &fw_level, NULL);
+		if (ret < 0)
+			fw_level = 0;
+	}
 
 	if (level < fw_level) {
 		/*

arch/ia64/include/asm/dma-mapping.h

···
  */
 extern const struct dma_map_ops *dma_ops;
 
-static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
+static inline const struct dma_map_ops *get_arch_dma_ops(void)
 {
 	return dma_ops;
 }

arch/mips/include/asm/dma-mapping.h

···
 
 extern const struct dma_map_ops jazz_dma_ops;
 
-static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
+static inline const struct dma_map_ops *get_arch_dma_ops(void)
 {
 #if defined(CONFIG_MACH_JAZZ)
 	return &jazz_dma_ops;

arch/mips/sgi-ip22/ip22-gio.c

···
 };
 ATTRIBUTE_GROUPS(gio_dev);
 
-static int gio_device_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int gio_device_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
-	struct gio_device *gio_dev = to_gio_device(dev);
+	const struct gio_device *gio_dev = to_gio_device(dev);
 
 	add_uevent_var(env, "MODALIAS=gio:%x", gio_dev->id.id);
 	return 0;

arch/parisc/include/asm/dma-mapping.h

···
 
 extern const struct dma_map_ops *hppa_dma_ops;
 
-static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
+static inline const struct dma_map_ops *get_arch_dma_ops(void)
 {
 	return hppa_dma_ops;
 }

arch/parisc/kernel/drivers.c

···
 	return match_device(to_parisc_driver(drv), to_parisc_device(dev));
 }
 
-static ssize_t make_modalias(struct device *dev, char *buf)
+static ssize_t make_modalias(const struct device *dev, char *buf)
 {
 	const struct parisc_device *padev = to_parisc_device(dev);
 	const struct parisc_device_id *id = &padev->id;
···
 		(u32)id->sversion);
 }
 
-static int parisc_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int parisc_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
 	const struct parisc_device *padev;
 	char modalias[40];

arch/powerpc/include/asm/ps3.h

···
 	return container_of(_drv, struct ps3_system_bus_driver, core);
 }
 static inline struct ps3_system_bus_device *ps3_dev_to_system_bus_dev(
-	struct device *_dev)
+	const struct device *_dev)
 {
 	return container_of(_dev, struct ps3_system_bus_device, core);
 }

arch/powerpc/include/asm/vio.h

···
 	return container_of(drv, struct vio_driver, driver);
 }
 
-static inline struct vio_dev *to_vio_dev(struct device *dev)
-{
-	return container_of(dev, struct vio_dev, dev);
-}
+#define to_vio_dev(__dev)	container_of_const(__dev, struct vio_dev, dev)
 
 #endif /* __KERNEL__ */
 #endif /* _ASM_POWERPC_VIO_H */

arch/powerpc/platforms/ps3/system-bus.c

···
 	dev_dbg(&dev->core, " <- %s:%d\n", __func__, __LINE__);
 }
 
-static int ps3_system_bus_uevent(struct device *_dev, struct kobj_uevent_env *env)
+static int ps3_system_bus_uevent(const struct device *_dev, struct kobj_uevent_env *env)
 {
 	struct ps3_system_bus_device *dev = ps3_dev_to_system_bus_dev(_dev);
 

arch/powerpc/platforms/pseries/ibmebus.c

···
 };
 ATTRIBUTE_GROUPS(ibmebus_bus_device);
 
+static int ibmebus_bus_modalias(const struct device *dev, struct kobj_uevent_env *env)
+{
+	return of_device_uevent_modalias(dev, env);
+}
+
 struct bus_type ibmebus_bus_type = {
 	.name      = "ibmebus",
-	.uevent    = of_device_uevent_modalias,
+	.uevent    = ibmebus_bus_modalias,
 	.bus_groups = ibmbus_bus_groups,
 	.match     = ibmebus_bus_bus_match,
 	.probe     = ibmebus_bus_device_probe,

arch/powerpc/platforms/pseries/vio.c

···
 	return (ids != NULL) && (vio_match_device(ids, vio_dev) != NULL);
 }
 
-static int vio_hotplug(struct device *dev, struct kobj_uevent_env *env)
+static int vio_hotplug(const struct device *dev, struct kobj_uevent_env *env)
 {
 	const struct vio_dev *vio_dev = to_vio_dev(dev);
-	struct device_node *dn;
+	const struct device_node *dn;
 	const char *cp;
 
 	dn = dev->of_node;

arch/riscv/kernel/cacheinfo.c

···
 	}
 }
 
-int init_cache_level(unsigned int cpu)
-{
-	struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
-	struct device_node *np = of_cpu_device_node_get(cpu);
-	struct device_node *prev = NULL;
-	int levels = 0, leaves = 0, level;
-
-	if (of_property_read_bool(np, "cache-size"))
-		++leaves;
-	if (of_property_read_bool(np, "i-cache-size"))
-		++leaves;
-	if (of_property_read_bool(np, "d-cache-size"))
-		++leaves;
-	if (leaves > 0)
-		levels = 1;
-
-	prev = np;
-	while ((np = of_find_next_cache_node(np))) {
-		of_node_put(prev);
-		prev = np;
-		if (!of_device_is_compatible(np, "cache"))
-			break;
-		if (of_property_read_u32(np, "cache-level", &level))
-			break;
-		if (level <= levels)
-			break;
-		if (of_property_read_bool(np, "cache-size"))
-			++leaves;
-		if (of_property_read_bool(np, "i-cache-size"))
-			++leaves;
-		if (of_property_read_bool(np, "d-cache-size"))
-			++leaves;
-		levels = level;
-	}
-
-	of_node_put(np);
-	this_cpu_ci->num_levels = levels;
-	this_cpu_ci->num_leaves = leaves;
-
-	return 0;
-}
-
 int populate_cache_leaves(unsigned int cpu)
 {
 	struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);

arch/sparc/include/asm/dma-mapping.h

···
 
 extern const struct dma_map_ops *dma_ops;
 
-static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
+static inline const struct dma_map_ops *get_arch_dma_ops(void)
 {
 	/* sparc32 uses per-device dma_ops */
 	return IS_ENABLED(CONFIG_SPARC64) ? dma_ops : NULL;

arch/sparc/include/asm/vio.h

···
 	return container_of(drv, struct vio_driver, driver);
 }
 
-static inline struct vio_dev *to_vio_dev(struct device *dev)
-{
-	return container_of(dev, struct vio_dev, dev);
-}
+#define to_vio_dev(__dev)	container_of_const(__dev, struct vio_dev, dev)
 
 int vio_ldc_send(struct vio_driver_state *vio, void *data, int len);
 void vio_link_state_change(struct vio_driver_state *vio, int event);

arch/sparc/kernel/vio.c

···
 	return NULL;
 }
 
-static int vio_hotplug(struct device *dev, struct kobj_uevent_env *env)
+static int vio_hotplug(const struct device *dev, struct kobj_uevent_env *env)
 {
 	const struct vio_dev *vio_dev = to_vio_dev(dev);
 

arch/x86/include/asm/dma-mapping.h

···
 
 extern const struct dma_map_ops *dma_ops;
 
-static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
+static inline const struct dma_map_ops *get_arch_dma_ops(void)
 {
 	return dma_ops;
 }

block/genhd.c

···
 	.dev_uevent	= block_uevent,
 };
 
-static char *block_devnode(struct device *dev, umode_t *mode,
+static char *block_devnode(const struct device *dev, umode_t *mode,
 			   kuid_t *uid, kgid_t *gid)
 {
 	struct gendisk *disk = dev_to_disk(dev);

block/partitions/core.c

···
 	iput(dev_to_bdev(dev)->bd_inode);
 }
 
-static int part_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int part_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
-	struct block_device *part = dev_to_bdev(dev);
+	const struct block_device *part = dev_to_bdev(dev);
 
 	add_uevent_var(env, "PARTN=%u", part->bd_partno);
 	if (part->bd_meta_info && part->bd_meta_info->volname[0])

drivers/acpi/bus.c

···
 		&& !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
 }
 
-static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int acpi_device_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
 	return __acpi_device_uevent_modalias(to_acpi_device(dev), env);
 }

drivers/acpi/device_sysfs.c

···
  *         -EINVAL: output error
  *         -ENOMEM: output is truncated
  */
-static int create_pnp_modalias(struct acpi_device *acpi_dev, char *modalias,
+static int create_pnp_modalias(const struct acpi_device *acpi_dev, char *modalias,
 			       int size)
 {
 	int len;
···
  * only be called for devices having ACPI_DT_NAMESPACE_HID in their list of
  * ACPI/PNP IDs.
  */
-static int create_of_modalias(struct acpi_device *acpi_dev, char *modalias,
+static int create_of_modalias(const struct acpi_device *acpi_dev, char *modalias,
 			      int size)
 {
 	struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER };
···
 	return len;
 }
 
-int __acpi_device_uevent_modalias(struct acpi_device *adev,
+int __acpi_device_uevent_modalias(const struct acpi_device *adev,
 				  struct kobj_uevent_env *env)
 {
 	int len;
···
  * Because other buses do not support ACPI HIDs & CIDs, e.g. for a device with
  * hid:IBM0001 and cid:ACPI0001 you get: "acpi:IBM0001:ACPI0001".
  */
-int acpi_device_uevent_modalias(struct device *dev, struct kobj_uevent_env *env)
+int acpi_device_uevent_modalias(const struct device *dev, struct kobj_uevent_env *env)
 {
 	return __acpi_device_uevent_modalias(acpi_companion_match(dev), env);
 }

drivers/acpi/internal.h

···
                      Device Matching and Notification
    -------------------------------------------------------------------------- */
 struct acpi_device *acpi_companion_match(const struct device *dev);
-int __acpi_device_uevent_modalias(struct acpi_device *adev,
+int __acpi_device_uevent_modalias(const struct acpi_device *adev,
 				  struct kobj_uevent_env *env);
 
 /* --------------------------------------------------------------------------

drivers/acpi/pptt.c

···
  * acpi_pptt_walk_cache() - Attempt to find the requested acpi_pptt_cache
  * @table_hdr: Pointer to the head of the PPTT table
  * @local_level: passed res reflects this cache level
+ * @split_levels: Number of split cache levels (data/instruction).
  * @res: cache resource in the PPTT we want to walk
  * @found: returns a pointer to the requested level if found
  * @level: the requested cache level
···
  */
 static unsigned int acpi_pptt_walk_cache(struct acpi_table_header *table_hdr,
 					 unsigned int local_level,
+					 unsigned int *split_levels,
 					 struct acpi_subtable_header *res,
 					 struct acpi_pptt_cache **found,
 					 unsigned int level, int type)
···
 	while (cache) {
 		local_level++;
 
+		if (!(cache->flags & ACPI_PPTT_CACHE_TYPE_VALID)) {
+			cache = fetch_pptt_cache(table_hdr, cache->next_level_of_cache);
+			continue;
+		}
+
+		if (split_levels &&
+		    (acpi_pptt_match_type(cache->attributes, ACPI_PPTT_CACHE_TYPE_DATA) ||
+		     acpi_pptt_match_type(cache->attributes, ACPI_PPTT_CACHE_TYPE_INSTR)))
+			*split_levels = local_level;
+
 		if (local_level == level &&
-		    cache->flags & ACPI_PPTT_CACHE_TYPE_VALID &&
 		    acpi_pptt_match_type(cache->attributes, type)) {
 			if (*found != NULL && cache != *found)
 				pr_warn("Found duplicate cache level/type unable to determine uniqueness\n");
···
 static struct acpi_pptt_cache *
 acpi_find_cache_level(struct acpi_table_header *table_hdr,
 		      struct acpi_pptt_processor *cpu_node,
-		      unsigned int *starting_level, unsigned int level,
-		      int type)
+		      unsigned int *starting_level, unsigned int *split_levels,
+		      unsigned int level, int type)
 {
 	struct acpi_subtable_header *res;
 	unsigned int number_of_levels = *starting_level;
···
 		resource++;
 
 		local_level = acpi_pptt_walk_cache(table_hdr, *starting_level,
-						   res, &ret, level, type);
+						   split_levels, res, &ret,
+						   level, type);
 		/*
 		 * we are looking for the max depth. Since its potentially
 		 * possible for a given node to have resources with differing
···
 }
 
 /**
- * acpi_count_levels() - Given a PPTT table, and a CPU node, count the caches
+ * acpi_count_levels() - Given a PPTT table, and a CPU node, count the cache
+ * levels and split cache levels (data/instruction).
  * @table_hdr: Pointer to the head of the PPTT table
  * @cpu_node: processor node we wish to count caches for
+ * @levels: Number of levels if success.
+ * @split_levels:	Number of split cache levels (data/instruction) if
+ *			success. Can by NULL.
  *
  * Given a processor node containing a processing unit, walk into it and count
  * how many levels exist solely for it, and then walk up each level until we hit
  * the root node (ignore the package level because it may be possible to have
- * caches that exist across packages). Count the number of cache levels that
- * exist at each level on the way up.
- *
- * Return: Total number of levels found.
+ * caches that exist across packages). Count the number of cache levels and
+ * split cache levels (data/instruction) that exist at each level on the way
+ * up.
  */
-static int acpi_count_levels(struct acpi_table_header *table_hdr,
-			     struct acpi_pptt_processor *cpu_node)
+static void acpi_count_levels(struct acpi_table_header *table_hdr,
+			      struct acpi_pptt_processor *cpu_node,
+			      unsigned int *levels, unsigned int *split_levels)
 {
-	int total_levels = 0;
-
 	do {
-		acpi_find_cache_level(table_hdr, cpu_node, &total_levels, 0, 0);
+		acpi_find_cache_level(table_hdr, cpu_node, levels, split_levels, 0, 0);
 		cpu_node = fetch_pptt_node(table_hdr, cpu_node->parent);
 	} while (cpu_node);
-
-	return total_levels;
 }
 
 /**
···
 	return NULL;
 }
 
-static int acpi_find_cache_levels(struct acpi_table_header *table_hdr,
-				  u32 acpi_cpu_id)
-{
-	int number_of_levels = 0;
-	struct acpi_pptt_processor *cpu;
-
-	cpu = acpi_find_processor_node(table_hdr, acpi_cpu_id);
-	if (cpu)
-		number_of_levels = acpi_count_levels(table_hdr, cpu);
-
-	return number_of_levels;
-}
-
 static u8 acpi_cache_type(enum cache_type type)
 {
 	switch (type) {
···
 
 	while (cpu_node && !found) {
 		found = acpi_find_cache_level(table_hdr, cpu_node,
-					      &total_levels, level, acpi_type);
+					      &total_levels, NULL, level, acpi_type);
 		*node = cpu_node;
 		cpu_node = fetch_pptt_node(table_hdr, cpu_node->parent);
 	}
···
 }
 
 /**
- * acpi_find_last_cache_level() - Determines the number of cache levels for a PE
+ * acpi_get_cache_info() - Determine the number of cache levels and
+ * split cache levels (data/instruction) and for a PE.
  * @cpu: Kernel logical CPU number
+ * @levels: Number of levels if success.
+ * @split_levels:	Number of levels being split (i.e. data/instruction)
+ *			if success. Can by NULL.
  *
  * Given a logical CPU number, returns the number of levels of cache represented
  * in the PPTT. Errors caused by lack of a PPTT table, or otherwise, return 0
  * indicating we didn't find any cache levels.
  *
- * Return: Cache levels visible to this core.
+ * Return: -ENOENT if no PPTT table or no PPTT processor struct found.
+ *	   0 on success.
  */
-int acpi_find_last_cache_level(unsigned int cpu)
+int acpi_get_cache_info(unsigned int cpu, unsigned int *levels,
+			unsigned int *split_levels)
 {
-	u32 acpi_cpu_id;
+	struct acpi_pptt_processor *cpu_node;
 	struct acpi_table_header *table;
-	int number_of_levels = 0;
+	u32 acpi_cpu_id;
+
+	*levels = 0;
+	if (split_levels)
+		*split_levels = 0;
 
 	table = acpi_get_pptt();
 	if (!table)
 		return -ENOENT;
 
-	pr_debug("Cache Setup find last level CPU=%d\n", cpu);
+	pr_debug("Cache Setup: find cache levels for CPU=%d\n", cpu);
 
 	acpi_cpu_id = get_acpi_id_for_cpu(cpu);
-	number_of_levels = acpi_find_cache_levels(table, acpi_cpu_id);
-	pr_debug("Cache Setup find last level level=%d\n", number_of_levels);
+	cpu_node = acpi_find_processor_node(table, acpi_cpu_id);
+	if (!cpu_node)
+		return -ENOENT;
 
-	return number_of_levels;
+	acpi_count_levels(table, cpu_node, levels, split_levels);
+
+	pr_debug("Cache Setup: last_level=%d split_levels=%d\n",
+		 *levels, split_levels ? *split_levels : -1);
+
+	return 0;
 }
 
 /**

drivers/amba/bus.c

···
 	return amba_lookup(pcdrv->id_table, pcdev) != NULL;
 }
 
-static int amba_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int amba_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
-	struct amba_device *pcdev = to_amba_device(dev);
+	const struct amba_device *pcdev = to_amba_device(dev);
 	int retval = 0;
 
 	retval = add_uevent_var(env, "AMBA_ID=%08x", pcdev->periphid);

drivers/base/arch_topology.c

···
 
 	ret = detect_cache_attributes(cpuid);
 	if (ret && ret != -ENOENT)
-		pr_info("Early cacheinfo failed, ret = %d\n", ret);
+		pr_info("Early cacheinfo allocation failed, ret = %d\n", ret);
 
 	/* update core and thread sibling masks */
 	for_each_online_cpu(cpu) {
···
 #if defined(CONFIG_ARM64) || defined(CONFIG_RISCV)
 void __init init_cpu_topology(void)
 {
-	int ret;
+	int cpu, ret;
 
 	reset_cpu_topology();
 	ret = parse_acpi_topology();
···
 		 */
 		reset_cpu_topology();
 		return;
+	}
+
+	for_each_possible_cpu(cpu) {
+		ret = fetch_cache_info(cpu);
+		if (ret) {
+			pr_err("Early cacheinfo failed, ret = %d\n", ret);
+			break;
+		}
 	}
 }
 

drivers/base/auxiliary.c

···
 	return !!auxiliary_match_id(auxdrv->id_table, auxdev);
 }
 
-static int auxiliary_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int auxiliary_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
 	const char *name, *p;
 

drivers/base/base.h

···
 
 	struct kset glue_dirs;
 	struct class *class;
+
+	struct lock_class_key lock_key;
 };
-#define to_subsys_private(obj) container_of(obj, struct subsys_private, subsys.kobj)
+#define to_subsys_private(obj) container_of_const(obj, struct subsys_private, subsys.kobj)
+
+static inline struct subsys_private *subsys_get(struct subsys_private *sp)
+{
+	if (sp)
+		kset_get(&sp->subsys);
+	return sp;
+}
+
+static inline void subsys_put(struct subsys_private *sp)
+{
+	if (sp)
+		kset_put(&sp->subsys);
+}
 
 struct driver_private {
 	struct kobject kobj;
···
 extern int bus_add_device(struct device *dev);
 extern void bus_probe_device(struct device *dev);
 extern void bus_remove_device(struct device *dev);
+void bus_notify(struct device *dev, enum bus_notifier_event value);
+bool bus_is_registered(const struct bus_type *bus);
 
 extern int bus_add_driver(struct device_driver *drv);
 extern void bus_remove_driver(struct device_driver *drv);
···
 extern void device_unblock_probing(void);
 extern void deferred_probe_extend_timeout(void);
 extern void driver_deferred_probe_trigger(void);
+const char *device_get_devnode(const struct device *dev, umode_t *mode,
+			       kuid_t *uid, kgid_t *gid, const char **tmp);
 
 /* /sys/devices directory */
 extern struct kset *devices_kset;

drivers/base/bus.c

···
  * Copyright (c) 2002-3 Open Source Development Labs
  * Copyright (c) 2007 Greg Kroah-Hartman <[e-mail]>
  * Copyright (c) 2007 Novell Inc.
+ * Copyright (c) 2023 Greg Kroah-Hartman <[e-mail]>
  */
 
 #include <linux/async.h>
···
 /* /sys/devices/system */
 static struct kset *system_kset;
 
+/* /sys/bus */
+static struct kset *bus_kset;
+
 #define to_bus_attr(_attr) container_of(_attr, struct bus_attribute, attr)
 
 /*
···
 static int __must_check bus_rescan_devices_helper(struct device *dev,
 						void *data);
 
+/**
+ * bus_to_subsys - Turn a struct bus_type into a struct subsys_private
+ *
+ * @bus: pointer to the struct bus_type to look up
+ *
+ * The driver core internals needs to work on the subsys_private structure, not
+ * the external struct bus_type pointer.  This function walks the list of
+ * registered busses in the system and finds the matching one and returns the
+ * internal struct subsys_private that relates to that bus.
+ *
+ * Note, the reference count of the return value is INCREMENTED if it is not
+ * NULL.  A call to subsys_put() must be done when finished with the pointer in
+ * order for it to be properly freed.
+ */
+static struct subsys_private *bus_to_subsys(const struct bus_type *bus)
+{
+	struct subsys_private *sp = NULL;
+	struct kobject *kobj;
+
+	if (!bus)
+		return NULL;
+
+	spin_lock(&bus_kset->list_lock);
+
+	if (list_empty(&bus_kset->list))
+		goto done;
+
+	list_for_each_entry(kobj, &bus_kset->list, entry) {
+		struct kset *kset = container_of(kobj, struct kset, kobj);
+
+		sp = container_of_const(kset, struct subsys_private, subsys);
+		if (sp->bus == bus)
+			goto done;
+	}
+	sp = NULL;
+done:
+	sp = subsys_get(sp);
+	spin_unlock(&bus_kset->list_lock);
+	return sp;
+}
+
 static struct bus_type *bus_get(struct bus_type *bus)
 {
-	if (bus) {
-		kset_get(&bus->p->subsys);
+	struct subsys_private *sp = bus_to_subsys(bus);
+
+	if (sp)
 		return bus;
-	}
 	return NULL;
 }
 
-static void bus_put(struct bus_type *bus)
+static void bus_put(const struct bus_type *bus)
 {
-	if (bus)
-		kset_put(&bus->p->subsys);
+	struct subsys_private *sp = bus_to_subsys(bus);
+
+	/* two puts are required as the call to bus_to_subsys incremented it again */
+	subsys_put(sp);
+	subsys_put(sp);
 }
 
 static ssize_t drv_attr_show(struct kobject *kobj, struct attribute *attr,
···
 	kfree(drv_priv);
 }
 
-static struct kobj_type driver_ktype = {
+static const struct kobj_type driver_ktype = {
 	.sysfs_ops	= &driver_sysfs_ops,
 	.release	= driver_release,
 };
···
 	.store	= bus_attr_store,
 };
 
-int bus_create_file(struct bus_type *bus, struct bus_attribute *attr)
+int bus_create_file(const struct bus_type *bus, struct bus_attribute *attr)
 {
+	struct subsys_private *sp = bus_to_subsys(bus);
 	int error;
-	if (bus_get(bus)) {
-		error = sysfs_create_file(&bus->p->subsys.kobj, &attr->attr);
-		bus_put(bus);
-	} else
-		error = -EINVAL;
+
+	if (!sp)
+		return -EINVAL;
+
+	error = sysfs_create_file(&sp->subsys.kobj, &attr->attr);
+
+	subsys_put(sp);
 	return error;
 }
 EXPORT_SYMBOL_GPL(bus_create_file);
 
-void bus_remove_file(struct bus_type *bus, struct bus_attribute *attr)
+void bus_remove_file(const struct bus_type *bus, struct bus_attribute *attr)
 {
-	if (bus_get(bus)) {
-		sysfs_remove_file(&bus->p->subsys.kobj, &attr->attr);
-		bus_put(bus);
-	}
+	struct subsys_private *sp = bus_to_subsys(bus);
+
+	if (!sp)
+		return;
+
+	sysfs_remove_file(&sp->subsys.kobj, &attr->attr);
+	subsys_put(sp);
 }
 EXPORT_SYMBOL_GPL(bus_remove_file);
 
 static void bus_release(struct kobject *kobj)
 {
 	struct subsys_private *priv = to_subsys_private(kobj);
-	struct bus_type *bus = priv->bus;
 
+	lockdep_unregister_key(&priv->lock_key);
 	kfree(priv);
-	bus->p = NULL;
 }
 
-static struct kobj_type bus_ktype = {
+static const struct kobj_type bus_ktype = {
 	.sysfs_ops	= &bus_sysfs_ops,
 	.release	= bus_release,
 };
···
 static const struct kset_uevent_ops bus_uevent_ops = {
 	.filter = bus_uevent_filter,
 };
-
-static struct kset *bus_kset;
 
 /* Manually detach a device from its associated driver. */
 static ssize_t unbind_store(struct device_driver *drv, const char *buf,
···
 
 static ssize_t drivers_autoprobe_show(struct bus_type *bus, char *buf)
 {
-	return sysfs_emit(buf, "%d\n", bus->p->drivers_autoprobe);
+	struct subsys_private *sp = bus_to_subsys(bus);
+	int ret;
+
+	if (!sp)
+		return -EINVAL;
+
+	ret = sysfs_emit(buf, "%d\n", sp->drivers_autoprobe);
+	subsys_put(sp);
+	return ret;
 }
 
 static ssize_t drivers_autoprobe_store(struct bus_type *bus,
 				       const char *buf, size_t count)
 {
+	struct subsys_private *sp = bus_to_subsys(bus);
+
+	if (!sp)
+		return -EINVAL;
+
 	if (buf[0] == '0')
-		bus->p->drivers_autoprobe = 0;
+		sp->drivers_autoprobe = 0;
 	else
-		bus->p->drivers_autoprobe = 1;
+		sp->drivers_autoprobe = 1;
+
+	subsys_put(sp);
 	return count;
 }
 
···
  * to retain this data, it should do so, and increment the reference
  * count in the supplied callback.
  */
-int bus_for_each_dev(struct bus_type *bus, struct device *start,
+int bus_for_each_dev(const struct bus_type *bus, struct device *start,
 		     void *data, int (*fn)(struct device *, void *))
 {
+	struct subsys_private *sp = bus_to_subsys(bus);
 	struct klist_iter i;
 	struct device *dev;
 	int error = 0;
 
-	if (!bus || !bus->p)
+	if (!sp)
 		return -EINVAL;
 
-	klist_iter_init_node(&bus->p->klist_devices, &i,
+	klist_iter_init_node(&sp->klist_devices, &i,
 			     (start ? &start->p->knode_bus : NULL));
 	while (!error && (dev = next_device(&i)))
 		error = fn(dev, data);
 	klist_iter_exit(&i);
+	subsys_put(sp);
 	return error;
 }
 EXPORT_SYMBOL_GPL(bus_for_each_dev);
···
  * if it does.  If the callback returns non-zero, this function will
  * return to the caller and not iterate over any more devices.
  */
-struct device *bus_find_device(struct bus_type *bus,
+struct device *bus_find_device(const struct bus_type *bus,
 			       struct device *start, const void *data,
 			       int (*match)(struct device *dev, const void *data))
 {
+	struct subsys_private *sp = bus_to_subsys(bus);
 	struct klist_iter i;
 	struct device *dev;
 
-	if (!bus || !bus->p)
+	if (!sp)
 		return NULL;
 
-	klist_iter_init_node(&bus->p->klist_devices, &i,
+	klist_iter_init_node(&sp->klist_devices, &i,
 			     (start ? &start->p->knode_bus : NULL));
 	while ((dev = next_device(&i)))
 		if (match(dev, data) && get_device(dev))
 			break;
 	klist_iter_exit(&i);
+	subsys_put(sp);
 	return dev;
 }
 EXPORT_SYMBOL_GPL(bus_find_device);
-
-/**
- * subsys_find_device_by_id - find a device with a specific enumeration number
- * @subsys: subsystem
- * @id: index 'id' in struct device
- * @hint: device to check first
- *
- * Check the hint's next object and if it is a match return it directly,
- * otherwise, fall back to a full list search. Either way a reference for
- * the returned object is taken.
- */
-struct device *subsys_find_device_by_id(struct bus_type *subsys, unsigned int id,
-					struct device *hint)
-{
-	struct klist_iter i;
-	struct device *dev;
-
-	if (!subsys)
-		return NULL;
-
-	if (hint) {
-		klist_iter_init_node(&subsys->p->klist_devices, &i, &hint->p->knode_bus);
-		dev = next_device(&i);
-		if (dev && dev->id == id && get_device(dev)) {
-			klist_iter_exit(&i);
-			return dev;
-		}
-		klist_iter_exit(&i);
-	}
-
-	klist_iter_init_node(&subsys->p->klist_devices, &i, NULL);
-	while ((dev = next_device(&i))) {
-		if (dev->id == id && get_device(dev)) {
-			klist_iter_exit(&i);
-			return dev;
-		}
-	}
-	klist_iter_exit(&i);
-	return NULL;
-}
-EXPORT_SYMBOL_GPL(subsys_find_device_by_id);
 
 static struct device_driver *next_driver(struct klist_iter *i)
 {
···
  * in the callback. It must also be sure to increment the refcount
  * so it doesn't disappear before returning to the caller.
  */
-int bus_for_each_drv(struct bus_type *bus, struct device_driver *start,
+int bus_for_each_drv(const struct bus_type *bus, struct device_driver *start,
 		     void *data, int (*fn)(struct device_driver *, void *))
 {
+	struct subsys_private *sp = bus_to_subsys(bus);
 	struct klist_iter i;
 	struct device_driver *drv;
 	int error = 0;
 
-	if (!bus)
+	if (!sp)
 		return -EINVAL;
 
-	klist_iter_init_node(&bus->p->klist_drivers, &i,
+	klist_iter_init_node(&sp->klist_drivers, &i,
 			     start ? &start->p->knode_bus : NULL);
 	while ((drv = next_driver(&i)) && !error)
 		error = fn(drv, data);
 	klist_iter_exit(&i);
+	subsys_put(sp);
 	return error;
 }
 EXPORT_SYMBOL_GPL(bus_for_each_drv);
···
  */
 int bus_add_device(struct device *dev)
 {
-	struct bus_type *bus = bus_get(dev->bus);
-	int error = 0;
+	struct subsys_private *sp = bus_to_subsys(dev->bus);
+	int error;
 
-	if (bus) {
-		pr_debug("bus: '%s': add device %s\n", bus->name, dev_name(dev));
-		error = device_add_groups(dev, bus->dev_groups);
-		if (error)
-			goto out_put;
-		error = sysfs_create_link(&bus->p->devices_kset->kobj,
-						&dev->kobj, dev_name(dev));
-		if (error)
-			goto out_groups;
-		error = sysfs_create_link(&dev->kobj,
-				&dev->bus->p->subsys.kobj, "subsystem");
-		if (error)
-			goto out_subsys;
-		klist_add_tail(&dev->p->knode_bus, &bus->p->klist_devices);
+	if (!sp) {
+		/*
+		 * This is a normal operation for many devices that do not
+		 * have a bus assigned to them, just say that all went
+		 * well.
+		 */
+		return 0;
 	}
+
+	/*
+	 * Reference in sp is now incremented and will be dropped when
+	 * the device is removed from the bus
+	 */
+
+	pr_debug("bus: '%s': add device %s\n", sp->bus->name, dev_name(dev));
+
+	error = device_add_groups(dev, sp->bus->dev_groups);
+	if (error)
+		goto out_put;
+
+	error = sysfs_create_link(&sp->devices_kset->kobj, &dev->kobj, dev_name(dev));
+	if (error)
+		goto out_groups;
+
+	error = sysfs_create_link(&dev->kobj, &sp->subsys.kobj, "subsystem");
+	if (error)
+		goto out_subsys;
+
+	klist_add_tail(&dev->p->knode_bus, &sp->klist_devices);
 	return 0;
 
 out_subsys:
-	sysfs_remove_link(&bus->p->devices_kset->kobj, dev_name(dev));
+	sysfs_remove_link(&sp->devices_kset->kobj, dev_name(dev));
 out_groups:
-	device_remove_groups(dev, bus->dev_groups);
+	device_remove_groups(dev, sp->bus->dev_groups);
 out_put:
-	bus_put(dev->bus);
+	subsys_put(sp);
 	return error;
 }
 
···
  */
 void bus_probe_device(struct device *dev)
 {
-	struct bus_type *bus = dev->bus;
+	struct subsys_private *sp = bus_to_subsys(dev->bus);
 	struct subsys_interface *sif;
 
-	if (!bus)
+	if (!sp)
 		return;
 
-	if (bus->p->drivers_autoprobe)
+	if (sp->drivers_autoprobe)
 		device_initial_probe(dev);
 
-	mutex_lock(&bus->p->mutex);
-	list_for_each_entry(sif, &bus->p->interfaces, node)
+	mutex_lock(&sp->mutex);
+	list_for_each_entry(sif, &sp->interfaces, node)
 		if (sif->add_dev)
 			sif->add_dev(dev, sif);
-	mutex_unlock(&bus->p->mutex);
+	mutex_unlock(&sp->mutex);
+	subsys_put(sp);
 }
 
 /**
···
  */
 void bus_remove_device(struct device *dev)
 {
-	struct bus_type *bus = dev->bus;
+	struct subsys_private *sp = bus_to_subsys(dev->bus);
 	struct subsys_interface *sif;
 
-	if (!bus)
+	if (!sp)
 		return;
 
-	mutex_lock(&bus->p->mutex);
-	list_for_each_entry(sif, &bus->p->interfaces, node)
+	mutex_lock(&sp->mutex);
+	list_for_each_entry(sif, &sp->interfaces, node)
 		if (sif->remove_dev)
 			sif->remove_dev(dev, sif);
-	mutex_unlock(&bus->p->mutex);
+	mutex_unlock(&sp->mutex);
 
 	sysfs_remove_link(&dev->kobj, "subsystem");
-	sysfs_remove_link(&dev->bus->p->devices_kset->kobj,
-			  dev_name(dev));
+	sysfs_remove_link(&sp->devices_kset->kobj, dev_name(dev));
 	device_remove_groups(dev, dev->bus->dev_groups);
 	if (klist_node_attached(&dev->p->knode_bus))
 		klist_del(&dev->p->knode_bus);
···
 	pr_debug("bus: '%s': remove device %s\n",
 		 dev->bus->name, dev_name(dev));
 	device_release_driver(dev);
-	bus_put(dev->bus);
+
+	/*
+	 * Decrement the reference count twice, once for the bus_to_subsys()
+	 * call in the start of this function, and the second one from the
+	 * reference increment in bus_add_device()
+	 */
+	subsys_put(sp);
+	subsys_put(sp);
 }
 
 static int __must_check add_bind_files(struct device_driver *drv)
···
 static BUS_ATTR_WO(drivers_probe);
 static BUS_ATTR_RW(drivers_autoprobe);
 
-static int add_probe_files(struct bus_type *bus)
+static int add_probe_files(const struct bus_type *bus)
 {
 	int retval;
 
···
 	return retval;
 }
 
-static void remove_probe_files(struct bus_type *bus)
+static void remove_probe_files(const struct bus_type *bus)
 {
 	bus_remove_file(bus, &bus_attr_drivers_autoprobe);
 	bus_remove_file(bus, &bus_attr_drivers_probe);
···
  */
 int bus_add_driver(struct device_driver *drv)
 {
-	struct bus_type *bus;
+	struct subsys_private *sp = bus_to_subsys(drv->bus);
 	struct driver_private *priv;
 	int error = 0;
 
-	bus = bus_get(drv->bus);
-	if (!bus)
+	if (!sp)
 		return -EINVAL;
 
-	pr_debug("bus: '%s': add driver %s\n", bus->name, drv->name);
+	/*
+	 * Reference in sp is now incremented and will be dropped when
+	 * the driver is removed from the bus
+	 */
+	pr_debug("bus: '%s': add driver %s\n", sp->bus->name, drv->name);
 
 	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 	if (!priv) {
···
 	klist_init(&priv->klist_devices, NULL, NULL);
 	priv->driver = drv;
 	drv->p = priv;
-	priv->kobj.kset = bus->p->drivers_kset;
+	priv->kobj.kset = sp->drivers_kset;
 	error = kobject_init_and_add(&priv->kobj, &driver_ktype, NULL,
 				     "%s", drv->name);
 	if (error)
 		goto out_unregister;
 
-	klist_add_tail(&priv->knode_bus, &bus->p->klist_drivers);
-	if (drv->bus->p->drivers_autoprobe) {
+	klist_add_tail(&priv->knode_bus, &sp->klist_drivers);
+	if (sp->drivers_autoprobe) {
 		error = driver_attach(drv);
 		if (error)
 			goto out_del_list;
···
 		printk(KERN_ERR "%s: uevent attr (%s) failed\n",
 			__func__, drv->name);
 	}
-	error = driver_add_groups(drv, bus->drv_groups);
+	error = driver_add_groups(drv, sp->bus->drv_groups);
 	if (error) {
 		/* How the hell do we get out of this pickle? Give up */
 		printk(KERN_ERR "%s: driver_add_groups(%s) failed\n",
···
 	/* drv->p is freed in driver_release()  */
 	drv->p = NULL;
 out_put_bus:
-	bus_put(bus);
+	subsys_put(sp);
 	return error;
 }
 
···
  */
 void bus_remove_driver(struct device_driver *drv)
 {
-	if (!drv->bus)
+	struct subsys_private *sp = bus_to_subsys(drv->bus);
+
+	if (!sp)
 		return;
+
+	pr_debug("bus: '%s': remove driver %s\n", sp->bus->name, drv->name);
 
 	if (!drv->suppress_bind_attrs)
 		remove_bind_files(drv);
-	driver_remove_groups(drv, drv->bus->drv_groups);
+	driver_remove_groups(drv, sp->bus->drv_groups);
 	driver_remove_file(drv, &driver_attr_uevent);
 	klist_remove(&drv->p->knode_bus);
-	pr_debug("bus: '%s': remove driver %s\n", drv->bus->name, drv->name);
 	driver_detach(drv);
 	module_remove_driver(drv);
 	kobject_put(&drv->p->kobj);
-	bus_put(drv->bus);
+
+	/*
+	 * Decrement the reference count twice, once for the bus_to_subsys()
+	 * call in the start of this function, and the second one from the
+	 * reference increment in bus_add_driver()
+	 */
+	subsys_put(sp);
+	subsys_put(sp);
 }
 
 /* Helper for bus_rescan_devices's iter */
···
 }
 EXPORT_SYMBOL_GPL(device_reprobe);
 
-static int bus_add_groups(struct bus_type *bus,
-			  const struct attribute_group **groups)
-{
-	return sysfs_create_groups(&bus->p->subsys.kobj, groups);
-}
-
-static void bus_remove_groups(struct bus_type *bus,
-			      const struct attribute_group **groups)
-{
-	sysfs_remove_groups(&bus->p->subsys.kobj, groups);
-}
-
 static void klist_devices_get(struct klist_node *n)
 {
 	struct device_private *dev_prv = to_device_private_bus(n);
···
 static ssize_t bus_uevent_store(struct bus_type *bus,
 				const char *buf, size_t count)
 {
-	int rc;
+	struct subsys_private *sp = bus_to_subsys(bus);
+	int ret;
 
-	rc = kobject_synth_uevent(&bus->p->subsys.kobj, buf, count);
-	return rc ? rc : count;
+	if (!sp)
+		return -EINVAL;
+
+	ret = kobject_synth_uevent(&sp->subsys.kobj, buf, count);
+	subsys_put(sp);
+
+	if (ret)
+		return ret;
+	return count;
 }
 /*
  * "open code" the old BUS_ATTR() macro here.  We want to use BUS_ATTR_WO()
···
 {
 	int retval;
 	struct subsys_private *priv;
-	struct lock_class_key *key = &bus->lock_key;
+	struct kobject *bus_kobj;
+	struct lock_class_key *key;
 
 	priv = kzalloc(sizeof(struct subsys_private), GFP_KERNEL);
 	if (!priv)
 		return -ENOMEM;
 
 	priv->bus = bus;
-	bus->p = priv;
 
 	BLOCKING_INIT_NOTIFIER_HEAD(&priv->bus_notifier);
 
-	retval = kobject_set_name(&priv->subsys.kobj, "%s", bus->name);
+	bus_kobj = &priv->subsys.kobj;
+	retval = kobject_set_name(bus_kobj, "%s", bus->name);
 	if (retval)
 		goto out;
 
-	priv->subsys.kobj.kset = bus_kset;
-	priv->subsys.kobj.ktype = &bus_ktype;
+	bus_kobj->kset = bus_kset;
+	bus_kobj->ktype = &bus_ktype;
 	priv->drivers_autoprobe = 1;
 
 	retval = kset_register(&priv->subsys);
···
 	if (retval)
 		goto bus_uevent_fail;
 
-	priv->devices_kset = kset_create_and_add("devices", NULL,
-						 &priv->subsys.kobj);
+	priv->devices_kset = kset_create_and_add("devices", NULL, bus_kobj);
 	if (!priv->devices_kset) {
 		retval = -ENOMEM;
 		goto bus_devices_fail;
 	}
 
-	priv->drivers_kset = kset_create_and_add("drivers", NULL,
-						 &priv->subsys.kobj);
+	priv->drivers_kset = kset_create_and_add("drivers", NULL, bus_kobj);
 	if (!priv->drivers_kset) {
 		retval = -ENOMEM;
 		goto bus_drivers_fail;
 	}
 
 	INIT_LIST_HEAD(&priv->interfaces);
+	key = &priv->lock_key;
+	lockdep_register_key(key);
 	__mutex_init(&priv->mutex, "subsys mutex", key);
 	klist_init(&priv->klist_devices, klist_devices_get, klist_devices_put);
 	klist_init(&priv->klist_drivers, NULL, NULL);
···
 	if (retval)
 		goto bus_probe_files_fail;
 
-	retval = bus_add_groups(bus, bus->bus_groups);
+	retval = sysfs_create_groups(bus_kobj, bus->bus_groups);
 	if (retval)
 		goto bus_groups_fail;
 
···
 bus_groups_fail:
 	remove_probe_files(bus);
 bus_probe_files_fail:
-	kset_unregister(bus->p->drivers_kset);
+	kset_unregister(priv->drivers_kset);
 bus_drivers_fail:
-	kset_unregister(bus->p->devices_kset);
+	kset_unregister(priv->devices_kset);
 bus_devices_fail:
 	bus_remove_file(bus, &bus_attr_uevent);
 bus_uevent_fail:
-	kset_unregister(&bus->p->subsys);
+	kset_unregister(&priv->subsys);
 out:
-	kfree(bus->p);
-	bus->p = NULL;
+	kfree(priv);
 	return retval;
 }
 EXPORT_SYMBOL_GPL(bus_register);
···
  * Unregister the child subsystems and the bus itself.
  * Finally, we call bus_put() to release the refcount
  */
-void bus_unregister(struct bus_type *bus)
+void bus_unregister(const struct bus_type *bus)
 {
+	struct subsys_private *sp = bus_to_subsys(bus);
+	struct kobject *bus_kobj;
+
+	if (!sp)
+		return;
+
 	pr_debug("bus: '%s': unregistering\n", bus->name);
 	if (bus->dev_root)
 		device_unregister(bus->dev_root);
-	bus_remove_groups(bus, bus->bus_groups);
+
+	bus_kobj = &sp->subsys.kobj;
+	sysfs_remove_groups(bus_kobj, bus->bus_groups);
 	remove_probe_files(bus);
-	kset_unregister(bus->p->drivers_kset);
-	kset_unregister(bus->p->devices_kset);
 	bus_remove_file(bus, &bus_attr_uevent);
-	kset_unregister(&bus->p->subsys);
+
+	kset_unregister(sp->drivers_kset);
+	kset_unregister(sp->devices_kset);
+	kset_unregister(&sp->subsys);
+	subsys_put(sp);
 }
 EXPORT_SYMBOL_GPL(bus_unregister);
 
-int bus_register_notifier(struct bus_type *bus, struct notifier_block *nb)
+int bus_register_notifier(const struct bus_type *bus, struct notifier_block *nb)
 {
-	return blocking_notifier_chain_register(&bus->p->bus_notifier, nb);
+	struct subsys_private *sp = bus_to_subsys(bus);
+	int retval;
+
+	if (!sp)
+		return -EINVAL;
+
+	retval = blocking_notifier_chain_register(&sp->bus_notifier, nb);
+	subsys_put(sp);
+	return retval;
 }
 EXPORT_SYMBOL_GPL(bus_register_notifier);
 
-int bus_unregister_notifier(struct bus_type *bus, struct notifier_block *nb)
+int bus_unregister_notifier(const struct bus_type *bus, struct notifier_block *nb)
 {
-	return blocking_notifier_chain_unregister(&bus->p->bus_notifier, nb);
+	struct subsys_private *sp = bus_to_subsys(bus);
+	int retval;
+
+	if (!sp)
+		return -EINVAL;
+	retval = blocking_notifier_chain_unregister(&sp->bus_notifier, nb);
+	subsys_put(sp);
+	return retval;
 }
 EXPORT_SYMBOL_GPL(bus_unregister_notifier);
 
-struct kset *bus_get_kset(struct bus_type *bus)
+void bus_notify(struct device *dev, enum bus_notifier_event value)
 {
-	return &bus->p->subsys;
+	struct subsys_private *sp = bus_to_subsys(dev->bus);
+
+	if (!sp)
+		return;
+
+	blocking_notifier_call_chain(&sp->bus_notifier, value, dev);
+	subsys_put(sp);
+}
+
+struct kset *bus_get_kset(const struct bus_type *bus)
+{
+	struct subsys_private *sp = bus_to_subsys(bus);
+	struct kset *kset;
+
+	if (!sp)
+		return NULL;
+
+	kset = &sp->subsys;
+	subsys_put(sp);
+
+	return kset;
 }
 EXPORT_SYMBOL_GPL(bus_get_kset);
-
-struct klist *bus_get_device_klist(struct bus_type *bus)
-{
-	return &bus->p->klist_devices;
-}
-EXPORT_SYMBOL_GPL(bus_get_device_klist);
 
 /*
  * Yes, this forcibly breaks the klist abstraction temporarily.  It
···
 			   int (*compare)(const struct device *a,
 					  const struct device *b))
 {
+	struct subsys_private *sp = bus_to_subsys(bus);
 	LIST_HEAD(sorted_devices);
 	struct klist_node *n, *tmp;
 	struct device_private *dev_prv;
 	struct device *dev;
 	struct klist *device_klist;
 
-	device_klist = bus_get_device_klist(bus);
+	if (!sp)
+		return;
+	device_klist = &sp->klist_devices;
 
 	spin_lock(&device_klist->k_lock);
 	list_for_each_entry_safe(n, tmp, &device_klist->k_list, n_node) {
···
 	}
 	list_splice(&sorted_devices, &device_klist->k_list);
 	spin_unlock(&device_klist->k_lock);
+	subsys_put(sp);
 }
 EXPORT_SYMBOL_GPL(bus_sort_breadthfirst);
+
+struct subsys_dev_iter {
+	struct klist_iter		ki;
+	const struct device_type	*type;
+};
 
 /**
  * subsys_dev_iter_init - initialize subsys device iterator
  * @iter: subsys iterator to initialize
- * @subsys: the subsys we wanna iterate over
+ * @sp: the subsys private (i.e. bus) we wanna iterate over
  * @start: the device to start iterating from, if any
  * @type: device_type of the devices to iterate over, NULL for all
  *
···
  * otherwise if it is NULL, the iteration starts at the beginning of
  * the list.
  */
-void subsys_dev_iter_init(struct subsys_dev_iter *iter, struct bus_type *subsys,
-			  struct device *start, const struct device_type *type)
+static void subsys_dev_iter_init(struct subsys_dev_iter *iter, struct subsys_private *sp,
+				 struct device *start, const struct device_type *type)
 {
 	struct klist_node *start_knode = NULL;
 
 	if (start)
 		start_knode = &start->p->knode_bus;
-	klist_iter_init_node(&subsys->p->klist_devices, &iter->ki, start_knode);
+	klist_iter_init_node(&sp->klist_devices, &iter->ki, start_knode);
 	iter->type = type;
 }
-EXPORT_SYMBOL_GPL(subsys_dev_iter_init);
 
 /**
  * subsys_dev_iter_next - iterate to the next device
···
  * free to do whatever it wants to do with the device including
  * calling back into subsys code.
  */
-struct device *subsys_dev_iter_next(struct subsys_dev_iter *iter)
+static struct device *subsys_dev_iter_next(struct subsys_dev_iter *iter)
 {
 	struct klist_node *knode;
 	struct device *dev;
···
 			return dev;
 	}
 }
-EXPORT_SYMBOL_GPL(subsys_dev_iter_next);
 
 /**
  * subsys_dev_iter_exit - finish iteration
···
  * Finish an iteration.  Always call this function after iteration is
  * complete whether the iteration ran till the end or not.
  */
-void subsys_dev_iter_exit(struct subsys_dev_iter *iter)
+static void subsys_dev_iter_exit(struct subsys_dev_iter *iter)
 {
 	klist_iter_exit(&iter->ki);
 }
-EXPORT_SYMBOL_GPL(subsys_dev_iter_exit);
 
 int subsys_interface_register(struct subsys_interface *sif)
 {
-	struct bus_type *subsys;
+	struct subsys_private *sp;
 	struct subsys_dev_iter iter;
 	struct device *dev;
 
 	if (!sif || !sif->subsys)
 		return -ENODEV;
 
-	subsys = bus_get(sif->subsys);
-	if (!subsys)
+	sp = bus_to_subsys(sif->subsys);
+	if (!sp)
 		return -EINVAL;
 
-	mutex_lock(&subsys->p->mutex);
-	list_add_tail(&sif->node, &subsys->p->interfaces);
+	/*
+	 * Reference in sp is now incremented and will be dropped when
+	 * the interface is removed from the bus
+	 */
+
+	mutex_lock(&sp->mutex);
+	list_add_tail(&sif->node, &sp->interfaces);
 	if (sif->add_dev) {
-		subsys_dev_iter_init(&iter, subsys, NULL, NULL);
+		subsys_dev_iter_init(&iter, sp, NULL, NULL);
 		while ((dev = subsys_dev_iter_next(&iter)))
 			sif->add_dev(dev, sif);
 		subsys_dev_iter_exit(&iter);
 	}
-	mutex_unlock(&subsys->p->mutex);
+	mutex_unlock(&sp->mutex);
 
 	return 0;
 }
···
 
 void subsys_interface_unregister(struct subsys_interface *sif)
 {
-	struct bus_type *subsys;
+	struct subsys_private *sp;
 	struct subsys_dev_iter iter;
 	struct device *dev;
 
 	if (!sif || !sif->subsys)
 		return;
 
-	subsys = sif->subsys;
+	sp = bus_to_subsys(sif->subsys);
+	if (!sp)
+		return;
 
-	mutex_lock(&subsys->p->mutex);
+	mutex_lock(&sp->mutex);
 	list_del_init(&sif->node);
 	if (sif->remove_dev) {
-		subsys_dev_iter_init(&iter, subsys, NULL, NULL);
+		subsys_dev_iter_init(&iter, sp, NULL, NULL);
 		while ((dev = subsys_dev_iter_next(&iter)))
 			sif->remove_dev(dev, sif);
 		subsys_dev_iter_exit(&iter);
 	}
-	mutex_unlock(&subsys->p->mutex);
+	mutex_unlock(&sp->mutex);
 
-	bus_put(subsys);
+	/*
+	 * Decrement the reference count twice, once for the bus_to_subsys()
+	 * call in the start of this function, and the second one from the
+	 * reference increment in subsys_interface_register()
+	 */
+	subsys_put(sp);
+	subsys_put(sp);
 }
 EXPORT_SYMBOL_GPL(subsys_interface_unregister);
 
···
 	return subsys_register(subsys, groups, virtual_dir);
 }
 EXPORT_SYMBOL_GPL(subsys_virtual_register);
+
+/**
+ * driver_find - locate driver on a bus by its name.
+ * @name: name of the driver.
+ * @bus: bus to scan for the driver.
+ *
+ * Call kset_find_obj() to iterate over list of drivers on
+ * a bus to find driver by name. Return driver if found.
+ *
+ * This routine provides no locking to prevent the driver it returns
+ * from being unregistered or unloaded while the caller is using it.
+ * The caller is responsible for preventing this.
+ */
+struct device_driver *driver_find(const char *name, struct bus_type *bus)
+{
+	struct subsys_private *sp = bus_to_subsys(bus);
+	struct kobject *k;
+	struct driver_private *priv;
+
+	if (!sp)
+		return NULL;
+
+	k = kset_find_obj(sp->drivers_kset, name);
+	subsys_put(sp);
+	if (!k)
+		return NULL;
+
+	priv = to_driver(k);
+
+	/* Drop reference added by kset_find_obj() */
+	kobject_put(k);
+	return priv->driver;
+}
+EXPORT_SYMBOL_GPL(driver_find);
+
+/*
+ * Warning, the value could go to "removed" instantly after calling this function, so be very
+ * careful when calling it...
+ */
+bool bus_is_registered(const struct bus_type *bus)
+{
+	struct subsys_private *sp = bus_to_subsys(bus);
+	bool is_initialized = false;
+
+	if (sp) {
+		is_initialized = true;
+		subsys_put(sp);
+	}
+	return is_initialized;
+}
+
+/**
+ * bus_get_dev_root - return a pointer to the "device root" of a bus
+ * @bus: bus to return the device root of.
+ *
+ * If a bus has a "device root" structure, return it, WITH THE REFERENCE
+ * COUNT INCREMENTED.
+ *
+ * Note, when finished with the device, a call to put_device() is required.
+ *
+ * If the device root is not present (or bus is not a valid pointer), NULL
+ * will be returned.
+ */
+struct device *bus_get_dev_root(const struct bus_type *bus)
+{
+	if (bus)
+		return get_device(bus->dev_root);
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(bus_get_dev_root);
 
 int __init buses_init(void)
 {

drivers/base/cacheinfo.c

···
 
 	return 0;
 }
+
+static int of_count_cache_leaves(struct device_node *np)
+{
+	unsigned int leaves = 0;
+
+	if (of_property_read_bool(np, "cache-size"))
+		++leaves;
+	if (of_property_read_bool(np, "i-cache-size"))
+		++leaves;
+	if (of_property_read_bool(np, "d-cache-size"))
+		++leaves;
+
+	if (!leaves) {
+		/* The '[i-|d-|]cache-size' property is required, but
+		 * if absent, fallback on the 'cache-unified' property.
+		 */
+		if (of_property_read_bool(np, "cache-unified"))
+			return 1;
+		else
+			return 2;
+	}
+
+	return leaves;
+}
+
+int init_of_cache_level(unsigned int cpu)
+{
+	struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
+	struct device_node *np = of_cpu_device_node_get(cpu);
+	struct device_node *prev = NULL;
+	unsigned int levels = 0, leaves, level;
+
+	leaves = of_count_cache_leaves(np);
+	if (leaves > 0)
+		levels = 1;
+
+	prev = np;
+	while ((np = of_find_next_cache_node(np))) {
+		of_node_put(prev);
+		prev = np;
+		if (!of_device_is_compatible(np, "cache"))
+			goto err_out;
+		if (of_property_read_u32(np, "cache-level", &level))
+			goto err_out;
+		if (level <= levels)
+			goto err_out;
+
+		leaves += of_count_cache_leaves(np);
+		levels = level;
+	}
+
+	of_node_put(np);
+	this_cpu_ci->num_levels = levels;
+	this_cpu_ci->num_leaves = leaves;
+
+	return 0;
+
+err_out:
+	of_node_put(np);
+	return -EINVAL;
+}
+
 #else
 static inline int cache_setup_of_node(unsigned int cpu) { return 0; }
+int init_of_cache_level(unsigned int cpu) { return 0; }
 #endif
 
 int __weak cache_setup_acpi(unsigned int cpu)
···
 {
 	struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
 	struct cacheinfo *this_leaf, *sib_leaf;
-	unsigned int index;
+	unsigned int index, sib_index;
 	int ret = 0;
 
 	if (this_cpu_ci->cpu_map_populated)
···
 
 			if (i == cpu || !sib_cpu_ci->info_list)
 				continue;/* skip if itself or no cacheinfo */
-
-			sib_leaf = per_cpu_cacheinfo_idx(i, index);
-			if (cache_leaves_are_shared(this_leaf, sib_leaf)) {
-				cpumask_set_cpu(cpu, &sib_leaf->shared_cpu_map);
-				cpumask_set_cpu(i, &this_leaf->shared_cpu_map);
+			for (sib_index = 0; sib_index < cache_leaves(i); sib_index++) {
+				sib_leaf = per_cpu_cacheinfo_idx(i, sib_index);
+				if (cache_leaves_are_shared(this_leaf, sib_leaf)) {
+					cpumask_set_cpu(cpu, &sib_leaf->shared_cpu_map);
+					cpumask_set_cpu(i, &this_leaf->shared_cpu_map);
+					break;
+				}
 			}
 		}
 		/* record the maximum cache line size */
···
 static void cache_shared_cpu_map_remove(unsigned int cpu)
 {
 	struct cacheinfo *this_leaf, *sib_leaf;
-	unsigned int sibling, index;
+	unsigned int sibling, index, sib_index;
 
 	for (index = 0; index < cache_leaves(cpu); index++) {
 		this_leaf = per_cpu_cacheinfo_idx(cpu, index);
···
 			if (sibling == cpu || !sib_cpu_ci->info_list)
 				continue;/* skip if itself or no cacheinfo */
 
-			sib_leaf = per_cpu_cacheinfo_idx(sibling, index);
-			cpumask_clear_cpu(cpu, &sib_leaf->shared_cpu_map);
-			cpumask_clear_cpu(sibling, &this_leaf->shared_cpu_map);
+			for (sib_index = 0; sib_index < cache_leaves(sibling); sib_index++) {
+				sib_leaf = per_cpu_cacheinfo_idx(sibling, sib_index);
+				if (cache_leaves_are_shared(this_leaf, sib_leaf)) {
+					cpumask_clear_cpu(cpu, &sib_leaf->shared_cpu_map);
+					cpumask_clear_cpu(sibling, &this_leaf->shared_cpu_map);
+					break;
+				}
+			}
 		}
 	}
 }
···
 		return;
 
 	cache_shared_cpu_map_remove(cpu);
-
-	kfree(per_cpu_cacheinfo(cpu));
-	per_cpu_cacheinfo(cpu) = NULL;
-	cache_leaves(cpu) = 0;
 }
 
 int __weak init_cache_level(unsigned int cpu)
···
 	return -ENOENT;
 }
 
-int detect_cache_attributes(unsigned int cpu)
+static inline
+int allocate_cache_info(int cpu)
 {
-	int ret;
-
-	/* Since early detection of the cacheinfo is allowed via this
-	 * function and this also gets called as CPU hotplug callbacks via
-	 * cacheinfo_cpu_online, the initialisation can be skipped and only
-	 * CPU maps can be updated as the CPU online status would be update
-	 * if called via cacheinfo_cpu_online path.
-	 */
-	if (per_cpu_cacheinfo(cpu))
-		goto update_cpu_map;
-
-	if (init_cache_level(cpu) || !cache_leaves(cpu))
-		return -ENOENT;
-
 	per_cpu_cacheinfo(cpu) = kcalloc(cache_leaves(cpu),
 					 sizeof(struct cacheinfo), GFP_ATOMIC);
-	if (per_cpu_cacheinfo(cpu) == NULL) {
+	if (!per_cpu_cacheinfo(cpu)) {
 		cache_leaves(cpu) = 0;
 		return -ENOMEM;
 	}
 
+	return 0;
+}
+
+int fetch_cache_info(unsigned int cpu)
+{
+	struct cpu_cacheinfo *this_cpu_ci;
+	unsigned int levels = 0, split_levels = 0;
+	int ret;
+
+	if (acpi_disabled) {
+		ret = init_of_cache_level(cpu);
+		if (ret < 0)
+			return ret;
+	} else {
+		ret = acpi_get_cache_info(cpu, &levels, &split_levels);
+		if (ret < 0)
+			return ret;
+
+		this_cpu_ci = get_cpu_cacheinfo(cpu);
+		this_cpu_ci->num_levels = levels;
+		/*
+		 * This assumes that:
+		 * - there cannot be any split caches (data/instruction)
+		 *   above a unified cache
+		 * - data/instruction caches come by pair
+		 */
+		this_cpu_ci->num_leaves = levels + split_levels;
+	}
+	if (!cache_leaves(cpu))
+		return -ENOENT;
+
+	return allocate_cache_info(cpu);
+}
+
+int detect_cache_attributes(unsigned int cpu)
+{
+	int ret;
+
+	/* Since early initialization/allocation of the cacheinfo is allowed
+	 * via fetch_cache_info() and this also gets called as CPU hotplug
+	 * callbacks via cacheinfo_cpu_online, the init/alloc can be skipped
+	 * as it will happen only once (the cacheinfo memory is never freed).
+	 * Just populate the cacheinfo.
+	 */
+	if (per_cpu_cacheinfo(cpu))
+		goto populate_leaves;
+
+	if (init_cache_level(cpu) || !cache_leaves(cpu))
+		return -ENOENT;
+
+	ret = allocate_cache_info(cpu);
+	if (ret)
+		return ret;
+
+populate_leaves:
 	/*
 	 * populate_cache_leaves() may completely setup the cache leaves and
 	 * shared_cpu_map or it may leave it partially setup.
···
 	if (ret)
 		goto free_ci;
 
-update_cpu_map:
 	/*
 	 * For systems using DT for cache hierarchy, fw_token
 	 * and shared_cpu_map will be set up here only if they are

drivers/base/class.c

···
 
 	pr_debug("class '%s': release.\n", class->name);
 
+	class->p = NULL;
+
 	if (class->class_release)
 		class->class_release(class);
 	else
···
 
 static const struct kobj_ns_type_operations *class_child_ns_type(const struct kobject *kobj)
 {
-	struct subsys_private *cp = to_subsys_private(kobj);
+	const struct subsys_private *cp = to_subsys_private(kobj);
 	struct class *class = cp->class;
 
 	return class->ns_type;
···
 	.store	   = class_attr_store,
 };
 
-static struct kobj_type class_ktype = {
+static const struct kobj_type class_ktype = {
 	.sysfs_ops	= &class_sysfs_ops,
 	.release	= class_release,
 	.child_ns_type	= class_child_ns_type,
···
 		error = -EINVAL;
 	return error;
 }
+EXPORT_SYMBOL_GPL(class_create_file_ns);
 
 void class_remove_file_ns(struct class *cls, const struct class_attribute *attr,
 			  const void *ns)
···
 	if (cls)
 		sysfs_remove_file_ns(&cls->p->subsys.kobj, &attr->attr, ns);
 }
+EXPORT_SYMBOL_GPL(class_remove_file_ns);
 
 static struct class *class_get(struct class *cls)
 {
···
 	cls->p = cp;
 
 	error = kset_register(&cp->subsys);
-	if (error) {
-		kfree(cp);
-		return error;
-	}
+	if (error)
+		goto err_out;
+
 	error = class_add_groups(class_get(cls), cls->class_groups);
 	class_put(cls);
 	if (error) {
 		kobject_del(&cp->subsys.kobj);
 		kfree_const(cp->subsys.kobj.name);
-		kfree(cp);
+		goto err_out;
 	}
+	return 0;
+
+err_out:
+	kfree(cp);
+	cls->p = NULL;
 	return error;
 }
 EXPORT_SYMBOL_GPL(__class_register);
···
 	class_remove_groups(cls, cls->class_groups);
 	kset_unregister(&cls->p->subsys);
 }
+EXPORT_SYMBOL_GPL(class_unregister);
 
 static void class_create_release(struct class *cls)
 {
···
 
 	class_unregister(cls);
 }
+EXPORT_SYMBOL_GPL(class_destroy);
 
 /**
  * class_dev_iter_init - initialize class device iterator
···
 
 	return 0;
 }
+EXPORT_SYMBOL_GPL(class_interface_register);
 
 void class_interface_unregister(struct class_interface *class_intf)
 {
···
 
 	class_put(parent);
 }
+EXPORT_SYMBOL_GPL(class_interface_unregister);
 
 ssize_t show_class_attr_string(struct class *class,
 			       struct class_attribute *attr, char *buf)
···
 		return -ENOMEM;
 	return 0;
 }
-
-EXPORT_SYMBOL_GPL(class_create_file_ns);
-EXPORT_SYMBOL_GPL(class_remove_file_ns);
-EXPORT_SYMBOL_GPL(class_unregister);
-EXPORT_SYMBOL_GPL(class_destroy);
-
-EXPORT_SYMBOL_GPL(class_interface_register);
-EXPORT_SYMBOL_GPL(class_interface_unregister);

drivers/base/component.c

···
 
 static void component_debugfs_del(struct aggregate_device *m)
 {
-	debugfs_remove(debugfs_lookup(dev_name(m->parent), component_debugfs_dir));
+	debugfs_lookup_and_remove(dev_name(m->parent), component_debugfs_dir);
 }
 
 #else

drivers/base/core.c

···
 static unsigned int defer_sync_state_count = 1;
 static DEFINE_MUTEX(fwnode_link_lock);
 static bool fw_devlink_is_permissive(void);
+static void __fw_devlink_link_to_consumers(struct device *dev);
 static bool fw_devlink_drv_reg_done;
 static bool fw_devlink_best_effort;
 
 /**
- * fwnode_link_add - Create a link between two fwnode_handles.
+ * __fwnode_link_add - Create a link between two fwnode_handles.
  * @con: Consumer end of the link.
  * @sup: Supplier end of the link.
  *
···
  * Attempts to create duplicate links between the same pair of fwnode handles
  * are ignored and there is no reference counting.
  */
-int fwnode_link_add(struct fwnode_handle *con, struct fwnode_handle *sup)
+static int __fwnode_link_add(struct fwnode_handle *con,
+			     struct fwnode_handle *sup, u8 flags)
 {
 	struct fwnode_link *link;
-	int ret = 0;
-
-	mutex_lock(&fwnode_link_lock);
 
 	list_for_each_entry(link, &sup->consumers, s_hook)
-		if (link->consumer == con)
-			goto out;
+		if (link->consumer == con) {
+			link->flags |= flags;
+			return 0;
+		}
 
 	link = kzalloc(sizeof(*link), GFP_KERNEL);
-	if (!link) {
-		ret = -ENOMEM;
-		goto out;
-	}
+	if (!link)
+		return -ENOMEM;
 
 	link->supplier = sup;
 	INIT_LIST_HEAD(&link->s_hook);
 	link->consumer = con;
 	INIT_LIST_HEAD(&link->c_hook);
+	link->flags = flags;
 
 	list_add(&link->s_hook, &sup->consumers);
 	list_add(&link->c_hook, &con->suppliers);
 	pr_debug("%pfwP Linked as a fwnode consumer to %pfwP\n",
 		 con, sup);
-out:
-	mutex_unlock(&fwnode_link_lock);
 
+	return 0;
+}
+
+int fwnode_link_add(struct fwnode_handle *con, struct fwnode_handle *sup)
+{
+	int ret;
+
+	mutex_lock(&fwnode_link_lock);
+	ret = __fwnode_link_add(con, sup, 0);
+	mutex_unlock(&fwnode_link_lock);
 	return ret;
 }
 
···
 	list_del(&link->s_hook);
 	list_del(&link->c_hook);
 	kfree(link);
+}
+
+/**
+ * __fwnode_link_cycle - Mark a fwnode link as being part of a cycle.
+ * @link: the fwnode_link to be marked
+ *
+ * The fwnode_link_lock needs to be held when this function is called.
+ */
+static void __fwnode_link_cycle(struct fwnode_link *link)
+{
+	pr_debug("%pfwf: Relaxing link with %pfwf\n",
+		 link->consumer, link->supplier);
+	link->flags |= FWLINK_FLAG_CYCLE;
 }
 
 /**
···
 }
 EXPORT_SYMBOL_GPL(fw_devlink_purge_absent_suppliers);
 
+/**
+ * __fwnode_links_move_consumers - Move consumer from @from to @to fwnode_handle
+ * @from: move consumers away from this fwnode
+ * @to: move consumers to this fwnode
+ *
+ * Move all consumer links from @from fwnode to @to fwnode.
+ */
+static void __fwnode_links_move_consumers(struct fwnode_handle *from,
+					  struct fwnode_handle *to)
+{
+	struct fwnode_link *link, *tmp;
+
+	list_for_each_entry_safe(link, tmp, &from->consumers, s_hook) {
+		__fwnode_link_add(link->consumer, to, link->flags);
+		__fwnode_link_del(link);
+	}
+}
+
+/**
+ * __fw_devlink_pickup_dangling_consumers - Pick up dangling consumers
+ * @fwnode: fwnode from which to pick up dangling consumers
+ * @new_sup: fwnode of new supplier
+ *
+ * If the @fwnode has a corresponding struct device and the device supports
+ * probing (that is, added to a bus), then we want to let fw_devlink create
+ * MANAGED device links to this device, so leave @fwnode and its descendant's
+ * fwnode links alone.
+ *
+ * Otherwise, move its consumers to the new supplier @new_sup.
+ */
+static void __fw_devlink_pickup_dangling_consumers(struct fwnode_handle *fwnode,
+						   struct fwnode_handle *new_sup)
+{
+	struct fwnode_handle *child;
+
+	if (fwnode->dev && fwnode->dev->bus)
+		return;
+
+	fwnode->flags |= FWNODE_FLAG_NOT_DEVICE;
+	__fwnode_links_move_consumers(fwnode, new_sup);
+
+	fwnode_for_each_available_child_node(fwnode, child)
+		__fw_devlink_pickup_dangling_consumers(child, new_sup);
+}
+
 static DEFINE_MUTEX(device_links_lock);
 DEFINE_STATIC_SRCU(device_links_srcu);
 
···
 	return false;
 }
 
+static inline bool device_link_flag_is_sync_state_only(u32 flags)
+{
+	return (flags & ~(DL_FLAG_INFERRED | DL_FLAG_CYCLE)) ==
+		(DL_FLAG_SYNC_STATE_ONLY | DL_FLAG_MANAGED);
+}
+
 /**
  * device_is_dependent - Check if one device depends on another one
  * @dev: Device to check dependencies for.
···
 		return ret;
 
 	list_for_each_entry(link, &dev->links.consumers, s_node) {
-		if ((link->flags & ~DL_FLAG_INFERRED) ==
-		    (DL_FLAG_SYNC_STATE_ONLY | DL_FLAG_MANAGED))
+		if (device_link_flag_is_sync_state_only(link->flags))
 			continue;
 
 		if (link->consumer == target)
···
 
 	device_for_each_child(dev, NULL, device_reorder_to_tail);
 	list_for_each_entry(link, &dev->links.consumers, s_node) {
-		if ((link->flags & ~DL_FLAG_INFERRED) ==
-		    (DL_FLAG_SYNC_STATE_ONLY | DL_FLAG_MANAGED))
+		if (device_link_flag_is_sync_state_only(link->flags))
 			continue;
 		device_reorder_to_tail(link->consumer, NULL);
 	}
···
 			       DL_FLAG_AUTOREMOVE_SUPPLIER | \
 			       DL_FLAG_AUTOPROBE_CONSUMER  | \
 			       DL_FLAG_SYNC_STATE_ONLY | \
-			       DL_FLAG_INFERRED)
+			       DL_FLAG_INFERRED | \
+			       DL_FLAG_CYCLE)
 
 #define DL_ADD_VALID_FLAGS (DL_MANAGED_LINK_FLAGS | DL_FLAG_STATELESS | \
 			    DL_FLAG_PM_RUNTIME | DL_FLAG_RPM_ACTIVE)
···
 	if (!consumer || !supplier || consumer == supplier ||
 	    flags & ~DL_ADD_VALID_FLAGS ||
 	    (flags & DL_FLAG_STATELESS && flags & DL_MANAGED_LINK_FLAGS) ||
-	    (flags & DL_FLAG_SYNC_STATE_ONLY &&
-	     (flags & ~DL_FLAG_INFERRED) != DL_FLAG_SYNC_STATE_ONLY) ||
 	    (flags & DL_FLAG_AUTOPROBE_CONSUMER &&
 	     flags & (DL_FLAG_AUTOREMOVE_CONSUMER |
 		      DL_FLAG_AUTOREMOVE_SUPPLIER)))
···
 
 	if (!(flags & DL_FLAG_STATELESS))
 		flags |= DL_FLAG_MANAGED;
+
+	if (flags & DL_FLAG_SYNC_STATE_ONLY &&
+	    !device_link_flag_is_sync_state_only(flags))
+		return NULL;
 
 	device_links_write_lock();
 	device_pm_lock();
···
 		(dev->fwnode && (dev->fwnode->flags & FWNODE_FLAG_BEST_EFFORT));
 }
 
+static struct fwnode_handle *fwnode_links_check_suppliers(
+						struct fwnode_handle *fwnode)
+{
+	struct fwnode_link *link;
+
+	if (!fwnode || fw_devlink_is_permissive())
+		return NULL;
+
+	list_for_each_entry(link, &fwnode->suppliers, c_hook)
+		if (!(link->flags & FWLINK_FLAG_CYCLE))
+			return link->supplier;
+
+	return NULL;
+}
+
 /**
  * device_links_check_suppliers - Check presence of supplier drivers.
  * @dev: Consumer device.
···
 	 * probe.
 	 */
 	mutex_lock(&fwnode_link_lock);
-	if (dev->fwnode && !list_empty(&dev->fwnode->suppliers) &&
-	    !fw_devlink_is_permissive()) {
-		sup_fw = list_first_entry(&dev->fwnode->suppliers,
-					  struct fwnode_link,
-					  c_hook)->supplier;
+	sup_fw = fwnode_links_check_suppliers(dev->fwnode);
+	if (sup_fw) {
 		if (!dev_is_best_effort(dev)) {
 			fwnode_ret = -EPROBE_DEFER;
 			dev_err_probe(dev, -EPROBE_DEFER,
···
 	bool val;
 
 	device_lock(dev);
-	val = !list_empty(&dev->fwnode->suppliers);
+	mutex_lock(&fwnode_link_lock);
+	val = !!fwnode_links_check_suppliers(dev->fwnode);
+	mutex_unlock(&fwnode_link_lock);
 	device_unlock(dev);
 	return sysfs_emit(buf, "%u\n", val);
 }
···
 	 * them. So, fw_devlink no longer needs to create device links to any
 	 * of the device's suppliers.
 	 *
-	 * Also, if a child firmware node of this bound device is not added as
-	 * a device by now, assume it is never going to be added and make sure
-	 * other devices don't defer probe indefinitely by waiting for such a
-	 * child device.
+	 * Also, if a child firmware node of this bound device is not added as a
+	 * device by now, assume it is never going to be added. Make this bound
+	 * device the fallback supplier to the dangling consumers of the child
+	 * firmware node because this bound device is probably implementing the
+	 * child firmware node functionality and we don't want the dangling
+	 * consumers to defer probe indefinitely waiting for a device for the
+	 * child firmware node.
 	 */
 	if (dev->fwnode && dev->fwnode->dev == dev) {
 		struct fwnode_handle *child;
 		fwnode_links_purge_suppliers(dev->fwnode);
+		mutex_lock(&fwnode_link_lock);
 		fwnode_for_each_available_child_node(dev->fwnode, child)
-			fw_devlink_purge_absent_suppliers(child);
+			__fw_devlink_pickup_dangling_consumers(child,
+							       dev->fwnode);
+		__fw_devlink_link_to_consumers(dev);
+		mutex_unlock(&fwnode_link_lock);
 	}
 	device_remove_file(dev, &dev_attr_waiting_for_supplier);
 
···
 }
 early_param("fw_devlink.strict", fw_devlink_strict_setup);
 
-u32 fw_devlink_get_flags(void)
+static inline u32 fw_devlink_get_flags(u8 fwlink_flags)
 {
+	if (fwlink_flags & FWLINK_FLAG_CYCLE)
+		return FW_DEVLINK_FLAGS_PERMISSIVE | DL_FLAG_CYCLE;
+
 	return fw_devlink_flags;
 }
 
···
 	if (!(link->flags & DL_FLAG_INFERRED))
 		return;
 
-	if (link->flags == (DL_FLAG_MANAGED | FW_DEVLINK_FLAGS_PERMISSIVE))
+	if (device_link_flag_is_sync_state_only(link->flags))
 		return;
 
 	pm_runtime_drop_link(link);
···
 	device_links_write_unlock();
 }
 
-/**
- * fw_devlink_relax_cycle - Convert cyclic links to SYNC_STATE_ONLY links
- * @con: Device to check dependencies for.
- * @sup: Device to check against.
- *
- * Check if @sup depends on @con or any device dependent on it (its child or
- * its consumer etc).  When such a cyclic dependency is found, convert all
- * device links created solely by fw_devlink into SYNC_STATE_ONLY device links.
- * This is the equivalent of doing fw_devlink=permissive just between the
- * devices in the cycle. We need to do this because, at this point, fw_devlink
- * can't tell which of these dependencies is not a real dependency.
- *
- * Return 1 if a cycle is found. Otherwise, return 0.
- */
-static int fw_devlink_relax_cycle(struct device *con, void *sup)
+
+static bool fwnode_init_without_drv(struct fwnode_handle *fwnode)
 {
-	struct device_link *link;
-	int ret;
+	struct device *dev;
+	bool ret;
 
-	if (con == sup)
-		return 1;
+	if (!(fwnode->flags & FWNODE_FLAG_INITIALIZED))
+		return false;
 
-	ret = device_for_each_child(con, sup, fw_devlink_relax_cycle);
-	if (ret)
-		return ret;
+	dev = get_dev_from_fwnode(fwnode);
+	ret = !dev || dev->links.status == DL_DEV_NO_DRIVER;
+	put_device(dev);
 
-	list_for_each_entry(link, &con->links.consumers, s_node) {
-		if ((link->flags & ~DL_FLAG_INFERRED) ==
-		    (DL_FLAG_SYNC_STATE_ONLY | DL_FLAG_MANAGED))
-			continue;
+	return ret;
+}
 
-		if (!fw_devlink_relax_cycle(link->consumer, sup))
-			continue;
+static bool fwnode_ancestor_init_without_drv(struct fwnode_handle *fwnode)
+{
+	struct fwnode_handle *parent;
 
-		ret = 1;
-
-		fw_devlink_relax_link(link);
+	fwnode_for_each_parent_node(fwnode, parent) {
+		if (fwnode_init_without_drv(parent)) {
+			fwnode_handle_put(parent);
+			return true;
+		}
 	}
+
+	return false;
+}
+
+/**
+ * __fw_devlink_relax_cycles - Relax and mark dependency cycles.
+ * @con: Potential consumer device.
+ * @sup_handle: Potential supplier's fwnode.
+ *
+ * Needs to be called with fwnode_lock and device link lock held.
+ *
+ * Check if @sup_handle or any of its ancestors or suppliers direct/indirectly
+ * depend on @con. This function can detect multiple cyles between @sup_handle
+ * and @con. When such dependency cycles are found, convert all device links
+ * created solely by fw_devlink into SYNC_STATE_ONLY device links. Also, mark
+ * all fwnode links in the cycle with FWLINK_FLAG_CYCLE so that when they are
+ * converted into a device link in the future, they are created as
+ * SYNC_STATE_ONLY device links. This is the equivalent of doing
+ * fw_devlink=permissive just between the devices in the cycle. We need to do
+ * this because, at this point, fw_devlink can't tell which of these
+ * dependencies is not a real dependency.
+ *
+ * Return true if one or more cycles were found. Otherwise, return false.
+ */
+static bool __fw_devlink_relax_cycles(struct device *con,
+				 struct fwnode_handle *sup_handle)
+{
+	struct device *sup_dev = NULL, *par_dev = NULL;
+	struct fwnode_link *link;
+	struct device_link *dev_link;
+	bool ret = false;
+
+	if (!sup_handle)
+		return false;
+
+	/*
+	 * We aren't trying to find all cycles. Just a cycle between con and
+	 * sup_handle.
+	 */
+	if (sup_handle->flags & FWNODE_FLAG_VISITED)
+		return false;
+
+	sup_handle->flags |= FWNODE_FLAG_VISITED;
+
+	sup_dev = get_dev_from_fwnode(sup_handle);
+
+	/* Termination condition. */
+	if (sup_dev == con) {
+		ret = true;
+		goto out;
+	}
+
+	/*
+	 * If sup_dev is bound to a driver and @con hasn't started binding to a
+	 * driver, sup_dev can't be a consumer of @con. So, no need to check
+	 * further.
+	 */
+	if (sup_dev && sup_dev->links.status ==  DL_DEV_DRIVER_BOUND &&
+	    con->links.status == DL_DEV_NO_DRIVER) {
+		ret = false;
+		goto out;
+	}
+
+	list_for_each_entry(link, &sup_handle->suppliers, c_hook) {
+		if (__fw_devlink_relax_cycles(con, link->supplier)) {
+			__fwnode_link_cycle(link);
+			ret = true;
+		}
+	}
+
+	/*
+	 * Give priority to device parent over fwnode parent to account for any
+	 * quirks in how fwnodes are converted to devices.
+	 */
+	if (sup_dev)
+		par_dev = get_device(sup_dev->parent);
+	else
+		par_dev = fwnode_get_next_parent_dev(sup_handle);
+
+	if (par_dev && __fw_devlink_relax_cycles(con, par_dev->fwnode))
+		ret = true;
+
+	if (!sup_dev)
+		goto out;
+
+	list_for_each_entry(dev_link, &sup_dev->links.suppliers, c_node) {
+		/*
+		 * Ignore a SYNC_STATE_ONLY flag only if it wasn't marked as
+		 * such due to a cycle.
+		 */
+		if (device_link_flag_is_sync_state_only(dev_link->flags) &&
+		    !(dev_link->flags & DL_FLAG_CYCLE))
+			continue;
+
+		if (__fw_devlink_relax_cycles(con,
+					      dev_link->supplier->fwnode)) {
+			fw_devlink_relax_link(dev_link);
+			dev_link->flags |= DL_FLAG_CYCLE;
+			ret = true;
+		}
+	}
+
+out:
+	sup_handle->flags &= ~FWNODE_FLAG_VISITED;
+	put_device(sup_dev);
+	put_device(par_dev);
 	return ret;
 }
 
···
  * fw_devlink_create_devlink - Create a device link from a consumer to fwnode
  * @con: consumer device for the device link
  * @sup_handle: fwnode handle of supplier
- * @flags: devlink flags
+ * @link: fwnode link that's being converted to a device link
  *
  * This function will try to create a device link between the consumer device
  * @con and the supplier device represented by @sup_handle.
···
  *  possible to do that in the future
  */
 static int fw_devlink_create_devlink(struct device *con,
-				     struct fwnode_handle *sup_handle, u32 flags)
+				     struct fwnode_handle *sup_handle,
+				     struct fwnode_link *link)
 {
 	struct device *sup_dev;
 	int ret = 0;
+	u32 flags;
+
+	if (con->fwnode == link->consumer)
+		flags = fw_devlink_get_flags(link->flags);
+	else
+		flags = FW_DEVLINK_FLAGS_PERMISSIVE;
 
 	/*
 	 * In some cases, a device P might also be a supplier to its child node
···
 	    fwnode_is_ancestor_of(sup_handle, con->fwnode))
 		return -EINVAL;
 
-	sup_dev = get_dev_from_fwnode(sup_handle);
+	/*
+	 * SYNC_STATE_ONLY device links don't block probing and supports cycles.
+	 * So cycle detection isn't necessary and shouldn't be done.
+	 */
+	if (!(flags & DL_FLAG_SYNC_STATE_ONLY)) {
+		device_links_write_lock();
+		if (__fw_devlink_relax_cycles(con, sup_handle)) {
+			__fwnode_link_cycle(link);
+			flags = fw_devlink_get_flags(link->flags);
+			dev_info(con, "Fixed dependency cycle(s) with %pfwf\n",
+				 sup_handle);
+		}
+		device_links_write_unlock();
+	}
+
+	if (sup_handle->flags & FWNODE_FLAG_NOT_DEVICE)
+		sup_dev = fwnode_get_next_parent_dev(sup_handle);
+	else
+		sup_dev = get_dev_from_fwnode(sup_handle);
+
 	if (sup_dev) {
 		/*
 		 * If it's one of those drivers that don't actually bind to
···
 		 */
 		if (sup_dev->links.status == DL_DEV_NO_DRIVER &&
 		    sup_handle->flags & FWNODE_FLAG_INITIALIZED) {
+			dev_dbg(con,
+				"Not linking %pfwf - dev might never probe\n",
+				sup_handle);
 			ret = -EINVAL;
 			goto out;
 		}
 
-		/*
-		 * If this fails, it is due to cycles in device links.  Just
-		 * give up on this link and treat it as invalid.
-		 */
-		if (!device_link_add(con, sup_dev, flags) &&
-		    !(flags & DL_FLAG_SYNC_STATE_ONLY)) {
-			dev_info(con, "Fixing up cyclic dependency with %s\n",
-				 dev_name(sup_dev));
-			device_links_write_lock();
-			fw_devlink_relax_cycle(con, sup_dev);
-			device_links_write_unlock();
-			device_link_add(con, sup_dev,
-					FW_DEVLINK_FLAGS_PERMISSIVE);
+		if (!device_link_add(con, sup_dev, flags)) {
+			dev_err(con, "Failed to create device link with %s\n",
+				dev_name(sup_dev));
 			ret = -EINVAL;
 		}
 
 		goto out;
 	}
 
-	/* Supplier that's already initialized without a struct device. */
-	if (sup_handle->flags & FWNODE_FLAG_INITIALIZED)
+	/*
+	 * Supplier or supplier's ancestor already initialized without a struct
+	 * device or being probed by a driver.
+	 */
+	if (fwnode_init_without_drv(sup_handle) ||
+	    fwnode_ancestor_init_without_drv(sup_handle)) {
+		dev_dbg(con, "Not linking %pfwf - might never become dev\n",
+			sup_handle);
 		return -EINVAL;
-
-	/*
-	 * DL_FLAG_SYNC_STATE_ONLY doesn't block probing and supports
-	 * cycles. So cycle detection isn't necessary and shouldn't be
-	 * done.
-	 */
-	if (flags & DL_FLAG_SYNC_STATE_ONLY)
-		return -EAGAIN;
-
-	/*
-	 * If we can't find the supplier device from its fwnode, it might be
-	 * due to a cyclic dependency between fwnodes. Some of these cycles can
-	 * be broken by applying logic. Check for these types of cycles and
-	 * break them so that devices in the cycle probe properly.
-	 *
-	 * If the supplier's parent is dependent on the consumer, then the
-	 * consumer and supplier have a cyclic dependency. Since fw_devlink
-	 * can't tell which of the inferred dependencies are incorrect, don't
-	 * enforce probe ordering between any of the devices in this cyclic
-	 * dependency. Do this by relaxing all the fw_devlink device links in
-	 * this cycle and by treating the fwnode link between the consumer and
-	 * the supplier as an invalid dependency.
-	 */
-	sup_dev = fwnode_get_next_parent_dev(sup_handle);
-	if (sup_dev && device_is_dependent(con, sup_dev)) {
-		dev_info(con, "Fixing up cyclic dependency with %pfwP (%s)\n",
-			 sup_handle, dev_name(sup_dev));
-		device_links_write_lock();
-		fw_devlink_relax_cycle(con, sup_dev);
-		device_links_write_unlock();
-		ret = -EINVAL;
-	} else {
-		/*
-		 * Can't check for cycles or no cycles. So let's try
-		 * again later.
-		 */
-		ret = -EAGAIN;
 	}
 
+	ret = -EAGAIN;
 out:
 	put_device(sup_dev);
 	return ret;
···
 	struct fwnode_link *link, *tmp;
 
 	list_for_each_entry_safe(link, tmp, &fwnode->consumers, s_hook) {
-		u32 dl_flags = fw_devlink_get_flags();
 		struct device *con_dev;
 		bool own_link = true;
 		int ret;
···
 				con_dev = NULL;
 			} else {
 				own_link = false;
-				dl_flags = FW_DEVLINK_FLAGS_PERMISSIVE;
 			}
 		}
 
 		if (!con_dev)
 			continue;
 
-		ret = fw_devlink_create_devlink(con_dev, fwnode, dl_flags);
+		ret = fw_devlink_create_devlink(con_dev, fwnode, link);
 		put_device(con_dev);
 		if (!own_link || ret == -EAGAIN)
 			continue;
···
  *
  * The function creates normal (non-SYNC_STATE_ONLY) device links between @dev
  * and the real suppliers of @dev. Once these device links are created, the
- * fwnode links are deleted. When such device links are successfully created,
- * this function is called recursively on those supplier devices. This is
- * needed to detect and break some invalid cycles in fwnode links.  See
- * fw_devlink_create_devlink() for more details.
+ * fwnode links are deleted.
  *
  * In addition, it also looks at all the suppliers of the entire fwnode tree
  * because some of the child devices of @dev that have not been added yet
···
 	bool own_link = (dev->fwnode == fwnode);
 	struct fwnode_link *link, *tmp;
 	struct fwnode_handle *child = NULL;
-	u32 dl_flags;
-
-	if (own_link)
-		dl_flags = fw_devlink_get_flags();
-	else
-		dl_flags = FW_DEVLINK_FLAGS_PERMISSIVE;
 
 	list_for_each_entry_safe(link, tmp, &fwnode->suppliers, c_hook) {
 		int ret;
-		struct device *sup_dev;
 		struct fwnode_handle *sup = link->supplier;
 
-		ret = fw_devlink_create_devlink(dev, sup, dl_flags);
+		ret = fw_devlink_create_devlink(dev, sup, link);
 		if (!own_link || ret == -EAGAIN)
 			continue;
 
 		__fwnode_link_del(link);
-
-		/* If no device link was created, nothing more to do. */
-		if (ret)
-			continue;
-
-		/*
-		 * If a device link was successfully created to a supplier, we
-		 * now need to try and link the supplier to all its suppliers.
-		 *
-		 * This is needed to detect and delete false dependencies in
-		 * fwnode links that haven't been converted to a device link
-		 * yet. See comments in fw_devlink_create_devlink() for more
-		 * details on the false dependency.
-		 *
-		 * Without deleting these false dependencies, some devices will
-		 * never probe because they'll keep waiting for their false
-		 * dependency fwnode links to be converted to device links.
-		 */
-		sup_dev = get_dev_from_fwnode(sup);
-		__fw_devlink_link_to_suppliers(sup_dev, sup_dev->fwnode);
-		put_device(sup_dev);
 	}
 
 	/*
···
 		dev->class->get_ownership(dev, uid, gid);
 }
 
-static struct kobj_type device_ktype = {
+static const struct kobj_type device_ktype = {
 	.release	= device_release,
 	.sysfs_ops	= &dev_sysfs_ops,
 	.namespace	= device_namespace,
···
 	return NULL;
 }
 
-static int dev_uevent(struct kobject *kobj, struct kobj_uevent_env *env)
+static int dev_uevent(const struct kobject *kobj, struct kobj_uevent_env *env)
 {
-	struct device *dev = kobj_to_dev(kobj);
+	const struct device *dev = kobj_to_dev(kobj);
 	int retval = 0;
 
 	/* add device node properties if present */
···
 	return dir->class->ns_type;
 }
 
-static struct kobj_type class_dir_ktype = {
+static const struct kobj_type class_dir_ktype = {
 	.release	= class_dir_release,
 	.sysfs_ops	= &kobj_sysfs_ops,
 	.child_ns_type	= class_dir_child_ns_type
···
 static struct kobject *get_device_parent(struct device *dev,
 					 struct device *parent)
 {
+	struct kobject *kobj = NULL;
+
 	if (dev->class) {
-		struct kobject *kobj = NULL;
 		struct kobject *parent_kobj;
 		struct kobject *k;
 
···
 	}
 
 	/* subsystems can specify a default root directory for their devices */
-	if (!parent && dev->bus && dev->bus->dev_root)
-		return &dev->bus->dev_root->kobj;
+	if (!parent && dev->bus) {
+		struct device *dev_root = bus_get_dev_root(dev->bus);
+
+		if (dev_root) {
+			kobj = &dev_root->kobj;
+			put_device(dev_root);
+			return kobj;
+		}
+	}
 
 	if (parent)
 		return &parent->kobj;
···
 	/* we require the name to be set before, and pass NULL */
 	error = kobject_add(&dev->kobj, dev->kobj.parent, NULL);
 	if (error) {
-		glue_dir = get_glue_dir(dev);
+		glue_dir = kobj;
 		goto Error;
 	}
 
···
 	/* Notify clients of device addition.  This call must come
 	 * after dpm_sysfs_add() and before kobject_uevent().
 	 */
-	if (dev->bus)
-		blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
-					     BUS_NOTIFY_ADD_DEVICE, dev);
-
+	bus_notify(dev, BUS_NOTIFY_ADD_DEVICE);
 	kobject_uevent(&dev->kobj, KOBJ_ADD);
 
 	/*
···
 	device_pm_remove(dev);
 	dpm_sysfs_remove(dev);
  DPMError:
+	dev->driver = NULL;
 	bus_remove_device(dev);
  BusError:
 	device_remove_attrs(dev);
···
 	 * before dpm_sysfs_remove().
 	 */
 	noio_flag = memalloc_noio_save();
-	if (dev->bus)
-		blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
-					     BUS_NOTIFY_DEL_DEVICE, dev);
+	bus_notify(dev, BUS_NOTIFY_DEL_DEVICE);
 
 	dpm_sysfs_remove(dev);
 	if (parent)
···
 	device_platform_notify_remove(dev);
 	device_links_purge(dev);
 
-	if (dev->bus)
-		blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
-					     BUS_NOTIFY_REMOVED_DEVICE, dev);
+	bus_notify(dev, BUS_NOTIFY_REMOVED_DEVICE);
 	kobject_uevent(&dev->kobj, KOBJ_REMOVE);
 	glue_dir = get_glue_dir(dev);
 	kobject_del(&dev->kobj);
···
  * a name. This memory is returned in tmp and needs to be
  * freed by the caller.
  */
-const char *device_get_devnode(struct device *dev,
+const char *device_get_devnode(const struct device *dev,
 			       umode_t *mode, kuid_t *uid, kgid_t *gid,
 			       const char **tmp)
 {

drivers/base/cpu.c

···
 #endif /* CONFIG_ARCH_CPU_PROBE_RELEASE */
 #endif /* CONFIG_HOTPLUG_CPU */
 
-struct bus_type cpu_subsys = {
-	.name = "cpu",
-	.dev_name = "cpu",
-	.match = cpu_subsys_match,
-#ifdef CONFIG_HOTPLUG_CPU
-	.online = cpu_subsys_online,
-	.offline = cpu_subsys_offline,
-#endif
-};
-EXPORT_SYMBOL_GPL(cpu_subsys);
-
 #ifdef CONFIG_KEXEC
 #include <linux/kexec.h>
 
···
 	return len;
 }
 
-static int cpu_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int cpu_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
 	char *buf = kzalloc(PAGE_SIZE, GFP_KERNEL);
 	if (buf) {
···
 	return 0;
 }
 #endif
+
+struct bus_type cpu_subsys = {
+	.name = "cpu",
+	.dev_name = "cpu",
+	.match = cpu_subsys_match,
+#ifdef CONFIG_HOTPLUG_CPU
+	.online = cpu_subsys_online,
+	.offline = cpu_subsys_offline,
+#endif
+#ifdef CONFIG_GENERIC_CPU_AUTOPROBE
+	.uevent = cpu_uevent,
+#endif
+};
+EXPORT_SYMBOL_GPL(cpu_subsys);
 
 /*
  * register_cpu - Setup a sysfs device for a CPU.
···
 	cpu->dev.offline_disabled = !cpu->hotpluggable;
 	cpu->dev.offline = !cpu_online(num);
 	cpu->dev.of_node = of_get_cpu_node(num, NULL);
-#ifdef CONFIG_GENERIC_CPU_AUTOPROBE
-	cpu->dev.bus->uevent = cpu_uevent;
-#endif
 	cpu->dev.groups = common_cpu_attr_groups;
 	if (cpu->hotpluggable)
 		cpu->dev.groups = hotplugable_cpu_attr_groups;
···
 
 static void __init cpu_register_vulnerabilities(void)
 {
-	if (sysfs_create_group(&cpu_subsys.dev_root->kobj,
-			       &cpu_root_vulnerabilities_group))
-		pr_err("Unable to register CPU vulnerabilities\n");
+	struct device *dev = bus_get_dev_root(&cpu_subsys);
+
+	if (dev) {
+		if (sysfs_create_group(&dev->kobj, &cpu_root_vulnerabilities_group))
+			pr_err("Unable to register CPU vulnerabilities\n");
+		put_device(dev);
+	}
 }
 
 #else

drivers/base/dd.c

···
 DEFINE_SHOW_ATTRIBUTE(deferred_devs);
 
 #ifdef CONFIG_MODULES
-int driver_deferred_probe_timeout = 10;
+static int driver_deferred_probe_timeout = 10;
 #else
-int driver_deferred_probe_timeout;
+static int driver_deferred_probe_timeout;
 #endif
-
-EXPORT_SYMBOL_GPL(driver_deferred_probe_timeout);
 
 static int __init deferred_probe_timeout_setup(char *str)
 {
···
 
 static void __exit deferred_probe_exit(void)
 {
-	debugfs_remove_recursive(debugfs_lookup("devices_deferred", NULL));
+	debugfs_lookup_and_remove("devices_deferred", NULL);
 }
 __exitcall(deferred_probe_exit);
 
···
 	driver_deferred_probe_del(dev);
 	driver_deferred_probe_trigger();
 
-	if (dev->bus)
-		blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
-					     BUS_NOTIFY_BOUND_DRIVER, dev);
-
+	bus_notify(dev, BUS_NOTIFY_BOUND_DRIVER);
 	kobject_uevent(&dev->kobj, KOBJ_BIND);
 }
 
···
 {
 	int ret;
 
-	if (dev->bus)
-		blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
-					     BUS_NOTIFY_BIND_DRIVER, dev);
+	bus_notify(dev, BUS_NOTIFY_BIND_DRIVER);
 
 	ret = sysfs_create_link(&dev->driver->p->kobj, &dev->kobj,
 				kobject_name(&dev->kobj));
···
 		device_links_force_bind(dev);
 		driver_bound(dev);
 	}
-	else if (dev->bus)
-		blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
-					     BUS_NOTIFY_DRIVER_NOT_BOUND, dev);
+	else
+		bus_notify(dev, BUS_NOTIFY_DRIVER_NOT_BOUND);
 	return ret;
 }
 EXPORT_SYMBOL_GPL(device_bind_driver);
···
 probe_failed:
 	driver_sysfs_remove(dev);
 sysfs_failed:
-	if (dev->bus)
-		blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
-					     BUS_NOTIFY_DRIVER_NOT_BOUND, dev);
+	bus_notify(dev, BUS_NOTIFY_DRIVER_NOT_BOUND);
 	if (dev->bus && dev->bus->dma_cleanup)
 		dev->bus->dma_cleanup(dev);
 pinctrl_bind_failed:
···
 
 		driver_sysfs_remove(dev);
 
-		if (dev->bus)
-			blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
-						     BUS_NOTIFY_UNBIND_DRIVER,
-						     dev);
+		bus_notify(dev, BUS_NOTIFY_UNBIND_DRIVER);
 
 		pm_runtime_put_sync(dev);
 
···
 
 		klist_remove(&dev->p->knode_driver);
 		device_pm_check_callbacks(dev);
-		if (dev->bus)
-			blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
-						     BUS_NOTIFY_UNBOUND_DRIVER,
-						     dev);
 
+		bus_notify(dev, BUS_NOTIFY_UNBOUND_DRIVER);
 		kobject_uevent(&dev->kobj, KOBJ_UNBIND);
 	}
 }

drivers/base/devtmpfs.c

···
  * overwrite the default setting if needed.
  */
 
+#define pr_fmt(fmt) "devtmpfs: " fmt
+
 #include <linux/kernel.h>
 #include <linux/syscalls.h>
 #include <linux/mount.h>
···
 
 	err = init_mount("devtmpfs", "dev", "devtmpfs", DEVTMPFS_MFLAGS, NULL);
 	if (err)
-		printk(KERN_INFO "devtmpfs: error mounting %i\n", err);
+		pr_info("error mounting %d\n", err);
 	else
-		printk(KERN_INFO "devtmpfs: mounted\n");
+		pr_info("mounted\n");
 	return err;
 }
 
···
 
 	mnt = vfs_kern_mount(&internal_fs_type, 0, "devtmpfs", opts);
 	if (IS_ERR(mnt)) {
-		printk(KERN_ERR "devtmpfs: unable to create devtmpfs %ld\n",
-				PTR_ERR(mnt));
+		pr_err("unable to create devtmpfs %ld\n", PTR_ERR(mnt));
 		return PTR_ERR(mnt);
 	}
 	err = register_filesystem(&dev_fs_type);
 	if (err) {
-		printk(KERN_ERR "devtmpfs: unable to register devtmpfs "
-		       "type %i\n", err);
+		pr_err("unable to register devtmpfs type %d\n", err);
 		return err;
 	}
 
···
 	}
 
 	if (err) {
-		printk(KERN_ERR "devtmpfs: unable to create devtmpfs %i\n", err);
+		pr_err("unable to create devtmpfs %d\n", err);
 		unregister_filesystem(&dev_fs_type);
 		thread = NULL;
 		return err;
 	}
 
-	printk(KERN_INFO "devtmpfs: initialized\n");
+	pr_info("initialized\n");
 	return 0;
 }

drivers/base/driver.c

···
 	int ret;
 	struct device_driver *other;
 
-	if (!drv->bus->p) {
+	if (!bus_is_registered(drv->bus)) {
 		pr_err("Driver '%s' was unable to register with bus_type '%s' because the bus was not initialized.\n",
 			   drv->name, drv->bus->name);
 		return -EINVAL;
···
 	bus_remove_driver(drv);
 }
 EXPORT_SYMBOL_GPL(driver_unregister);
-
-/**
- * driver_find - locate driver on a bus by its name.
- * @name: name of the driver.
- * @bus: bus to scan for the driver.
- *
- * Call kset_find_obj() to iterate over list of drivers on
- * a bus to find driver by name. Return driver if found.
- *
- * This routine provides no locking to prevent the driver it returns
- * from being unregistered or unloaded while the caller is using it.
- * The caller is responsible for preventing this.
- */
-struct device_driver *driver_find(const char *name, struct bus_type *bus)
-{
-	struct kobject *k = kset_find_obj(bus->p->drivers_kset, name);
-	struct driver_private *priv;
-
-	if (k) {
-		/* Drop reference added by kset_find_obj() */
-		kobject_put(k);
-		priv = to_driver(k);
-		return priv->driver;
-	}
-	return NULL;
-}
-EXPORT_SYMBOL_GPL(driver_find);

drivers/base/memory.c

···
 }
 EXPORT_SYMBOL_GPL(memory_block_size_bytes);
 
-/*
- * Show the first physical section index (number) of this memory block.
- */
+/* Show the memory block ID, relative to the memory block size */
 static ssize_t phys_index_show(struct device *dev,
 			       struct device_attribute *attr, char *buf)
 {
 	struct memory_block *mem = to_memory_block(dev);
-	unsigned long phys_index;
 
-	phys_index = mem->start_section_nr / sections_per_block;
-
-	return sysfs_emit(buf, "%08lx\n", phys_index);
+	return sysfs_emit(buf, "%08lx\n", memory_block_id(mem->start_section_nr));
 }
 
 /*

drivers/base/physical_location.c

···
 
 	dev->physical_location =
 		kzalloc(sizeof(*dev->physical_location), GFP_KERNEL);
-	if (!dev->physical_location)
+	if (!dev->physical_location) {
+		ACPI_FREE(pld);
 		return false;
+	}
+
 	dev->physical_location->panel = pld->panel;
 	dev->physical_location->vertical_position = pld->vertical_position;
 	dev->physical_location->horizontal_position = pld->horizontal_position;

drivers/base/platform.c

···
 	struct resource *r;
 	int ret;
 
-	if (!dev->dev.of_node || IS_ENABLED(CONFIG_OF_IRQ)) {
-		ret = fwnode_irq_get_byname(dev_fwnode(&dev->dev), name);
-		if (ret > 0 || ret == -EPROBE_DEFER)
-			return ret;
-	}
+	ret = fwnode_irq_get_byname(dev_fwnode(&dev->dev), name);
+	if (ret > 0 || ret == -EPROBE_DEFER)
+		return ret;
 
 	r = platform_get_resource_byname(dev, IORESOURCE_IRQ, name);
 	if (r) {
···
  * platform_add_devices - add a numbers of platform devices
  * @devs: array of platform devices to add
  * @num: number of platform devices in array
+ *
+ * Return: 0 on success, negative error number on failure.
  */
 int platform_add_devices(struct platform_device **devs, int num)
 {
···
 	return -ENXIO;
 }
 
+static int is_bound_to_driver(struct device *dev, void *driver)
+{
+	if (dev->driver == driver)
+		return 1;
+	return 0;
+}
+
 /**
  * __platform_driver_probe - register driver for non-hotpluggable device
  * @drv: platform driver structure
···
 int __init_or_module __platform_driver_probe(struct platform_driver *drv,
 		int (*probe)(struct platform_device *), struct module *module)
 {
-	int retval, code;
+	int retval;
 
 	if (drv->driver.probe_type == PROBE_PREFER_ASYNCHRONOUS) {
 		pr_err("%s: drivers registered with %s can not be probed asynchronously\n",
···
 
 	/* temporary section violation during probe() */
 	drv->probe = probe;
-	retval = code = __platform_driver_register(drv, module);
+	retval = __platform_driver_register(drv, module);
 	if (retval)
 		return retval;
 
-	/*
-	 * Fixup that section violation, being paranoid about code scanning
-	 * the list of drivers in order to probe new devices.  Check to see
-	 * if the probe was successful, and make sure any forced probes of
-	 * new devices fail.
-	 */
-	spin_lock(&drv->driver.bus->p->klist_drivers.k_lock);
+	/* Force all new probes of this driver to fail */
 	drv->probe = platform_probe_fail;
-	if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list))
-		retval = -ENODEV;
-	spin_unlock(&drv->driver.bus->p->klist_drivers.k_lock);
 
-	if (code != retval)
+	/* Walk all platform devices and see if any actually bound to this driver.
+	 * If not, return an error as the device should have done so by now.
+	 */
+	if (!bus_for_each_dev(&platform_bus_type, NULL, &drv->driver, is_bound_to_driver)) {
+		retval = -ENODEV;
 		platform_driver_unregister(drv);
+	}
+
 	return retval;
 }
 EXPORT_SYMBOL_GPL(__platform_driver_probe);
···
 	return (strcmp(pdev->name, drv->name) == 0);
 }
 
-static int platform_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int platform_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
-	struct platform_device	*pdev = to_platform_device(dev);
+	const struct platform_device *pdev = to_platform_device(dev);
 	int rc;
 
 	/* Some devices have extra OF data and an OF-style MODALIAS */
···
 	struct platform_driver *drv = to_platform_driver(_dev->driver);
 	struct platform_device *dev = to_platform_device(_dev);
 
-	if (drv->remove) {
+	if (drv->remove_new) {
+		drv->remove_new(dev);
+	} else if (drv->remove) {
 		int ret = drv->remove(dev);
 
 		if (ret)

drivers/base/soc.c

···
 static struct bus_type soc_bus_type = {
 	.name  = "soc",
 };
+static bool soc_bus_registered;
 
 static DEVICE_ATTR(machine,		0444, soc_info_show,  NULL);
 static DEVICE_ATTR(family,		0444, soc_info_show,  NULL);
···
 	const struct attribute_group **soc_attr_groups;
 	int ret;
 
-	if (!soc_bus_type.p) {
+	if (!soc_bus_registered) {
 		if (early_soc_dev_attr)
 			return ERR_PTR(-EBUSY);
 		early_soc_dev_attr = soc_dev_attr;
···
 	ret = bus_register(&soc_bus_type);
 	if (ret)
 		return ret;
+	soc_bus_registered = true;
 
 	if (early_soc_dev_attr)
 		return PTR_ERR(soc_device_register(early_soc_dev_attr));

drivers/base/swnode.c

···
 	kfree(swnode);
 }
 
-static struct kobj_type software_node_type = {
+static const struct kobj_type software_node_type = {
 	.release = software_node_release,
 	.sysfs_ops = &kobj_sysfs_ops,
 };
···
 	kobject_uevent(&swnode->kobj, KOBJ_ADD);
 	return &swnode->fwnode;
 }
-
-/**
- * software_node_register_nodes - Register an array of software nodes
- * @nodes: Zero terminated array of software nodes to be registered
- *
- * Register multiple software nodes at once. If any node in the array
- * has its .parent pointer set (which can only be to another software_node),
- * then its parent **must** have been registered before it is; either outside
- * of this function or by ordering the array such that parent comes before
- * child.
- */
-int software_node_register_nodes(const struct software_node *nodes)
-{
-	int ret;
-	int i;
-
-	for (i = 0; nodes[i].name; i++) {
-		const struct software_node *parent = nodes[i].parent;
-
-		if (parent && !software_node_to_swnode(parent)) {
-			ret = -EINVAL;
-			goto err_unregister_nodes;
-		}
-
-		ret = software_node_register(&nodes[i]);
-		if (ret)
-			goto err_unregister_nodes;
-	}
-
-	return 0;
-
-err_unregister_nodes:
-	software_node_unregister_nodes(nodes);
-	return ret;
-}
-EXPORT_SYMBOL_GPL(software_node_register_nodes);
-
-/**
- * software_node_unregister_nodes - Unregister an array of software nodes
- * @nodes: Zero terminated array of software nodes to be unregistered
- *
- * Unregister multiple software nodes at once. If parent pointers are set up
- * in any of the software nodes then the array **must** be ordered such that
- * parents come before their children.
- *
- * NOTE: If you are uncertain whether the array is ordered such that
- * parents will be unregistered before their children, it is wiser to
- * remove the nodes individually, in the correct order (child before
- * parent).
- */
-void software_node_unregister_nodes(const struct software_node *nodes)
-{
-	unsigned int i = 0;
-
-	while (nodes[i].name)
-		i++;
-
-	while (i--)
-		software_node_unregister(&nodes[i]);
-}
-EXPORT_SYMBOL_GPL(software_node_unregister_nodes);
 
 /**
  * software_node_register_node_group - Register a group of software nodes

drivers/base/test/property-entry-test.c

···
 /* Handling of reference properties */
 static void pe_test_reference(struct kunit *test)
 {
-	static const struct software_node nodes[] = {
-		{ .name = "1", },
-		{ .name = "2", },
-		{ }
-	};
+	static const struct software_node node1 = { .name = "1" };
+	static const struct software_node node2 = { .name = "2" };
+	static const struct software_node *group[] = { &node1, &node2, NULL };
 
 	static const struct software_node_ref_args refs[] = {
-		SOFTWARE_NODE_REFERENCE(&nodes[0]),
-		SOFTWARE_NODE_REFERENCE(&nodes[1], 3, 4),
+		SOFTWARE_NODE_REFERENCE(&node1),
+		SOFTWARE_NODE_REFERENCE(&node2, 3, 4),
 	};
 
 	const struct property_entry entries[] = {
-		PROPERTY_ENTRY_REF("ref-1", &nodes[0]),
-		PROPERTY_ENTRY_REF("ref-2", &nodes[1], 1, 2),
+		PROPERTY_ENTRY_REF("ref-1", &node1),
+		PROPERTY_ENTRY_REF("ref-2", &node2, 1, 2),
 		PROPERTY_ENTRY_REF_ARRAY("ref-3", refs),
 		{ }
 	};
···
 	struct fwnode_reference_args ref;
 	int error;
 
-	error = software_node_register_nodes(nodes);
+	error = software_node_register_node_group(group);
 	KUNIT_ASSERT_EQ(test, error, 0);
 
 	node = fwnode_create_software_node(entries, NULL);
···
 	error = fwnode_property_get_reference_args(node, "ref-1", NULL,
 						   0, 0, &ref);
 	KUNIT_ASSERT_EQ(test, error, 0);
-	KUNIT_EXPECT_PTR_EQ(test, to_software_node(ref.fwnode), &nodes[0]);
+	KUNIT_EXPECT_PTR_EQ(test, to_software_node(ref.fwnode), &node1);
 	KUNIT_EXPECT_EQ(test, ref.nargs, 0U);
 
 	/* wrong index */
···
 	error = fwnode_property_get_reference_args(node, "ref-2", NULL,
 						   1, 0, &ref);
 	KUNIT_ASSERT_EQ(test, error, 0);
-	KUNIT_EXPECT_PTR_EQ(test, to_software_node(ref.fwnode), &nodes[1]);
+	KUNIT_EXPECT_PTR_EQ(test, to_software_node(ref.fwnode), &node2);
 	KUNIT_EXPECT_EQ(test, ref.nargs, 1U);
 	KUNIT_EXPECT_EQ(test, ref.args[0], 1LLU);
 
···
 	error = fwnode_property_get_reference_args(node, "ref-2", NULL,
 						   3, 0, &ref);
 	KUNIT_ASSERT_EQ(test, error, 0);
-	KUNIT_EXPECT_PTR_EQ(test, to_software_node(ref.fwnode), &nodes[1]);
+	KUNIT_EXPECT_PTR_EQ(test, to_software_node(ref.fwnode), &node2);
 	KUNIT_EXPECT_EQ(test, ref.nargs, 3U);
 	KUNIT_EXPECT_EQ(test, ref.args[0], 1LLU);
 	KUNIT_EXPECT_EQ(test, ref.args[1], 2LLU);
···
 	error = fwnode_property_get_reference_args(node, "ref-3", NULL,
 						   0, 0, &ref);
 	KUNIT_ASSERT_EQ(test, error, 0);
-	KUNIT_EXPECT_PTR_EQ(test, to_software_node(ref.fwnode), &nodes[0]);
+	KUNIT_EXPECT_PTR_EQ(test, to_software_node(ref.fwnode), &node1);
 	KUNIT_EXPECT_EQ(test, ref.nargs, 0U);
 
 	/* second reference in the array */
 	error = fwnode_property_get_reference_args(node, "ref-3", NULL,
 						   2, 1, &ref);
 	KUNIT_ASSERT_EQ(test, error, 0);
-	KUNIT_EXPECT_PTR_EQ(test, to_software_node(ref.fwnode), &nodes[1]);
+	KUNIT_EXPECT_PTR_EQ(test, to_software_node(ref.fwnode), &node2);
 	KUNIT_EXPECT_EQ(test, ref.nargs, 2U);
 	KUNIT_EXPECT_EQ(test, ref.args[0], 3LLU);
 	KUNIT_EXPECT_EQ(test, ref.args[1], 4LLU);
···
 	KUNIT_EXPECT_NE(test, error, 0);
 
 	fwnode_remove_software_node(node);
-	software_node_unregister_nodes(nodes);
+	software_node_unregister_node_group(group);
 }
 
 static struct kunit_case property_entry_test_cases[] = {

drivers/base/transport_class.c

···
 				      struct device *dev,
 				      struct device *classdev)
 {
+	struct transport_class *tclass = class_to_transport_class(cont->class);
 	int error = attribute_container_add_class_device(classdev);
 	struct transport_container *tcont = 
 		attribute_container_to_transport_container(cont);
 
-	if (!error && tcont->statistics)
+	if (error)
+		goto err_remove;
+
+	if (tcont->statistics) {
 		error = sysfs_create_group(&classdev->kobj, tcont->statistics);
+		if (error)
+			goto err_del;
+	}
+
+	return 0;
+
+err_del:
+	attribute_container_class_device_del(classdev);
+err_remove:
+	if (tclass->remove)
+		tclass->remove(tcont, dev, classdev);
 
 	return error;
 }

drivers/bcma/main.c

···
 static int bcma_bus_match(struct device *dev, struct device_driver *drv);
 static int bcma_device_probe(struct device *dev);
 static void bcma_device_remove(struct device *dev);
-static int bcma_device_uevent(struct device *dev, struct kobj_uevent_env *env);
+static int bcma_device_uevent(const struct device *dev, struct kobj_uevent_env *env);
 
 static ssize_t manuf_show(struct device *dev, struct device_attribute *attr, char *buf)
 {
···
 	put_device(dev);
 }
 
-static int bcma_device_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int bcma_device_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
-	struct bcma_device *core = container_of(dev, struct bcma_device, dev);
+	const struct bcma_device *core = container_of_const(dev, struct bcma_device, dev);
 
 	return add_uevent_var(env,
 			      "MODALIAS=bcma:m%04Xid%04Xrev%02Xcl%02X",

drivers/bus/fsl-mc/fsl-mc-bus.c

···
 /*
  * fsl_mc_bus_uevent - callback invoked when a device is added
  */
-static int fsl_mc_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int fsl_mc_bus_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
-	struct fsl_mc_device *mc_dev = to_fsl_mc_device(dev);
+	const struct fsl_mc_device *mc_dev = to_fsl_mc_device(dev);
 
 	if (add_uevent_var(env, "MODALIAS=fsl-mc:v%08Xd%s",
 			   mc_dev->obj_desc.vendor,

drivers/bus/mhi/ep/main.c

···
 }
 EXPORT_SYMBOL_GPL(mhi_ep_driver_unregister);
 
-static int mhi_ep_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int mhi_ep_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
-	struct mhi_ep_device *mhi_dev = to_mhi_ep_device(dev);
+	const struct mhi_ep_device *mhi_dev = to_mhi_ep_device(dev);
 
 	return add_uevent_var(env, "MODALIAS=" MHI_EP_DEVICE_MODALIAS_FMT,
 					mhi_dev->name);

drivers/bus/mhi/host/init.c

···
 }
 EXPORT_SYMBOL_GPL(mhi_driver_unregister);
 
-static int mhi_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int mhi_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
-	struct mhi_device *mhi_dev = to_mhi_device(dev);
+	const struct mhi_device *mhi_dev = to_mhi_device(dev);
 
 	return add_uevent_var(env, "MODALIAS=" MHI_DEVICE_MODALIAS_FMT,
 					mhi_dev->name);

drivers/bus/mips_cdmm.c

···
 	return mips_cdmm_lookup(cdrv->id_table, cdev) != NULL;
 }
 
-static int mips_cdmm_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int mips_cdmm_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
-	struct mips_cdmm_device *cdev = to_mips_cdmm_device(dev);
+	const struct mips_cdmm_device *cdev = to_mips_cdmm_device(dev);
 	int retval = 0;
 
 	retval = add_uevent_var(env, "CDMM_CPU=%u", cdev->cpu);

drivers/bus/sunxi-rsb.c

···
 	drv->remove(to_sunxi_rsb_device(dev));
 }
 
+static int sunxi_rsb_device_modalias(const struct device *dev, struct kobj_uevent_env *env)
+{
+	return of_device_uevent_modalias(dev, env);
+}
+
 static struct bus_type sunxi_rsb_bus = {
 	.name		= RSB_CTRL_NAME,
 	.match		= sunxi_rsb_device_match,
 	.probe		= sunxi_rsb_device_probe,
 	.remove		= sunxi_rsb_device_remove,
-	.uevent		= of_device_uevent_modalias,
+	.uevent		= sunxi_rsb_device_modalias,
 };
 
 static void sunxi_rsb_dev_release(struct device *dev)

drivers/cxl/core/memdev.c

···
 	kfree(cxlmd);
 }
 
-static char *cxl_memdev_devnode(struct device *dev, umode_t *mode, kuid_t *uid,
+static char *cxl_memdev_devnode(const struct device *dev, umode_t *mode, kuid_t *uid,
 				kgid_t *gid)
 {
 	return kasprintf(GFP_KERNEL, "cxl/%s", dev_name(dev));
···
 	.groups = cxl_memdev_attribute_groups,
 };
 
-bool is_cxl_memdev(struct device *dev)
+bool is_cxl_memdev(const struct device *dev)
 {
 	return dev->type == &cxl_memdev_type;
 }

drivers/cxl/core/port.c

···
 }
 static DEVICE_ATTR_RO(devtype);
 
-static int cxl_device_id(struct device *dev)
+static int cxl_device_id(const struct device *dev)
 {
 	if (dev->type == &cxl_nvdimm_bridge_type)
 		return CXL_DEVICE_NVDIMM_BRIDGE;
···
 	.groups = cxl_port_attribute_groups,
 };
 
-bool is_cxl_port(struct device *dev)
+bool is_cxl_port(const struct device *dev)
 {
 	return dev->type == &cxl_port_type;
 }
 EXPORT_SYMBOL_NS_GPL(is_cxl_port, CXL);
 
-struct cxl_port *to_cxl_port(struct device *dev)
+struct cxl_port *to_cxl_port(const struct device *dev)
 {
 	if (dev_WARN_ONCE(dev, dev->type != &cxl_port_type,
 			  "not a cxl_port device\n"))
···
 }
 EXPORT_SYMBOL_NS_GPL(cxl_driver_unregister, CXL);
 
-static int cxl_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int cxl_bus_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
 	return add_uevent_var(env, "MODALIAS=" CXL_MODALIAS_FMT,
 			      cxl_device_id(dev));

drivers/cxl/cxl.h

···
 	return port->uport == port->dev.parent;
 }
 
-bool is_cxl_port(struct device *dev);
-struct cxl_port *to_cxl_port(struct device *dev);
+bool is_cxl_port(const struct device *dev);
+struct cxl_port *to_cxl_port(const struct device *dev);
 struct pci_bus;
 int devm_cxl_register_pci_bus(struct device *host, struct device *uport,
 			      struct pci_bus *bus);

drivers/cxl/cxlmem.h

···
 	return to_cxl_memdev(port->uport);
 }
 
-bool is_cxl_memdev(struct device *dev);
+bool is_cxl_memdev(const struct device *dev);
 static inline bool is_cxl_endpoint(struct cxl_port *port)
 {
 	return is_cxl_memdev(port->uport);

drivers/dax/bus.c

···
 	char dev_name[DAX_NAME_LEN];
 };
 
-static int dax_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int dax_bus_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
 	/*
 	 * We only ever expect to handle device-dax instances, i.e. the

drivers/eisa/eisa-bus.c

···
 	return 0;
 }
 
-static int eisa_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int eisa_bus_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
-	struct eisa_device *edev = to_eisa_device(dev);
+	const struct eisa_device *edev = to_eisa_device(dev);
 
 	add_uevent_var(env, "MODALIAS=" EISA_DEVICE_MODALIAS_FMT, edev->id.sig);
 	return 0;

drivers/firewire/core-device.c

···
 	}
 }
 
-static void get_modalias_ids(struct fw_unit *unit, int *id)
+static void get_modalias_ids(const struct fw_unit *unit, int *id)
 {
 	get_ids(&fw_parent_device(unit)->config_rom[5], id);
 	get_ids(unit->directory, id);
···
 	driver->remove(fw_unit(dev));
 }
 
-static int get_modalias(struct fw_unit *unit, char *buffer, size_t buffer_size)
+static int get_modalias(const struct fw_unit *unit, char *buffer, size_t buffer_size)
 {
 	int id[] = {0, 0, 0, 0};
 
···
 			id[0], id[1], id[2], id[3]);
 }
 
-static int fw_unit_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int fw_unit_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
-	struct fw_unit *unit = fw_unit(dev);
+	const struct fw_unit *unit = fw_unit(dev);
 	char modalias[64];
 
 	get_modalias(unit, modalias, sizeof(modalias));

drivers/firmware/arm_ffa/bus.c

···
 	ffa_drv->remove(to_ffa_dev(dev));
 }
 
-static int ffa_device_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int ffa_device_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
-	struct ffa_device *ffa_dev = to_ffa_dev(dev);
+	const struct ffa_device *ffa_dev = to_ffa_dev(dev);
 
 	return add_uevent_var(env, "MODALIAS=arm_ffa:%04x:%pUb",
 			      ffa_dev->vm_id, &ffa_dev->uuid);

drivers/firmware/arm_scmi/bus.c

···
 #include <linux/kernel.h>
 #include <linux/slab.h>
 #include <linux/device.h>
+#include <linux/of.h>
 
 #include "common.h"
 
···
 	scmi_dev->id = id;
 	scmi_dev->protocol_id = protocol;
 	scmi_dev->dev.parent = parent;
-	scmi_dev->dev.of_node = np;
+	device_set_node(&scmi_dev->dev, of_fwnode_handle(np));
 	scmi_dev->dev.bus = &scmi_bus_type;
 	scmi_dev->dev.release = scmi_device_release;
 	dev_set_name(&scmi_dev->dev, "scmi_dev.%d", id);

drivers/fpga/dfl.c

···
 		ddrv->remove(ddev);
 }
 
-static int dfl_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int dfl_bus_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
-	struct dfl_device *ddev = to_dfl_dev(dev);
+	const struct dfl_device *ddev = to_dfl_dev(dev);
 
 	return add_uevent_var(env, "MODALIAS=dfl:t%04Xf%04X",
 			      ddev->type, ddev->feature_id);

drivers/fsi/fsi-core.c

···
 	NULL,
 };
 
-static char *cfam_devnode(struct device *dev, umode_t *mode,
+static char *cfam_devnode(const struct device *dev, umode_t *mode,
 			  kuid_t *uid, kgid_t *gid)
 {
-	struct fsi_slave *slave = to_fsi_slave(dev);
+	const struct fsi_slave *slave = to_fsi_slave(dev);
 
 #ifdef CONFIG_FSI_NEW_DEV_NODE
 	return kasprintf(GFP_KERNEL, "fsi/cfam%d", slave->cdev_idx);
···
 	.groups = cfam_attr_groups
 };
 
-static char *fsi_cdev_devnode(struct device *dev, umode_t *mode,
+static char *fsi_cdev_devnode(const struct device *dev, umode_t *mode,
 			      kuid_t *uid, kgid_t *gid)
 {
 #ifdef CONFIG_FSI_NEW_DEV_NODE

drivers/gpio/gpiolib.c

···
 {
 	int ret;
 
+	/*
+	 * If fwnode doesn't belong to another device, it's safe to clear its
+	 * initialized flag.
+	 */
+	if (gdev->dev.fwnode && !gdev->dev.fwnode->dev)
+		fwnode_dev_initialized(gdev->dev.fwnode, false);
+
 	ret = gcdev_register(gdev, gpio_devt);
 	if (ret)
 		return ret;

drivers/gpu/drm/display/drm_dp_aux_bus.c

···
 	kfree(aux_ep_with_data);
 }
 
+static int dp_aux_ep_dev_modalias(const struct device *dev, struct kobj_uevent_env *env)
+{
+	return of_device_uevent_modalias(dev, env);
+}
+
 static struct device_type dp_aux_device_type_type = {
 	.groups		= dp_aux_ep_dev_groups,
-	.uevent		= of_device_uevent_modalias,
+	.uevent		= dp_aux_ep_dev_modalias,
 	.release	= dp_aux_ep_dev_release,
 };
 

drivers/gpu/drm/drm_mipi_dsi.c

···
 	return 0;
 }
 
-static int mipi_dsi_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int mipi_dsi_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
-	struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
+	const struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
 	int err;
 
 	err = of_device_uevent_modalias(dev, env);

drivers/gpu/host1x/bus.c

···
 	return strcmp(dev_name(dev), drv->name) == 0;
 }
 
-static int host1x_device_uevent(struct device *dev,
+static int host1x_device_uevent(const struct device *dev,
 				struct kobj_uevent_env *env)
 {
 	struct device_node *np = dev->parent->of_node;

drivers/greybus/core.c

···
 	return 0;
 }
 
-static int greybus_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int greybus_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
-	struct gb_host_device *hd;
-	struct gb_module *module = NULL;
-	struct gb_interface *intf = NULL;
-	struct gb_control *control = NULL;
-	struct gb_bundle *bundle = NULL;
-	struct gb_svc *svc = NULL;
+	const struct gb_host_device *hd;
+	const struct gb_module *module = NULL;
+	const struct gb_interface *intf = NULL;
+	const struct gb_control *control = NULL;
+	const struct gb_bundle *bundle = NULL;
+	const struct gb_svc *svc = NULL;
 
 	if (is_gb_host_device(dev)) {
 		hd = to_gb_host_device(dev);

drivers/hid/hid-core.c

···
 };
 __ATTRIBUTE_GROUPS(hid_dev);
 
-static int hid_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int hid_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
-	struct hid_device *hdev = to_hid_device(dev);
+	const struct hid_device *hdev = to_hid_device(dev);
 
 	if (add_uevent_var(env, "HID_ID=%04X:%08X:%08X",
 			hdev->bus, hdev->vendor, hdev->product))

drivers/hid/intel-ish-hid/ishtp/bus.c

···
 };
 ATTRIBUTE_GROUPS(ishtp_cl_dev);
 
-static int ishtp_cl_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int ishtp_cl_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
 	if (add_uevent_var(env, "MODALIAS=" ISHTP_MODULE_PREFIX "%s", dev_name(dev)))
 		return -ENOMEM;

drivers/hsi/hsi_core.c

···
 };
 ATTRIBUTE_GROUPS(hsi_bus_dev);
 
-static int hsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int hsi_bus_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
 	add_uevent_var(env, "MODALIAS=hsi:%s", dev_name(dev));
 

drivers/hv/vmbus_drv.c

···
  * representation of the device guid (each byte of the guid will be
  * represented with two hex characters.
  */
-static int vmbus_uevent(struct device *device, struct kobj_uevent_env *env)
+static int vmbus_uevent(const struct device *device, struct kobj_uevent_env *env)
 {
-	struct hv_device *dev = device_to_hv_device(device);
+	const struct hv_device *dev = device_to_hv_device(device);
 	const char *format = "MODALIAS=vmbus:%*phN";
 
 	return add_uevent_var(env, format, UUID_SIZE, &dev->dev_type);

drivers/hwtracing/intel_th/core.c

···
 	.release	= intel_th_device_release,
 };
 
-static char *intel_th_output_devnode(struct device *dev, umode_t *mode,
+static char *intel_th_output_devnode(const struct device *dev, umode_t *mode,
 				     kuid_t *uid, kgid_t *gid)
 {
-	struct intel_th_device *thdev = to_intel_th_device(dev);
-	struct intel_th *th = to_intel_th(thdev);
+	const struct intel_th_device *thdev = to_intel_th_device(dev);
+	const struct intel_th *th = to_intel_th(thdev);
 	char *node;
 
 	if (thdev->id >= 0)

drivers/hwtracing/intel_th/intel_th.h

···
  * INTEL_TH_SWITCH and INTEL_TH_SOURCE are children of the intel_th device.
  */
 static inline struct intel_th_device *
-to_intel_th_parent(struct intel_th_device *thdev)
+to_intel_th_parent(const struct intel_th_device *thdev)
 {
 	struct device *parent = thdev->dev.parent;
 
···
 	return to_intel_th_device(parent);
 }
 
-static inline struct intel_th *to_intel_th(struct intel_th_device *thdev)
+static inline struct intel_th *to_intel_th(const struct intel_th_device *thdev)
 {
 	if (thdev->type == INTEL_TH_OUTPUT)
 		thdev = to_intel_th_parent(thdev);

drivers/i2c/i2c-core-base.c

···
 	return 0;
 }
 
-static int i2c_device_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int i2c_device_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
-	struct i2c_client *client = to_i2c_client(dev);
+	const struct i2c_client *client = to_i2c_client(dev);
 	int rc;
 
 	rc = of_device_uevent_modalias(dev, env);

drivers/i3c/device.c

···
  *
  * Retrieve I3C dev info.
  */
-void i3c_device_get_info(struct i3c_device *dev,
+void i3c_device_get_info(const struct i3c_device *dev,
 			 struct i3c_device_info *info)
 {
 	if (!info)
···
 	return &i3cdev->dev;
 }
 EXPORT_SYMBOL_GPL(i3cdev_to_dev);
-
-/**
- * dev_to_i3cdev() - Returns the I3C device containing @dev
- * @dev: device object
- *
- * Return: a pointer to an I3C device object.
- */
-struct i3c_device *dev_to_i3cdev(struct device *dev)
-{
-	return container_of(dev, struct i3c_device, dev);
-}
-EXPORT_SYMBOL_GPL(dev_to_i3cdev);
 
 /**
  * i3c_device_match_id() - Returns the i3c_device_id entry matching @i3cdev

drivers/i3c/master.c

···
 };
 ATTRIBUTE_GROUPS(i3c_device);
 
-static int i3c_device_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int i3c_device_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
-	struct i3c_device *i3cdev = dev_to_i3cdev(dev);
+	const struct i3c_device *i3cdev = dev_to_i3cdev(dev);
 	struct i3c_device_info devinfo;
 	u16 manuf, part, ext;
 

drivers/input/input.c

···
 INPUT_DEV_STRING_ATTR_SHOW(uniq);
 
 static int input_print_modalias_bits(char *buf, int size,
-				     char name, unsigned long *bm,
+				     char name, const unsigned long *bm,
 				     unsigned int min_bit, unsigned int max_bit)
 {
 	int len = 0, i;
···
 	return len;
 }
 
-static int input_print_modalias(char *buf, int size, struct input_dev *id,
+static int input_print_modalias(char *buf, int size, const struct input_dev *id,
 				int add_cr)
 {
 	int len;
···
 }
 static DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL);
 
-static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
+static int input_print_bitmap(char *buf, int buf_size, const unsigned long *bitmap,
 			      int max, int add_cr);
 
 static ssize_t input_dev_show_properties(struct device *dev,
···
 	.attrs	= input_dev_id_attrs,
 };
 
-static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
+static int input_print_bitmap(char *buf, int buf_size, const unsigned long *bitmap,
 			      int max, int add_cr)
 {
 	int i;
···
  * device bitfields.
  */
 static int input_add_uevent_bm_var(struct kobj_uevent_env *env,
-				   const char *name, unsigned long *bitmap, int max)
+				   const char *name, const unsigned long *bitmap, int max)
 {
 	int len;
 
···
 }
 
 static int input_add_uevent_modalias_var(struct kobj_uevent_env *env,
-					 struct input_dev *dev)
+					 const struct input_dev *dev)
 {
 	int len;
 
···
 			return err;					\
 	} while (0)
 
-static int input_dev_uevent(struct device *device, struct kobj_uevent_env *env)
+static int input_dev_uevent(const struct device *device, struct kobj_uevent_env *env)
 {
-	struct input_dev *dev = to_input_dev(device);
+	const struct input_dev *dev = to_input_dev(device);
 
 	INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x",
 				dev->id.bustype, dev->id.vendor,

drivers/input/serio/serio.c

···
 			return err;					\
 	} while (0)
 
-static int serio_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int serio_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
-	struct serio *serio;
+	const struct serio *serio;
 
 	if (!dev)
 		return -ENODEV;

drivers/ipack/ipack.c

···
 		drv->ops->remove(dev);
 }
 
-static int ipack_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int ipack_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
-	struct ipack_device *idev;
+	const struct ipack_device *idev;
 
 	if (!dev)
 		return -ENODEV;

drivers/irqchip/irq-imx-gpcv2.c

···
 	 * later the GPC power domain driver will not be skipped.
 	 */
 	of_node_clear_flag(node, OF_POPULATED);
+	fwnode_dev_initialized(domain->fwnode, false);
 	return 0;
 }
 

drivers/macintosh/macio_asic.c

···
 	return 0;
 }
 
+static int macio_device_modalias(const struct device *dev, struct kobj_uevent_env *env)
+{
+	return of_device_uevent_modalias(dev, env);
+}
+
 extern const struct attribute_group *macio_dev_groups[];
 
 struct bus_type macio_bus_type = {
        .name	= "macio",
        .match	= macio_bus_match,
-       .uevent = of_device_uevent_modalias,
+       .uevent	= macio_device_modalias,
        .probe	= macio_device_probe,
        .remove	= macio_device_remove,
        .shutdown = macio_device_shutdown,

drivers/mcb/mcb-core.c

···
 	return 0;
 }
 
-static int mcb_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int mcb_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
-	struct mcb_device *mdev = to_mcb_device(dev);
+	const struct mcb_device *mdev = to_mcb_device(dev);
 	int ret;
 
 	ret = add_uevent_var(env, "MODALIAS=mcb:16z%03d", mdev->id);

drivers/media/pci/intel/ipu3/cio2-bridge.c

···
 		 SWNODE_GRAPH_ENDPOINT_NAME_FMT, 0); /* And endpoint 0 */
 }
 
+static void cio2_bridge_init_swnode_group(struct cio2_sensor *sensor)
+{
+	struct software_node *nodes = sensor->swnodes;
+
+	sensor->group[SWNODE_SENSOR_HID] = &nodes[SWNODE_SENSOR_HID];
+	sensor->group[SWNODE_SENSOR_PORT] = &nodes[SWNODE_SENSOR_PORT];
+	sensor->group[SWNODE_SENSOR_ENDPOINT] = &nodes[SWNODE_SENSOR_ENDPOINT];
+	sensor->group[SWNODE_CIO2_PORT] = &nodes[SWNODE_CIO2_PORT];
+	sensor->group[SWNODE_CIO2_ENDPOINT] = &nodes[SWNODE_CIO2_ENDPOINT];
+	if (sensor->ssdb.vcmtype)
+		sensor->group[SWNODE_VCM] =  &nodes[SWNODE_VCM];
+}
+
 static void cio2_bridge_create_connection_swnodes(struct cio2_bridge *bridge,
 						  struct cio2_sensor *sensor)
 {
···
 	if (sensor->ssdb.vcmtype)
 		nodes[SWNODE_VCM] =
 			NODE_VCM(cio2_vcm_types[sensor->ssdb.vcmtype - 1]);
+
+	cio2_bridge_init_swnode_group(sensor);
 }
 
 static void cio2_bridge_instantiate_vcm_i2c_client(struct cio2_sensor *sensor)
···
 
 	for (i = 0; i < bridge->n_sensors; i++) {
 		sensor = &bridge->sensors[i];
-		software_node_unregister_nodes(sensor->swnodes);
+		software_node_unregister_node_group(sensor->group);
 		ACPI_FREE(sensor->pld);
 		acpi_dev_put(sensor->adev);
 		i2c_unregister_device(sensor->vcm_i2c_client);
···
 				      struct cio2_bridge *bridge,
 				      struct pci_dev *cio2)
 {
-	struct fwnode_handle *fwnode;
+	struct fwnode_handle *fwnode, *primary;
 	struct cio2_sensor *sensor;
 	struct acpi_device *adev;
 	acpi_status status;
···
 		cio2_bridge_create_fwnode_properties(sensor, bridge, cfg);
 		cio2_bridge_create_connection_swnodes(bridge, sensor);
 
-		ret = software_node_register_nodes(sensor->swnodes);
+		ret = software_node_register_node_group(sensor->group);
 		if (ret)
 			goto err_free_pld;
 
···
 		}
 
 		sensor->adev = acpi_dev_get(adev);
-		adev->fwnode.secondary = fwnode;
+
+		primary = acpi_fwnode_handle(adev);
+		primary->secondary = fwnode;
 
 		cio2_bridge_instantiate_vcm_i2c_client(sensor);
 
···
 	return 0;
 
 err_free_swnodes:
-	software_node_unregister_nodes(sensor->swnodes);
+	software_node_unregister_node_group(sensor->group);
 err_free_pld:
 	ACPI_FREE(sensor->pld);
 err_put_adev:

drivers/media/pci/intel/ipu3/cio2-bridge.h

···
 	struct acpi_device *adev;
 	struct i2c_client *vcm_i2c_client;
 
-	/* SWNODE_COUNT + 1 for terminating empty node */
-	struct software_node swnodes[SWNODE_COUNT + 1];
+	/* SWNODE_COUNT + 1 for terminating NULL */
+	const struct software_node *group[SWNODE_COUNT + 1];
+	struct software_node swnodes[SWNODE_COUNT];
 	struct cio2_node_names node_names;
 
 	struct cio2_sensor_ssdb ssdb;

drivers/media/rc/rc-main.c

···
 	kfree(dev);
 }
 
-static int rc_dev_uevent(struct device *device, struct kobj_uevent_env *env)
+static int rc_dev_uevent(const struct device *device, struct kobj_uevent_env *env)
 {
 	struct rc_dev *dev = to_rc_dev(device);
 	int ret = 0;

drivers/memstick/core/memstick.c

···
 	return 0;
 }
 
-static int memstick_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int memstick_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
-	struct memstick_dev *card = container_of(dev, struct memstick_dev,
-						  dev);
+	const struct memstick_dev *card = container_of_const(dev, struct memstick_dev,
+							     dev);
 
 	if (add_uevent_var(env, "MEMSTICK_TYPE=%02X", card->id.type))
 		return -ENOMEM;

drivers/misc/mei/bus.c

···
  *
  * Return: 0 on success -ENOMEM on when add_uevent_var fails
  */
-static int mei_cl_device_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int mei_cl_device_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
-	struct mei_cl_device *cldev = to_mei_cl_device(dev);
+	const struct mei_cl_device *cldev = to_mei_cl_device(dev);
 	const uuid_le *uuid = mei_me_cl_uuid(cldev->me_cl);
 	u8 version = mei_me_cl_ver(cldev->me_cl);
 

drivers/misc/tifm_core.c

···
 	return 0;
 }
 
-static int tifm_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int tifm_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
-	struct tifm_dev *sock = container_of(dev, struct tifm_dev, dev);
+	const struct tifm_dev *sock = container_of_const(dev, struct tifm_dev, dev);
 
 	if (add_uevent_var(env, "TIFM_CARD_TYPE=%s", tifm_media_type_name(sock->type, 1)))
 		return -ENOMEM;

drivers/mmc/core/bus.c

···
 ATTRIBUTE_GROUPS(mmc_dev);
 
 static int
-mmc_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
+mmc_bus_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
-	struct mmc_card *card = mmc_dev_to_card(dev);
+	const struct mmc_card *card = mmc_dev_to_card(dev);
 	const char *type;
 	unsigned int i;
 	int retval = 0;

drivers/mmc/core/sdio_bus.c

···
 }
 
 static int
-sdio_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
+sdio_bus_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
-	struct sdio_func *func = dev_to_sdio_func(dev);
+	const struct sdio_func *func = dev_to_sdio_func(dev);
 	unsigned int i;
 
 	if (add_uevent_var(env,

drivers/mtd/mtdpart.c

···
 {
 	struct mtd_part_parser *parser;
 	struct device_node *np;
+	struct device_node *child;
 	struct property *prop;
 	struct device *dev;
 	const char *compat;
···
 		of_node_get(np);
 	else
 		np = of_get_child_by_name(np, "partitions");
+
+	/*
+	 * Don't create devices that are added to a bus but will never get
+	 * probed. That'll cause fw_devlink to block probing of consumers of
+	 * this partition until the partition device is probed.
+	 */
+	for_each_child_of_node(np, child)
+		if (of_device_is_compatible(child, "nvmem-cells"))
+			of_node_set_flag(child, OF_POPULATED);
 
 	of_property_for_each_string(np, "compatible", prop, compat) {
 		parser = mtd_part_get_compatible_parser(compat);

drivers/net/phy/mdio_bus.c

···
 	return 0;
 }
 
-static int mdio_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int mdio_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
 	int rc;
 

drivers/net/xen-netback/xenbus.c

···
  * and vif variables to the environment, for the benefit of the vif-* hotplug
  * scripts.
  */
-static int netback_uevent(struct xenbus_device *xdev,
+static int netback_uevent(const struct xenbus_device *xdev,
 			  struct kobj_uevent_env *env)
 {
 	struct backend_info *be = dev_get_drvdata(&xdev->dev);

drivers/nvdimm/bus.c

···
 struct class *nd_class;
 static DEFINE_IDA(nd_ida);
 
-static int to_nd_device_type(struct device *dev)
+static int to_nd_device_type(const struct device *dev)
 {
 	if (is_nvdimm(dev))
 		return ND_DEVICE_DIMM;
···
 	return 0;
 }
 
-static int nvdimm_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int nvdimm_bus_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
 	return add_uevent_var(env, "MODALIAS=" ND_DEVICE_MODALIAS_FMT,
 			to_nd_device_type(dev));

drivers/nvdimm/dax_devs.c

···
 	.groups = nd_pfn_attribute_groups,
 };
 
-bool is_nd_dax(struct device *dev)
+bool is_nd_dax(const struct device *dev)
 {
 	return dev ? dev->type == &nd_dax_device_type : false;
 }

drivers/nvdimm/dimm_devs.c

···
 	.groups = nvdimm_attribute_groups,
 };
 
-bool is_nvdimm(struct device *dev)
+bool is_nvdimm(const struct device *dev)
 {
 	return dev->type == &nvdimm_device_type;
 }

drivers/nvdimm/nd-core.h

···
 }
 #endif
 
-bool is_nvdimm(struct device *dev);
-bool is_nd_pmem(struct device *dev);
-bool is_nd_volatile(struct device *dev);
-static inline bool is_nd_region(struct device *dev)
+bool is_nvdimm(const struct device *dev);
+bool is_nd_pmem(const struct device *dev);
+bool is_nd_volatile(const struct device *dev);
+static inline bool is_nd_region(const struct device *dev)
 {
 	return is_nd_pmem(dev) || is_nd_volatile(dev);
 }
-static inline bool is_memory(struct device *dev)
+static inline bool is_memory(const struct device *dev)
 {
 	return is_nd_pmem(dev) || is_nd_volatile(dev);
 }

drivers/nvdimm/nd.h

···
 struct nd_dax *to_nd_dax(struct device *dev);
 #if IS_ENABLED(CONFIG_NVDIMM_DAX)
 int nd_dax_probe(struct device *dev, struct nd_namespace_common *ndns);
-bool is_nd_dax(struct device *dev);
+bool is_nd_dax(const struct device *dev);
 struct device *nd_dax_create(struct nd_region *nd_region);
 #else
 static inline int nd_dax_probe(struct device *dev,
···
 	return -ENODEV;
 }
 
-static inline bool is_nd_dax(struct device *dev)
+static inline bool is_nd_dax(const struct device *dev)
 {
 	return false;
 }

drivers/nvdimm/region_devs.c

···
 	.groups = nd_region_attribute_groups,
 };
 
-bool is_nd_pmem(struct device *dev)
+bool is_nd_pmem(const struct device *dev)
 {
 	return dev ? dev->type == &nd_pmem_device_type : false;
 }
 
-bool is_nd_volatile(struct device *dev)
+bool is_nd_volatile(const struct device *dev)
 {
 	return dev ? dev->type == &nd_volatile_device_type : false;
 }

drivers/of/device.c

···
 }
 EXPORT_SYMBOL(of_device_get_match_data);
 
-static ssize_t of_device_get_modalias(struct device *dev, char *str, ssize_t len)
+static ssize_t of_device_get_modalias(const struct device *dev, char *str, ssize_t len)
 {
 	const char *compat;
 	char *c;
···
 	mutex_unlock(&of_mutex);
 }
 
-int of_device_uevent_modalias(struct device *dev, struct kobj_uevent_env *env)
+int of_device_uevent_modalias(const struct device *dev, struct kobj_uevent_env *env)
 {
 	int sl;
 

drivers/of/property.c

···
 	return of_device_get_match_data(dev);
 }
 
-static bool of_is_ancestor_of(struct device_node *test_ancestor,
-			      struct device_node *child)
-{
-	of_node_get(child);
-	while (child) {
-		if (child == test_ancestor) {
-			of_node_put(child);
-			return true;
-		}
-		child = of_get_next_parent(child);
-	}
-	return false;
-}
-
 static struct device_node *of_get_compat_node(struct device_node *np)
 {
 	of_node_get(np);
···
 	return node;
 }
 
-/**
- * of_link_to_phandle - Add fwnode link to supplier from supplier phandle
- * @con_np: consumer device tree node
- * @sup_np: supplier device tree node
- *
- * Given a phandle to a supplier device tree node (@sup_np), this function
- * finds the device that owns the supplier device tree node and creates a
- * device link from @dev consumer device to the supplier device. This function
- * doesn't create device links for invalid scenarios such as trying to create a
- * link with a parent device as the consumer of its child device. In such
- * cases, it returns an error.
- *
- * Returns:
- * - 0 if fwnode link successfully created to supplier
- * - -EINVAL if the supplier link is invalid and should not be created
- * - -ENODEV if struct device will never be create for supplier
- */
-static int of_link_to_phandle(struct device_node *con_np,
+static void of_link_to_phandle(struct device_node *con_np,
 			      struct device_node *sup_np)
 {
-	struct device *sup_dev;
-	struct device_node *tmp_np = sup_np;
+	struct device_node *tmp_np = of_node_get(sup_np);
 
-	/*
-	 * Find the device node that contains the supplier phandle.  It may be
-	 * @sup_np or it may be an ancestor of @sup_np.
-	 */
-	sup_np = of_get_compat_node(sup_np);
-	if (!sup_np) {
-		pr_debug("Not linking %pOFP to %pOFP - No device\n",
-			 con_np, tmp_np);
-		return -ENODEV;
-	}
+	/* Check that sup_np and its ancestors are available. */
+	while (tmp_np) {
+		if (of_fwnode_handle(tmp_np)->dev) {
+			of_node_put(tmp_np);
+			break;
+		}
 
-	/*
-	 * Don't allow linking a device node as a consumer of one of its
-	 * descendant nodes. By definition, a child node can't be a functional
-	 * dependency for the parent node.
-	 */
-	if (of_is_ancestor_of(con_np, sup_np)) {
-		pr_debug("Not linking %pOFP to %pOFP - is descendant\n",
-			 con_np, sup_np);
-		of_node_put(sup_np);
-		return -EINVAL;
-	}
+		if (!of_device_is_available(tmp_np)) {
+			of_node_put(tmp_np);
+			return;
+		}
 
-	/*
-	 * Don't create links to "early devices" that won't have struct devices
-	 * created for them.
-	 */
-	sup_dev = get_dev_from_fwnode(&sup_np->fwnode);
-	if (!sup_dev &&
-	    (of_node_check_flag(sup_np, OF_POPULATED) ||
-	     sup_np->fwnode.flags & FWNODE_FLAG_NOT_DEVICE)) {
-		pr_debug("Not linking %pOFP to %pOFP - No struct device\n",
-			 con_np, sup_np);
-		of_node_put(sup_np);
-		return -ENODEV;
+		tmp_np = of_get_next_parent(tmp_np);
 	}
-	put_device(sup_dev);
 
 	fwnode_link_add(of_fwnode_handle(con_np), of_fwnode_handle(sup_np));
-	of_node_put(sup_np);
-
-	return 0;
 }
 
 /**

drivers/pci/pci-driver.c

···
 }
 EXPORT_SYMBOL(pci_dev_put);
 
-static int pci_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int pci_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
-	struct pci_dev *pdev;
+	const struct pci_dev *pdev;
 
 	if (!dev)
 		return -ENODEV;

drivers/pcmcia/ds.c

···
 	return 0;
 }
 
-static int pcmcia_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int pcmcia_bus_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
-	struct pcmcia_device *p_dev;
+	const struct pcmcia_device *p_dev;
 	int i;
 	u32 hash[4] = { 0, 0, 0, 0};
 

drivers/platform/surface/aggregator/bus.c

···
 };
 ATTRIBUTE_GROUPS(ssam_device);
 
-static int ssam_device_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int ssam_device_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
-	struct ssam_device *sdev = to_ssam_device(dev);
+	const struct ssam_device *sdev = to_ssam_device(dev);
 
 	return add_uevent_var(env, "MODALIAS=ssam:d%02Xc%02Xt%02Xi%02Xf%02X",
 			      sdev->uid.domain, sdev->uid.category,

drivers/platform/x86/wmi.c

···
 }
 EXPORT_SYMBOL_GPL(wmi_get_acpi_device_uid);
 
-static struct wmi_block *dev_to_wblock(struct device *dev)
-{
-	return container_of(dev, struct wmi_block, dev.dev);
-}
-
-static struct wmi_device *dev_to_wdev(struct device *dev)
-{
-	return container_of(dev, struct wmi_device, dev);
-}
+#define dev_to_wblock(__dev)	container_of_const(__dev, struct wmi_block, dev.dev)
+#define dev_to_wdev(__dev)	container_of_const(__dev, struct wmi_device, dev)
 
 static inline struct wmi_driver *drv_to_wdrv(struct device_driver *drv)
 {
···
 };
 ATTRIBUTE_GROUPS(wmi_method);
 
-static int wmi_dev_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int wmi_dev_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
-	struct wmi_block *wblock = dev_to_wblock(dev);
+	const struct wmi_block *wblock = dev_to_wblock(dev);
 
 	if (add_uevent_var(env, "MODALIAS=wmi:%pUL", &wblock->gblock.guid))
 		return -ENOMEM;

drivers/rapidio/rio-driver.c

···
       out:return 0;
 }
 
-static int rio_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int rio_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
-	struct rio_dev *rdev;
+	const struct rio_dev *rdev;
 
 	if (!dev)
 		return -ENODEV;

drivers/rpmsg/rpmsg_core.c

···
 	return of_driver_match_device(dev, drv);
 }
 
-static int rpmsg_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int rpmsg_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
-	struct rpmsg_device *rpdev = to_rpmsg_device(dev);
+	const struct rpmsg_device *rpdev = to_rpmsg_device(dev);
 	int ret;
 
 	ret = of_device_uevent_modalias(dev, env);

drivers/s390/cio/css.c

···
 		sch->driver->shutdown(sch);
 }
 
-static int css_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int css_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
-	struct subchannel *sch = to_subchannel(dev);
+	const struct subchannel *sch = to_subchannel(dev);
 	int ret;
 
 	ret = add_uevent_var(env, "ST=%01X", sch->st);

drivers/s390/cio/device.c

···
  * specified size. Return length of resulting string (excluding trailing '\0')
  * even if string doesn't fit buffer (snprintf semantics). */
 static int snprint_alias(char *buf, size_t size,
-			 struct ccw_device_id *id, const char *suffix)
+			 const struct ccw_device_id *id, const char *suffix)
 {
 	int len;
 
···
 
 /* Set up environment variables for ccw device uevent. Return 0 on success,
  * non-zero otherwise. */
-static int ccw_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int ccw_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
-	struct ccw_device *cdev = to_ccwdev(dev);
-	struct ccw_device_id *id = &(cdev->id);
+	const struct ccw_device *cdev = to_ccwdev(dev);
+	const struct ccw_device_id *id = &(cdev->id);
 	int ret;
 	char modalias_buf[30];
 

drivers/s390/cio/scm.c

···
 		scmdrv->remove(scmdev);
 }
 
-static int scmdev_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int scmdev_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
 	return add_uevent_var(env, "MODALIAS=scm:scmdev");
 }

drivers/s390/crypto/ap_bus.c

···
  * It sets up a single environment variable DEV_TYPE which contains the
  * hardware device type.
  */
-static int ap_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int ap_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
 	int rc = 0;
-	struct ap_device *ap_dev = to_ap_dev(dev);
+	const struct ap_device *ap_dev = to_ap_dev(dev);
 
 	/* Uevents from ap bus core don't need extensions to the env */
 	if (dev == ap_root_device)

drivers/scsi/scsi_sysfs.c

···
 	return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
 }
 
-static int scsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int scsi_bus_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
-	struct scsi_device *sdev;
+	const struct scsi_device *sdev;
 
 	if (dev->type != &scsi_dev_type)
 		return 0;

drivers/sh/maple/maple.c

···
 	return 0;
 }
 
-static int maple_bus_uevent(struct device *dev,
-			    struct kobj_uevent_env *env)
-{
-	return 0;
-}
-
 static void maple_bus_release(struct device *dev)
 {
 }
···
 struct bus_type maple_bus_type = {
 	.name = "maple",
 	.match = maple_match_bus_driver,
-	.uevent = maple_bus_uevent,
 };
 EXPORT_SYMBOL_GPL(maple_bus_type);
 

drivers/slimbus/core.c

···
 	}
 }
 
-static int slim_device_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int slim_device_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
-	struct slim_device *sbdev = to_slim_device(dev);
+	const struct slim_device *sbdev = to_slim_device(dev);
 
 	return add_uevent_var(env, "MODALIAS=slim:%s", dev_name(&sbdev->dev));
 }

drivers/soc/imx/gpcv2.c

···
 		domain->genpd.power_off = imx_pgc_power_down;
 
 		pd_pdev->dev.parent = dev;
-		pd_pdev->dev.of_node = np;
+		device_set_node(&pd_pdev->dev, of_fwnode_handle(np));
 
 		ret = platform_device_add(pd_pdev);
 		if (ret) {

drivers/soc/qcom/apr.c

···
 	spin_unlock(&apr->svcs_lock);
 }
 
-static int apr_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int apr_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
-	struct apr_device *adev = to_apr_device(dev);
+	const struct apr_device *adev = to_apr_device(dev);
 	int ret;
 
 	ret = of_device_uevent_modalias(dev, env);

drivers/soc/renesas/rcar-sysc.c

···
 
 	error = of_genpd_add_provider_onecell(np, &domains->onecell_data);
 	if (!error)
-		of_node_set_flag(np, OF_POPULATED);
+		fwnode_dev_initialized(of_fwnode_handle(np), true);
 
 out_put:
 	of_node_put(np);

drivers/soundwire/bus_type.c

···
 			slave->id.sdw_version, slave->id.class_id);
 }
 
-int sdw_slave_uevent(struct device *dev, struct kobj_uevent_env *env)
+int sdw_slave_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
-	struct sdw_slave *slave = dev_to_sdw_dev(dev);
+	const struct sdw_slave *slave = dev_to_sdw_dev(dev);
 	char modalias[32];
 
 	sdw_slave_modalias(slave, modalias, sizeof(modalias));

drivers/spi/spi.c

···
 	return strcmp(spi->modalias, drv->name) == 0;
 }
 
-static int spi_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int spi_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
 	const struct spi_device		*spi = to_spi_device(dev);
 	int rc;

drivers/spmi/spmi.c

···
 		sdrv->shutdown(to_spmi_device(dev));
 }
 
-static int spmi_drv_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int spmi_drv_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
 	int ret;
 

drivers/ssb/main.c

···
 	return 0;
 }
 
-static int ssb_device_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int ssb_device_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
-	struct ssb_device *ssb_dev = dev_to_ssb_dev(dev);
+	const struct ssb_device *ssb_dev = dev_to_ssb_dev(dev);
 
 	if (!dev)
 		return -ENODEV;

drivers/staging/greybus/audio_codec.c

···
 			gbaudio_dai, ARRAY_SIZE(gbaudio_dai));
 }
 
-static int gbaudio_codec_remove(struct platform_device *pdev)
-{
-	return 0;
-}
-
 static const struct of_device_id greybus_asoc_machine_of_match[]  = {
 	{ .compatible = "toshiba,apb-dummy-codec", },
 	{},
···
 		.of_match_table = greybus_asoc_machine_of_match,
 	},
 	.probe = gbaudio_codec_probe,
-	.remove = gbaudio_codec_remove,
 };
 module_platform_driver(gbaudio_codec_driver);
 

drivers/staging/greybus/gbphy.c

···
 	.pm	=	&gb_gbphy_pm_ops,
 };
 
-static int gbphy_dev_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int gbphy_dev_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
-	struct gbphy_device *gbphy_dev = to_gbphy_dev(dev);
-	struct greybus_descriptor_cport *cport_desc = gbphy_dev->cport_desc;
-	struct gb_bundle *bundle = gbphy_dev->bundle;
-	struct gb_interface *intf = bundle->intf;
-	struct gb_module *module = intf->module;
-	struct gb_host_device *hd = intf->hd;
+	const struct gbphy_device *gbphy_dev = to_gbphy_dev(dev);
+	const struct greybus_descriptor_cport *cport_desc = gbphy_dev->cport_desc;
+	const struct gb_bundle *bundle = gbphy_dev->bundle;
+	const struct gb_interface *intf = bundle->intf;
+	const struct gb_module *module = intf->module;
+	const struct gb_host_device *hd = intf->hd;
 
 	if (add_uevent_var(env, "BUS=%u", hd->bus_id))
 		return -ENOMEM;

drivers/tee/tee_core.c

···
 	return 0;
 }
 
-static int tee_client_device_uevent(struct device *dev,
+static int tee_client_device_uevent(const struct device *dev,
 				    struct kobj_uevent_env *env)
 {
 	uuid_t *dev_id = &to_tee_client_device(dev)->id.uuid;

drivers/thunderbolt/switch.c

···
 	kfree(sw);
 }
 
-static int tb_switch_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int tb_switch_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
-	struct tb_switch *sw = tb_to_switch(dev);
+	const struct tb_switch *sw = tb_to_switch(dev);
 	const char *type;
 
 	if (sw->config.thunderbolt_version == USB4_VERSION_1_0) {

drivers/thunderbolt/tb.h

···
 	return dev->type == &tb_switch_type;
 }
 
-static inline struct tb_switch *tb_to_switch(struct device *dev)
+static inline struct tb_switch *tb_to_switch(const struct device *dev)
 {
 	if (tb_is_switch(dev))
 		return container_of(dev, struct tb_switch, dev);

drivers/thunderbolt/xdomain.c

···
 }
 static DEVICE_ATTR_RO(key);
 
-static int get_modalias(struct tb_service *svc, char *buf, size_t size)
+static int get_modalias(const struct tb_service *svc, char *buf, size_t size)
 {
 	return snprintf(buf, size, "tbsvc:k%sp%08Xv%08Xr%08X", svc->key,
 			svc->prtcid, svc->prtcvers, svc->prtcrevs);
···
 	NULL,
 };
 
-static int tb_service_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int tb_service_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
-	struct tb_service *svc = container_of(dev, struct tb_service, dev);
+	const struct tb_service *svc = container_of_const(dev, struct tb_service, dev);
 	char modalias[64];
 
 	get_modalias(svc, modalias, sizeof(modalias));

drivers/tty/serdev/core.c

···
 };
 ATTRIBUTE_GROUPS(serdev_device);
 
-static int serdev_device_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int serdev_device_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
 	int rc;
 

drivers/tty/serial/arc_uart.c

···
 	return uart_add_one_port(&arc_uart_driver, &arc_uart_ports[dev_id].port);
 }
 
-static int arc_serial_remove(struct platform_device *pdev)
-{
-	/* This will never be called */
-	return 0;
-}
-
 static const struct of_device_id arc_uart_dt_ids[] = {
 	{ .compatible = "snps,arc-uart" },
 	{ /* Sentinel */ }
···
 
 static struct platform_driver arc_platform_driver = {
 	.probe = arc_serial_probe,
-	.remove = arc_serial_remove,
 	.driver = {
 		.name = DRIVER_NAME,
 		.of_match_table  = arc_uart_dt_ids,

drivers/usb/common/ulpi.c

···
 	return 0;
 }
 
-static int ulpi_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int ulpi_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
-	struct ulpi *ulpi = to_ulpi_dev(dev);
+	const struct ulpi *ulpi = to_ulpi_dev(dev);
 	int ret;
 
 	ret = of_device_uevent_modalias(dev, env);

drivers/usb/core/driver.c

···
 	return 0;
 }
 
-static int usb_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int usb_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
-	struct usb_device *usb_dev;
+	const struct usb_device *usb_dev;
 
 	if (is_usb_device(dev)) {
 		usb_dev = to_usb_device(dev);
 	} else if (is_usb_interface(dev)) {
-		struct usb_interface *intf = to_usb_interface(dev);
+		const struct usb_interface *intf = to_usb_interface(dev);
 
 		usb_dev = interface_to_usbdev(intf);
 	} else {

drivers/usb/core/message.c

···
 	}
 }
 
-static int usb_if_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int usb_if_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
-	struct usb_device *usb_dev;
-	struct usb_interface *intf;
-	struct usb_host_interface *alt;
+	const struct usb_device *usb_dev;
+	const struct usb_interface *intf;
+	const struct usb_host_interface *alt;
 
 	intf = to_usb_interface(dev);
 	usb_dev = interface_to_usbdev(intf);

drivers/usb/core/usb.c

···
 	kfree(udev);
 }
 
-static int usb_dev_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int usb_dev_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
-	struct usb_device *usb_dev;
+	const struct usb_device *usb_dev;
 
 	usb_dev = to_usb_device(dev);
 
···
 #endif	/* CONFIG_PM */
 
 
-static char *usb_devnode(struct device *dev,
+static char *usb_devnode(const struct device *dev,
 			 umode_t *mode, kuid_t *uid, kgid_t *gid)
 {
-	struct usb_device *usb_dev;
+	const struct usb_device *usb_dev;
 
 	usb_dev = to_usb_device(dev);
 	return kasprintf(GFP_KERNEL, "bus/usb/%03d/%03d",

drivers/usb/phy/phy.c

···
 	return ERR_PTR(-EPROBE_DEFER);
 }
 
-static struct usb_phy *__device_to_usb_phy(struct device *dev)
+static struct usb_phy *__device_to_usb_phy(const struct device *dev)
 {
 	struct usb_phy *usb_phy;
 
···
 	kobject_uevent(&usb_phy->dev->kobj, KOBJ_CHANGE);
 }
 
-static int usb_phy_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int usb_phy_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
-	struct usb_phy *usb_phy;
+	const struct usb_phy *usb_phy;
 	char uchger_state[50] = { 0 };
 	char uchger_type[50] = { 0 };
 	unsigned long flags;

drivers/usb/roles/class.c

···
 	NULL,
 };
 
-static int
-usb_role_switch_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int usb_role_switch_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
 	int ret;
 

drivers/usb/typec/bus.c

···
 	return 0;
 }
 
-static int typec_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int typec_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
-	struct typec_altmode *altmode = to_typec_altmode(dev);
+	const struct typec_altmode *altmode = to_typec_altmode(dev);
 
 	if (add_uevent_var(env, "SVID=%04X", altmode->svid))
 		return -ENOMEM;

drivers/usb/typec/class.c

···
 	NULL
 };
 
-static int typec_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int typec_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
 	int ret;
 

drivers/virtio/virtio.c

···
 	return 0;
 }
 
-static int virtio_uevent(struct device *_dv, struct kobj_uevent_env *env)
+static int virtio_uevent(const struct device *_dv, struct kobj_uevent_env *env)
 {
-	struct virtio_device *dev = dev_to_virtio(_dv);
+	const struct virtio_device *dev = dev_to_virtio(_dv);
 
 	return add_uevent_var(env, "MODALIAS=virtio:d%08Xv%08X",
 			      dev->id.device, dev->id.vendor);

drivers/w1/w1.c

···
 	.fops = &w1_default_fops,
 };
 
-static int w1_uevent(struct device *dev, struct kobj_uevent_env *env);
+static int w1_uevent(const struct device *dev, struct kobj_uevent_env *env);
 
 static struct bus_type w1_bus_type = {
 	.name = "w1",
···
 	sysfs_remove_group(&master->dev.kobj, &w1_master_defattr_group);
 }
 
-static int w1_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int w1_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
-	struct w1_master *md = NULL;
-	struct w1_slave *sl = NULL;
-	char *event_owner, *name;
+	const struct w1_master *md = NULL;
+	const struct w1_slave *sl = NULL;
+	const char *event_owner, *name;
 	int err = 0;
 
 	if (dev->driver == &w1_master_driver) {

drivers/xen/pvcalls-back.c

···
 {
 }
 
-static int pvcalls_back_uevent(struct xenbus_device *xdev,
+static int pvcalls_back_uevent(const struct xenbus_device *xdev,
 			       struct kobj_uevent_env *env)
 {
 	return 0;

drivers/xen/xenbus/xenbus_probe_backend.c

···
 	return 0;
 }
 
-static int xenbus_uevent_backend(struct device *dev,
+static int xenbus_uevent_backend(const struct device *dev,
 				 struct kobj_uevent_env *env)
 {
-	struct xenbus_device *xdev;
-	struct xenbus_driver *drv;
-	struct xen_bus_type *bus;
+	const struct xenbus_device *xdev;
+	const struct xenbus_driver *drv;
+	const struct xen_bus_type *bus;
 
 	DPRINTK("");
 

drivers/xen/xenbus/xenbus_probe_frontend.c

···
 	return err;
 }
 
-static int xenbus_uevent_frontend(struct device *_dev,
+static int xenbus_uevent_frontend(const struct device *_dev,
 				  struct kobj_uevent_env *env)
 {
-	struct xenbus_device *dev = to_xenbus_device(_dev);
+	const struct xenbus_device *dev = to_xenbus_device(_dev);
 
 	if (add_uevent_var(env, "MODALIAS=xen:%s", dev->devicetype))
 		return -ENOMEM;

drivers/zorro/zorro-driver.c

···
 	return !!zorro_match_device(ids, z);
 }
 
-static int zorro_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int zorro_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
-	struct zorro_dev *z;
+	const struct zorro_dev *z;
 
 	if (!dev)
 		return -ENODEV;

fs/debugfs/inode.c

···
  * exist for rename to succeed.
  *
  * This function will return a pointer to old_dentry (which is updated to
- * reflect renaming) if it succeeds. If an error occurs, %NULL will be
- * returned.
+ * reflect renaming) if it succeeds. If an error occurs, ERR_PTR(-ERROR)
+ * will be returned.
  *
  * If debugfs is not enabled in the kernel, the value -%ENODEV will be
  * returned.

fs/dlm/lockspace.c

···
 	return ls->ls_uevent_result;
 }
 
-static int dlm_uevent(struct kobject *kobj, struct kobj_uevent_env *env)
+static int dlm_uevent(const struct kobject *kobj, struct kobj_uevent_env *env)
 {
-	struct dlm_ls *ls = container_of(kobj, struct dlm_ls, ls_kobj);
+	const struct dlm_ls *ls = container_of(kobj, struct dlm_ls, ls_kobj);
 
 	add_uevent_var(env, "LOCKSPACE=%s", ls->ls_name);
 	return 0;

fs/gfs2/sys.c

···
 	wait_for_completion(&sdp->sd_kobj_unregister);
 }
 
-static int gfs2_uevent(struct kobject *kobj, struct kobj_uevent_env *env)
+static int gfs2_uevent(const struct kobject *kobj, struct kobj_uevent_env *env)
 {
-	struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
-	struct super_block *s = sdp->sd_vfs;
+	const struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
+	const struct super_block *s = sdp->sd_vfs;
 
 	add_uevent_var(env, "LOCKTABLE=%s", sdp->sd_table_name);
 	add_uevent_var(env, "LOCKPROTO=%s", sdp->sd_proto_name);

fs/kernfs/dir.c

···
 	if (kn_from == kn_to)
 		return strlcpy(buf, "/", buflen);
 
-	if (!buf)
-		return -EINVAL;
-
 	common = kernfs_common_ancestor(kn_from, kn_to);
 	if (WARN_ON(!common))
 		return -EINVAL;

include/asm-generic/dma-mapping.h

···
 #ifndef _ASM_GENERIC_DMA_MAPPING_H
 #define _ASM_GENERIC_DMA_MAPPING_H
 
-static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
+static inline const struct dma_map_ops *get_arch_dma_ops(void)
 {
 	return NULL;
 }

include/drm/drm_mipi_dsi.h

···
 
 #define MIPI_DSI_MODULE_PREFIX "mipi-dsi:"
 
-static inline struct mipi_dsi_device *to_mipi_dsi_device(struct device *dev)
-{
-	return container_of(dev, struct mipi_dsi_device, dev);
-}
+#define to_mipi_dsi_device(__dev)	container_of_const(__dev, struct mipi_dsi_device, dev)
 
 /**
  * mipi_dsi_pixel_format_to_bpp - obtain the number of bits per pixel for any

include/linux/acpi.h

···
 const void *acpi_device_get_match_data(const struct device *dev);
 extern bool acpi_driver_match_device(struct device *dev,
 				     const struct device_driver *drv);
-int acpi_device_uevent_modalias(struct device *, struct kobj_uevent_env *);
+int acpi_device_uevent_modalias(const struct device *, struct kobj_uevent_env *);
 int acpi_device_modalias(struct device *, char *, int);
 
 struct platform_device *acpi_create_platform_device(struct acpi_device *,
···
 	return NULL;
 }
 
-static inline int acpi_device_uevent_modalias(struct device *dev,
+static inline int acpi_device_uevent_modalias(const struct device *dev,
 				struct kobj_uevent_env *env)
 {
 	return -ENODEV;

include/linux/cacheinfo.h

···
 
 struct cpu_cacheinfo *get_cpu_cacheinfo(unsigned int cpu);
 int init_cache_level(unsigned int cpu);
+int init_of_cache_level(unsigned int cpu);
 int populate_cache_leaves(unsigned int cpu);
 int cache_setup_acpi(unsigned int cpu);
 bool last_level_cache_is_valid(unsigned int cpu);
 bool last_level_cache_is_shared(unsigned int cpu_x, unsigned int cpu_y);
+int fetch_cache_info(unsigned int cpu);
 int detect_cache_attributes(unsigned int cpu);
 #ifndef CONFIG_ACPI_PPTT
 /*
- * acpi_find_last_cache_level is only called on ACPI enabled
+ * acpi_get_cache_info() is only called on ACPI enabled
  * platforms using the PPTT for topology. This means that if
  * the platform supports other firmware configuration methods
  * we need to stub out the call when ACPI is disabled.
  * ACPI enabled platforms not using PPTT won't be making calls
  * to this function so we need not worry about them.
  */
-static inline int acpi_find_last_cache_level(unsigned int cpu)
+static inline
+int acpi_get_cache_info(unsigned int cpu,
+			unsigned int *levels, unsigned int *split_levels)
 {
-	return 0;
+	return -ENOENT;
 }
 #else
-int acpi_find_last_cache_level(unsigned int cpu);
+int acpi_get_cache_info(unsigned int cpu,
+			unsigned int *levels, unsigned int *split_levels);
 #endif
 
 const struct attribute_group *cache_get_priv_group(struct cacheinfo *this_leaf);

include/linux/container_of.h

···
 #define _LINUX_CONTAINER_OF_H
 
 #include <linux/build_bug.h>
-#include <linux/err.h>
+#include <linux/stddef.h>
 
 #define typeof_member(T, m)	typeof(((T*)0)->m)
 

include/linux/device.h

···
 struct device_type {
 	const char *name;
 	const struct attribute_group **groups;
-	int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
-	char *(*devnode)(struct device *dev, umode_t *mode,
+	int (*uevent)(const struct device *dev, struct kobj_uevent_env *env);
+	char *(*devnode)(const struct device *dev, umode_t *mode,
 			 kuid_t *uid, kgid_t *gid);
 	void (*release)(struct device *dev);
 
···
 #define DL_FLAG_MANAGED			BIT(6)
 #define DL_FLAG_SYNC_STATE_ONLY		BIT(7)
 #define DL_FLAG_INFERRED		BIT(8)
+#define DL_FLAG_CYCLE			BIT(9)
 
 /**
  * enum dl_dev_state - Device driver presence tracking information.
···
 int device_move(struct device *dev, struct device *new_parent,
 		enum dpm_order dpm_order);
 int device_change_owner(struct device *dev, kuid_t kuid, kgid_t kgid);
-const char *device_get_devnode(struct device *dev, umode_t *mode, kuid_t *uid,
-			       kgid_t *gid, const char **tmp);
 int device_is_dependent(struct device *dev, void *target);
 
 static inline bool device_supports_offline(struct device *dev)

include/linux/device/bus.h

···
  * @iommu_ops:  IOMMU specific operations for this bus, used to attach IOMMU
  *              driver implementations to a bus and allow the driver to do
  *              bus-specific setup
- * @p:		The private data of the driver core, only the driver core can
- *		touch this.
  * @lock_key:	Lock class key for use by the lock validator
  * @need_parent_lock:	When probing or removing a device on this bus, the
  *			device core should lock the device's parent.
···
 	const struct attribute_group **drv_groups;
 
 	int (*match)(struct device *dev, struct device_driver *drv);
-	int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
+	int (*uevent)(const struct device *dev, struct kobj_uevent_env *env);
 	int (*probe)(struct device *dev);
 	void (*sync_state)(struct device *dev);
 	void (*remove)(struct device *dev);
···
 
 	const struct iommu_ops *iommu_ops;
 
-	struct subsys_private *p;
-	struct lock_class_key lock_key;
-
 	bool need_parent_lock;
 };
 
 extern int __must_check bus_register(struct bus_type *bus);
 
-extern void bus_unregister(struct bus_type *bus);
+extern void bus_unregister(const struct bus_type *bus);
 
 extern int __must_check bus_rescan_devices(struct bus_type *bus);
 
···
 #define BUS_ATTR_WO(_name) \
 	struct bus_attribute bus_attr_##_name = __ATTR_WO(_name)
 
-extern int __must_check bus_create_file(struct bus_type *,
-					struct bus_attribute *);
-extern void bus_remove_file(struct bus_type *, struct bus_attribute *);
+int __must_check bus_create_file(const struct bus_type *bus, struct bus_attribute *attr);
+void bus_remove_file(const struct bus_type *bus, struct bus_attribute *attr);
 
 /* Generic device matching functions that all busses can use to match with */
 int device_match_name(struct device *dev, const void *name);
···
 int device_match_any(struct device *dev, const void *unused);
 
 /* iterator helpers for buses */
-struct subsys_dev_iter {
-	struct klist_iter		ki;
-	const struct device_type	*type;
-};
-void subsys_dev_iter_init(struct subsys_dev_iter *iter,
-			 struct bus_type *subsys,
-			 struct device *start,
-			 const struct device_type *type);
-struct device *subsys_dev_iter_next(struct subsys_dev_iter *iter);
-void subsys_dev_iter_exit(struct subsys_dev_iter *iter);
-
-int bus_for_each_dev(struct bus_type *bus, struct device *start, void *data,
+int bus_for_each_dev(const struct bus_type *bus, struct device *start, void *data,
 		     int (*fn)(struct device *dev, void *data));
-struct device *bus_find_device(struct bus_type *bus, struct device *start,
+struct device *bus_find_device(const struct bus_type *bus, struct device *start,
 			       const void *data,
 			       int (*match)(struct device *dev, const void *data));
 /**
···
  * @start: Device to begin with
  * @name: name of the device to match
  */
-static inline struct device *bus_find_device_by_name(struct bus_type *bus,
+static inline struct device *bus_find_device_by_name(const struct bus_type *bus,
 						     struct device *start,
 						     const char *name)
 {
···
  * @np: of_node of the device to match.
  */
 static inline struct device *
-bus_find_device_by_of_node(struct bus_type *bus, const struct device_node *np)
+bus_find_device_by_of_node(const struct bus_type *bus, const struct device_node *np)
 {
 	return bus_find_device(bus, NULL, np, device_match_of_node);
 }
···
  * @fwnode: fwnode of the device to match.
  */
 static inline struct device *
-bus_find_device_by_fwnode(struct bus_type *bus, const struct fwnode_handle *fwnode)
+bus_find_device_by_fwnode(const struct bus_type *bus, const struct fwnode_handle *fwnode)
 {
 	return bus_find_device(bus, NULL, fwnode, device_match_fwnode);
 }
···
  * @bus: bus type
  * @devt: device type of the device to match.
  */
-static inline struct device *bus_find_device_by_devt(struct bus_type *bus,
+static inline struct device *bus_find_device_by_devt(const struct bus_type *bus,
 						     dev_t devt)
 {
 	return bus_find_device(bus, NULL, &devt, device_match_devt);
···
  * @cur: device to begin the search with.
  */
 static inline struct device *
-bus_find_next_device(struct bus_type *bus,struct device *cur)
+bus_find_next_device(const struct bus_type *bus,struct device *cur)
 {
 	return bus_find_device(bus, cur, NULL, device_match_any);
 }
···
  * @adev: ACPI COMPANION device to match.
  */
 static inline struct device *
-bus_find_device_by_acpi_dev(struct bus_type *bus, const struct acpi_device *adev)
+bus_find_device_by_acpi_dev(const struct bus_type *bus, const struct acpi_device *adev)
 {
 	return bus_find_device(bus, NULL, adev, device_match_acpi_dev);
 }
 #else
 static inline struct device *
-bus_find_device_by_acpi_dev(struct bus_type *bus, const void *adev)
+bus_find_device_by_acpi_dev(const struct bus_type *bus, const void *adev)
 {
 	return NULL;
 }
 #endif
 
-struct device *subsys_find_device_by_id(struct bus_type *bus, unsigned int id,
-					struct device *hint);
-int bus_for_each_drv(struct bus_type *bus, struct device_driver *start,
+int bus_for_each_drv(const struct bus_type *bus, struct device_driver *start,
 		     void *data, int (*fn)(struct device_driver *, void *));
 void bus_sort_breadthfirst(struct bus_type *bus,
 			   int (*compare)(const struct device *a,
···
  */
 struct notifier_block;
 
-extern int bus_register_notifier(struct bus_type *bus,
+extern int bus_register_notifier(const struct bus_type *bus,
 				 struct notifier_block *nb);
-extern int bus_unregister_notifier(struct bus_type *bus,
+extern int bus_unregister_notifier(const struct bus_type *bus,
 				   struct notifier_block *nb);
 
-/* All 4 notifers below get called with the target struct device *
- * as an argument. Note that those functions are likely to be called
- * with the device lock held in the core, so be careful.
+/**
+ * enum bus_notifier_event - Bus Notifier events that have happened
+ * @BUS_NOTIFY_ADD_DEVICE: device is added to this bus
+ * @BUS_NOTIFY_DEL_DEVICE: device is about to be removed from this bus
+ * @BUS_NOTIFY_REMOVED_DEVICE: device is successfully removed from this bus
+ * @BUS_NOTIFY_BIND_DRIVER: a driver is about to be bound to this device on this bus
+ * @BUS_NOTIFY_BOUND_DRIVER: a driver is successfully bound to this device on this bus
+ * @BUS_NOTIFY_UNBIND_DRIVER: a driver is about to be unbound from this device on this bus
+ * @BUS_NOTIFY_UNBOUND_DRIVER: a driver is successfully unbound from this device on this bus
+ * @BUS_NOTIFY_DRIVER_NOT_BOUND: a driver failed to be bound to this device on this bus
+ *
+ * These are the value passed to a bus notifier when a specific event happens.
+ *
+ * Note that bus notifiers are likely to be called with the device lock already
+ * held by the driver core, so be careful in any notifier callback as to what
+ * you do with the device structure.
+ *
+ * All bus notifiers are called with the target struct device * as an argument.
  */
-#define BUS_NOTIFY_ADD_DEVICE		0x00000001 /* device added */
-#define BUS_NOTIFY_DEL_DEVICE		0x00000002 /* device to be removed */
-#define BUS_NOTIFY_REMOVED_DEVICE	0x00000003 /* device removed */
-#define BUS_NOTIFY_BIND_DRIVER		0x00000004 /* driver about to be
-						      bound */
-#define BUS_NOTIFY_BOUND_DRIVER		0x00000005 /* driver bound to device */
-#define BUS_NOTIFY_UNBIND_DRIVER	0x00000006 /* driver about to be
-						      unbound */
-#define BUS_NOTIFY_UNBOUND_DRIVER	0x00000007 /* driver is unbound
-						      from the device */
-#define BUS_NOTIFY_DRIVER_NOT_BOUND	0x00000008 /* driver fails to be bound */
+enum bus_notifier_event {
+	BUS_NOTIFY_ADD_DEVICE,
+	BUS_NOTIFY_DEL_DEVICE,
+	BUS_NOTIFY_REMOVED_DEVICE,
+	BUS_NOTIFY_BIND_DRIVER,
+	BUS_NOTIFY_BOUND_DRIVER,
+	BUS_NOTIFY_UNBIND_DRIVER,
+	BUS_NOTIFY_UNBOUND_DRIVER,
+	BUS_NOTIFY_DRIVER_NOT_BOUND,
+};
 
-extern struct kset *bus_get_kset(struct bus_type *bus);
-extern struct klist *bus_get_device_klist(struct bus_type *bus);
+extern struct kset *bus_get_kset(const struct bus_type *bus);
+struct device *bus_get_dev_root(const struct bus_type *bus);
 
 #endif

include/linux/device/driver.h

···
 }
 #endif
 
-extern int driver_deferred_probe_timeout;
 void driver_deferred_probe_add(struct device *dev);
 int driver_deferred_probe_check_state(struct device *dev);
 void driver_init(void);

include/linux/dma-map-ops.h

···
 {
 	if (dev->dma_ops)
 		return dev->dma_ops;
-	return get_arch_dma_ops(dev->bus);
+	return get_arch_dma_ops();
 }
 
 static inline void set_dma_ops(struct device *dev,

include/linux/firewire.h

···
 	struct fw_attribute_group attribute_group;
 };
 
-static inline struct fw_device *fw_device(struct device *dev)
-{
-	return container_of(dev, struct fw_device, device);
-}
+#define fw_device(dev)	container_of_const(dev, struct fw_device, device)
 
 static inline int fw_device_is_shutdown(struct fw_device *device)
 {
···
 	struct fw_attribute_group attribute_group;
 };
 
-static inline struct fw_unit *fw_unit(struct device *dev)
-{
-	return container_of(dev, struct fw_unit, device);
-}
+#define fw_unit(dev)	container_of_const(dev, struct fw_unit, device)
 
 static inline struct fw_unit *fw_unit_get(struct fw_unit *unit)
 {
···
 	put_device(&unit->device);
 }
 
-static inline struct fw_device *fw_parent_device(struct fw_unit *unit)
-{
-	return fw_device(unit->device.parent);
-}
+#define fw_parent_device(unit)	fw_device(unit->device.parent)
 
 struct ieee1394_device_id;
 

include/linux/fwnode.h

···
 struct device;
 
 /*
- * fwnode link flags
+ * fwnode flags
  *
  * LINKS_ADDED:	The fwnode has already be parsed to add fwnode links.
  * NOT_DEVICE:	The fwnode will never be populated as a struct device.
···
 #define FWNODE_FLAG_INITIALIZED			BIT(2)
 #define FWNODE_FLAG_NEEDS_CHILD_BOUND_ON_ADD	BIT(3)
 #define FWNODE_FLAG_BEST_EFFORT			BIT(4)
+#define FWNODE_FLAG_VISITED			BIT(5)
 
 struct fwnode_handle {
 	struct fwnode_handle *secondary;
···
 	u8 flags;
 };
 
+/*
+ * fwnode link flags
+ *
+ * CYCLE:	The fwnode link is part of a cycle. Don't defer probe.
+ */
+#define FWLINK_FLAG_CYCLE			BIT(0)
+
 struct fwnode_link {
 	struct fwnode_handle *supplier;
 	struct list_head s_hook;
 	struct fwnode_handle *consumer;
 	struct list_head c_hook;
+	u8 flags;
 };
 
 /**
···
 		fwnode->flags &= ~FWNODE_FLAG_INITIALIZED;
 }
 
-extern u32 fw_devlink_get_flags(void);
 extern bool fw_devlink_is_strict(void);
 int fwnode_link_add(struct fwnode_handle *con, struct fwnode_handle *sup);
 void fwnode_links_purge(struct fwnode_handle *fwnode);

include/linux/hyperv.h

···
 };
 
 
-static inline struct hv_device *device_to_hv_device(struct device *d)
-{
-	return container_of(d, struct hv_device, device);
-}
+#define device_to_hv_device(d)	container_of_const(d, struct hv_device, device)
 
 static inline struct hv_driver *drv_to_hv_drv(struct device_driver *d)
 {

include/linux/i3c/device.h

···
 /**
  * enum i3c_error_code - I3C error codes
  *
+ * @I3C_ERROR_UNKNOWN: unknown error, usually means the error is not I3C
+ *		       related
+ * @I3C_ERROR_M0: M0 error
+ * @I3C_ERROR_M1: M1 error
+ * @I3C_ERROR_M2: M2 error
+ *
  * These are the standard error codes as defined by the I3C specification.
  * When -EIO is returned by the i3c_device_do_priv_xfers() or
  * i3c_device_send_hdr_cmds() one can check the error code in
  * &struct_i3c_priv_xfer.err or &struct i3c_hdr_cmd.err to get a better idea of
  * what went wrong.
  *
- * @I3C_ERROR_UNKNOWN: unknown error, usually means the error is not I3C
- *		       related
- * @I3C_ERROR_M0: M0 error
- * @I3C_ERROR_M1: M1 error
- * @I3C_ERROR_M2: M2 error
  */
 enum i3c_error_code {
 	I3C_ERROR_UNKNOWN = 0,
···
 }
 
 struct device *i3cdev_to_dev(struct i3c_device *i3cdev);
-struct i3c_device *dev_to_i3cdev(struct device *dev);
+
+/**
+ * dev_to_i3cdev() - Returns the I3C device containing @dev
+ * @__dev: device object
+ *
+ * Return: a pointer to an I3C device object.
+ */
+#define dev_to_i3cdev(__dev)	container_of_const(__dev, struct i3c_device, dev)
 
 const struct i3c_device_id *
 i3c_device_match_id(struct i3c_device *i3cdev,
···
 
 int i3c_device_do_setdasa(struct i3c_device *dev);
 
-void i3c_device_get_info(struct i3c_device *dev, struct i3c_device_info *info);
+void i3c_device_get_info(const struct i3c_device *dev, struct i3c_device_info *info);
 
 struct i3c_ibi_payload {
 	unsigned int len;

include/linux/kobject.h

···
 struct kset_uevent_ops {
 	int (* const filter)(const struct kobject *kobj);
 	const char *(* const name)(const struct kobject *kobj);
-	int (* const uevent)(struct kobject *kobj, struct kobj_uevent_env *env);
+	int (* const uevent)(const struct kobject *kobj, struct kobj_uevent_env *env);
 };
 
 struct kobj_attribute {

include/linux/mcb.h

···
 	struct device *dma_dev;
 };
 
-static inline struct mcb_device *to_mcb_device(struct device *dev)
-{
-	return container_of(dev, struct mcb_device, dev);
-}
+#define to_mcb_device(__dev)	container_of_const(__dev, struct mcb_device, dev)
 
 /**
  * struct mcb_driver - MEN Chameleon Bus device driver

include/linux/of_device.h

···
 extern int of_device_request_module(struct device *dev);
 
 extern void of_device_uevent(const struct device *dev, struct kobj_uevent_env *env);
-extern int of_device_uevent_modalias(struct device *dev, struct kobj_uevent_env *env);
+extern int of_device_uevent_modalias(const struct device *dev, struct kobj_uevent_env *env);
 
 static inline struct device_node *of_cpu_device_node_get(int cpu)
 {
···
 	return -ENODEV;
 }
 
-static inline int of_device_uevent_modalias(struct device *dev,
+static inline int of_device_uevent_modalias(const struct device *dev,
 				   struct kobj_uevent_env *env)
 {
 	return -ENODEV;

include/linux/platform_device.h

···
 
 struct platform_driver {
 	int (*probe)(struct platform_device *);
+
+	/*
+	 * Traditionally the remove callback returned an int which however is
+	 * ignored by the driver core. This led to wrong expectations by driver
+	 * authors who thought returning an error code was a valid error
+	 * handling strategy. To convert to a callback returning void, new
+	 * drivers should implement .remove_new() until the conversion it done
+	 * that eventually makes .remove() return void.
+	 */
 	int (*remove)(struct platform_device *);
+	void (*remove_new)(struct platform_device *);
+
 	void (*shutdown)(struct platform_device *);
 	int (*suspend)(struct platform_device *, pm_message_t state);
 	int (*resume)(struct platform_device *);

include/linux/property.h

···
 unsigned int fwnode_graph_get_endpoint_count(struct fwnode_handle *fwnode,
 					     unsigned long flags);
 
-#define fwnode_graph_for_each_endpoint(fwnode, child)			\
-	for (child = NULL;						\
-	     (child = fwnode_graph_get_next_endpoint(fwnode, child)); )
+#define fwnode_graph_for_each_endpoint(fwnode, child)				\
+	for (child = fwnode_graph_get_next_endpoint(fwnode, NULL); child;	\
+	     child = fwnode_graph_get_next_endpoint(fwnode, child))
 
 int fwnode_graph_parse_endpoint(const struct fwnode_handle *fwnode,
 				struct fwnode_endpoint *endpoint);
···
 const struct software_node *
 software_node_find_by_name(const struct software_node *parent,
 			   const char *name);
-
-int software_node_register_nodes(const struct software_node *nodes);
-void software_node_unregister_nodes(const struct software_node *nodes);
 
 int software_node_register_node_group(const struct software_node **node_group);
 void software_node_unregister_node_group(const struct software_node **node_group);

include/linux/soundwire/sdw_type.h

···
 int __sdw_register_driver(struct sdw_driver *drv, struct module *owner);
 void sdw_unregister_driver(struct sdw_driver *drv);
 
-int sdw_slave_uevent(struct device *dev, struct kobj_uevent_env *env);
+int sdw_slave_uevent(const struct device *dev, struct kobj_uevent_env *env);
 
 /**
  * module_sdw_driver() - Helper macro for registering a Soundwire driver

include/linux/spi/spi.h

···
 static_assert((SPI_MODE_KERNEL_MASK & SPI_MODE_USER_MASK) == 0,
 	      "SPI_MODE_USER_MASK & SPI_MODE_KERNEL_MASK must not overlap");
 
-static inline struct spi_device *to_spi_device(struct device *dev)
+static inline struct spi_device *to_spi_device(const struct device *dev)
 {
 	return dev ? container_of(dev, struct spi_device, dev) : NULL;
 }

include/linux/ssb/ssb.h

···
 
 /* Go from struct device to struct ssb_device. */
 static inline
-struct ssb_device * dev_to_ssb_dev(struct device *dev)
+struct ssb_device * dev_to_ssb_dev(const struct device *dev)
 {
 	struct __ssb_dev_wrapper *wrap;
 	wrap = container_of(dev, struct __ssb_dev_wrapper, dev);

include/linux/surface_aggregator/device.h

···
  * Return: Returns a pointer to the &struct ssam_device wrapping the given
  * device @d.
  */
-static inline struct ssam_device *to_ssam_device(struct device *d)
-{
-	return container_of(d, struct ssam_device, dev);
-}
+#define to_ssam_device(d)	container_of_const(d, struct ssam_device, dev)
 
 /**
  * to_ssam_device_driver() - Casts the given device driver to a SSAM client

include/linux/transport_class.h

···
 static inline int
 transport_register_device(struct device *dev)
 {
+	int ret;
+
 	transport_setup_device(dev);
-	return transport_add_device(dev);
+	ret = transport_add_device(dev);
+	if (ret)
+		transport_destroy_device(dev);
+
+	return ret;
 }
 
 static inline void

include/linux/virtio.h

···
 	void *priv;
 };
 
-static inline struct virtio_device *dev_to_virtio(struct device *_dev)
-{
-	return container_of(_dev, struct virtio_device, dev);
-}
+#define dev_to_virtio(_dev)	container_of_const(_dev, struct virtio_device, dev)
 
 void virtio_add_status(struct virtio_device *dev, unsigned int status);
 int register_virtio_device(struct virtio_device *dev);

include/sound/hdaudio.h

···
 int snd_hdac_device_register(struct hdac_device *codec);
 void snd_hdac_device_unregister(struct hdac_device *codec);
 int snd_hdac_device_set_chip_name(struct hdac_device *codec, const char *name);
-int snd_hdac_codec_modalias(struct hdac_device *hdac, char *buf, size_t size);
+int snd_hdac_codec_modalias(const struct hdac_device *hdac, char *buf, size_t size);
 
 int snd_hdac_refresh_widgets(struct hdac_device *codec);
 

include/xen/xenbus.h

···
 	unsigned int spurious_threshold;
 };
 
-static inline struct xenbus_device *to_xenbus_device(struct device *dev)
-{
-	return container_of(dev, struct xenbus_device, dev);
-}
+#define to_xenbus_device(__dev)	container_of_const(__dev, struct xenbus_device, dev)
 
 struct xenbus_device_id
 {
···
 	void (*remove)(struct xenbus_device *dev);
 	int (*suspend)(struct xenbus_device *dev);
 	int (*resume)(struct xenbus_device *dev);
-	int (*uevent)(struct xenbus_device *, struct kobj_uevent_env *);
+	int (*uevent)(const struct xenbus_device *, struct kobj_uevent_env *);
 	struct device_driver driver;
 	int (*read_otherend_details)(struct xenbus_device *dev);
 	int (*is_ready)(struct xenbus_device *dev);

kernel/fail_function.c

···
 
 static void fei_debugfs_remove_attr(struct fei_attr *attr)
 {
-	struct dentry *dir;
-
-	dir = debugfs_lookup(attr->kp.symbol_name, fei_debugfs_dir);
-	debugfs_remove_recursive(dir);
+	debugfs_lookup_and_remove(attr->kp.symbol_name, fei_debugfs_dir);
 }
 
 static int fei_kprobe_handler(struct kprobe *kp, struct pt_regs *regs)

kernel/ksysfs.c

···
 }
 KERNEL_ATTR_RO(cpu_byteorder);
 
+/* address bits */
+static ssize_t address_bits_show(struct kobject *kobj,
+				 struct kobj_attribute *attr, char *buf)
+{
+	return sysfs_emit(buf, "%zu\n", sizeof(void *) * 8 /* CHAR_BIT */);
+}
+KERNEL_ATTR_RO(address_bits);
+
 #ifdef CONFIG_UEVENT_HELPER
 /* uevent helper program, used during early boot */
 static ssize_t uevent_helper_show(struct kobject *kobj,
···
 	&fscaps_attr.attr,
 	&uevent_seqnum_attr.attr,
 	&cpu_byteorder_attr.attr,
+	&address_bits_attr.attr,
 #ifdef CONFIG_UEVENT_HELPER
 	&uevent_helper_attr.attr,
 #endif

lib/kobject.c

···
 	return length;
 }
 
-static void fill_kobj_path(const struct kobject *kobj, char *path, int length)
+static int fill_kobj_path(const struct kobject *kobj, char *path, int length)
 {
 	const struct kobject *parent;
 
···
 		int cur = strlen(kobject_name(parent));
 		/* back up enough to print this name with '/' */
 		length -= cur;
+		if (length <= 0)
+			return -EINVAL;
 		memcpy(path + length, kobject_name(parent), cur);
 		*(path + --length) = '/';
 	}
 
 	pr_debug("kobject: '%s' (%p): %s: path = '%s'\n", kobject_name(kobj),
 		 kobj, __func__, path);
+
+	return 0;
 }
 
 /**
···
 	char *path;
 	int len;
 
+retry:
 	len = get_kobj_path_length(kobj);
 	if (len == 0)
 		return NULL;
 	path = kzalloc(len, gfp_mask);
 	if (!path)
 		return NULL;
-	fill_kobj_path(kobj, path, len);
+	if (fill_kobj_path(kobj, path, len)) {
+		kfree(path);
+		goto retry;
+	}
 
 	return path;
 }
···
 	kfree(kobj);
 }
 
-static struct kobj_type dynamic_kobj_ktype = {
+static const struct kobj_type dynamic_kobj_ktype = {
 	.release	= dynamic_kobj_release,
 	.sysfs_ops	= &kobj_sysfs_ops,
 };
···
 		kobject_get_ownership(kobj->parent, uid, gid);
 }
 
-static struct kobj_type kset_ktype = {
+static const struct kobj_type kset_ktype = {
 	.sysfs_ops	= &kobj_sysfs_ops,
 	.release	= kset_release,
 	.get_ownership	= kset_get_ownership,

lib/test_firmware.c

···
 #include <linux/slab.h>
 #include <linux/uaccess.h>
 #include <linux/delay.h>
+#include <linux/kstrtox.h>
 #include <linux/kthread.h>
 #include <linux/vmalloc.h>
 #include <linux/efi_embedded_fw.h>
···
 };
 
 /**
- * test_config - represents configuration for the test for different triggers
+ * struct test_config - represents configuration for the test for different triggers
  *
  * @name: the name of the firmware file to look for
  * @into_buf: when the into_buf is used if this is true
···
 	int ret;
 
 	mutex_lock(&test_fw_mutex);
-	if (strtobool(buf, cfg) < 0)
+	if (kstrtobool(buf, cfg) < 0)
 		ret = -EINVAL;
 	else
 		ret = size;

samples/kobject/kset-example.c

···
  * release function, and the set of default attributes we want created
  * whenever a kobject of this type is registered with the kernel.
  */
-static struct kobj_type foo_ktype = {
+static const struct kobj_type foo_ktype = {
 	.sysfs_ops = &foo_sysfs_ops,
 	.release = foo_release,
 	.default_groups = foo_default_groups,

scripts/const_structs.checkpatch

···
 kernel_param_ops
 kgdb_arch
 kgdb_io
+kobj_type
 kset_uevent_ops
 lock_manager_operations
 machine_desc

sound/aoa/soundbus/core.c

···
 }
 
 
-static int soundbus_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int soundbus_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
-	struct soundbus_dev * soundbus_dev;
-	struct platform_device * of;
+	const struct soundbus_dev * soundbus_dev;
+	const struct platform_device * of;
 	const char *compat;
 	int retval = 0;
 	int cplen, seen = 0;

sound/hda/hda_bus_type.c

···
 	return 1;
 }
 
-static int hda_uevent(struct device *dev, struct kobj_uevent_env *env)
+static int hda_uevent(const struct device *dev, struct kobj_uevent_env *env)
 {
 	char modalias[32];
 

sound/hda/hdac_device.c

···
  *
  * Returns the size of string, like snprintf(), or a negative error code.
  */
-int snd_hdac_codec_modalias(struct hdac_device *codec, char *buf, size_t size)
+int snd_hdac_codec_modalias(const struct hdac_device *codec, char *buf, size_t size)
 {
 	return scnprintf(buf, size, "hdaudio:v%08Xr%08Xa%02X\n",
 			codec->vendor_id, codec->revision_id, codec->type);