Merge branch 'pci/resource'

- Add pci_dev_for_each_resource() and pci_bus_for_each_resource() iterators
to simplify loops (Andy Shevchenko)

* pci/resource:
EISA: Drop unused pci_bus_for_each_resource() index argument
PCI: Make pci_bus_for_each_resource() index optional
PCI: Document pci_bus_for_each_resource()
PCI: Introduce pci_dev_for_each_resource()
PCI: Introduce pci_resource_n()

.clang-format

···
   - 'of_property_for_each_string'
   - 'of_property_for_each_u32'
   - 'pci_bus_for_each_resource'
+  - 'pci_dev_for_each_resource'
   - 'pci_doe_for_each_off'
   - 'pcl_for_each_chunk'
   - 'pcl_for_each_segment'

arch/alpha/kernel/pci.c

···
 	struct pci_bus *child_bus;
 
 	list_for_each_entry(dev, &b->devices, bus_list) {
+		struct resource *r;
 		int i;
 
-		for (i = 0; i < PCI_NUM_RESOURCES; i++) {
-			struct resource *r = &dev->resource[i];
-
+		pci_dev_for_each_resource(dev, r, i) {
 			if (r->parent || !r->start || !r->flags)
 				continue;
 			if (pci_has_flag(PCI_PROBE_ONLY) ||

arch/arm/kernel/bios32.c

···
  */
 static void pci_fixup_dec21285(struct pci_dev *dev)
 {
-	int i;
-
 	if (dev->devfn == 0) {
+		struct resource *r;
+
 		dev->class &= 0xff;
 		dev->class |= PCI_CLASS_BRIDGE_HOST << 8;
-		for (i = 0; i < PCI_NUM_RESOURCES; i++) {
-			dev->resource[i].start = 0;
-			dev->resource[i].end   = 0;
-			dev->resource[i].flags = 0;
+		pci_dev_for_each_resource(dev, r) {
+			r->start = 0;
+			r->end = 0;
+			r->flags = 0;
 		}
 	}
 }
···
 static void pci_fixup_ide_bases(struct pci_dev *dev)
 {
 	struct resource *r;
-	int i;
 
 	if ((dev->class >> 8) != PCI_CLASS_STORAGE_IDE)
 		return;
 
-	for (i = 0; i < PCI_NUM_RESOURCES; i++) {
-		r = dev->resource + i;
+	pci_dev_for_each_resource(dev, r) {
 		if ((r->start & ~0x80) == 0x374) {
 			r->start |= 2;
 			r->end = r->start;

arch/arm/mach-dove/pcie.c

···
 static void rc_pci_fixup(struct pci_dev *dev)
 {
 	if (dev->bus->parent == NULL && dev->devfn == 0) {
-		int i;
+		struct resource *r;
 
 		dev->class &= 0xff;
 		dev->class |= PCI_CLASS_BRIDGE_HOST << 8;
-		for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
-			dev->resource[i].start = 0;
-			dev->resource[i].end   = 0;
-			dev->resource[i].flags = 0;
+		pci_dev_for_each_resource(dev, r) {
+			r->start = 0;
+			r->end   = 0;
+			r->flags = 0;
 		}
 	}
 }

arch/arm/mach-mv78xx0/pcie.c

···
 static void rc_pci_fixup(struct pci_dev *dev)
 {
 	if (dev->bus->parent == NULL && dev->devfn == 0) {
-		int i;
+		struct resource *r;
 
 		dev->class &= 0xff;
 		dev->class |= PCI_CLASS_BRIDGE_HOST << 8;
-		for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
-			dev->resource[i].start = 0;
-			dev->resource[i].end   = 0;
-			dev->resource[i].flags = 0;
+		pci_dev_for_each_resource(dev, r) {
+			r->start = 0;
+			r->end   = 0;
+			r->flags = 0;
 		}
 	}
 }

arch/arm/mach-orion5x/pci.c

···
 static void rc_pci_fixup(struct pci_dev *dev)
 {
 	if (dev->bus->parent == NULL && dev->devfn == 0) {
-		int i;
+		struct resource *r;
 
 		dev->class &= 0xff;
 		dev->class |= PCI_CLASS_BRIDGE_HOST << 8;
-		for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
-			dev->resource[i].start = 0;
-			dev->resource[i].end   = 0;
-			dev->resource[i].flags = 0;
+		pci_dev_for_each_resource(dev, r) {
+			r->start	= 0;
+			r->end		= 0;
+			r->flags	= 0;
 		}
 	}
 }

arch/mips/pci/ops-bcm63xx.c

···
 static void bcm63xx_fixup(struct pci_dev *dev)
 {
 	static int io_window = -1;
-	int i, found, new_io_window;
+	int found, new_io_window;
+	struct resource *r;
 	u32 val;
 
 	/* look for any io resource */
 	found = 0;
-	for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
-		if (pci_resource_flags(dev, i) & IORESOURCE_IO) {
+	pci_dev_for_each_resource(dev, r) {
+		if (resource_type(r) == IORESOURCE_IO) {
 			found = 1;
 			break;
 		}
 	}
-
 	if (!found)
 		return;
 

arch/mips/pci/pci-legacy.c

···
 
 	pci_read_config_word(dev, PCI_COMMAND, &cmd);
 	old_cmd = cmd;
-	for (idx = 0; idx < PCI_NUM_RESOURCES; idx++) {
+	pci_dev_for_each_resource(dev, r, idx) {
 		/* Only set up the requested stuff */
 		if (!(mask & (1<<idx)))
 			continue;
 
-		r = &dev->resource[idx];
 		if (!(r->flags & (IORESOURCE_IO | IORESOURCE_MEM)))
 			continue;
 		if ((idx == PCI_ROM_RESOURCE) &&

arch/powerpc/kernel/pci-common.c

···
 static void pcibios_fixup_resources(struct pci_dev *dev)
 {
 	struct pci_controller *hose = pci_bus_to_host(dev->bus);
+	struct resource *res;
 	int i;
 
 	if (!hose) {
···
 	if (dev->is_virtfn)
 		return;
 
-	for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
-		struct resource *res = dev->resource + i;
+	pci_dev_for_each_resource(dev, res, i) {
 		struct pci_bus_region reg;
+
 		if (!res->flags)
 			continue;
 
···
 	struct pci_bus *child_bus;
 
 	list_for_each_entry(dev, &bus->devices, bus_list) {
+		struct resource *r;
 		int i;
 
-		for (i = 0; i < PCI_NUM_RESOURCES; i++) {
-			struct resource *r = &dev->resource[i];
-
+		pci_dev_for_each_resource(dev, r, i) {
 			if (r->parent || !r->start || !r->flags)
 				continue;
 
···
 
 static void fixup_hide_host_resource_fsl(struct pci_dev *dev)
 {
-	int i, class = dev->class >> 8;
+	int class = dev->class >> 8;
 	/* When configured as agent, programming interface = 1 */
 	int prog_if = dev->class & 0xf;
+	struct resource *r;
 
 	if ((class == PCI_CLASS_PROCESSOR_POWERPC ||
 	     class == PCI_CLASS_BRIDGE_OTHER) &&
 		(dev->hdr_type == PCI_HEADER_TYPE_NORMAL) &&
 		(prog_if == 0) &&
 		(dev->bus->parent == NULL)) {
-		for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
-			dev->resource[i].start = 0;
-			dev->resource[i].end = 0;
-			dev->resource[i].flags = 0;
+		pci_dev_for_each_resource(dev, r) {
+			r->start = 0;
+			r->end = 0;
+			r->flags = 0;
 		}
 	}
 }

arch/powerpc/platforms/4xx/pci.c

···
 static void fixup_ppc4xx_pci_bridge(struct pci_dev *dev)
 {
 	struct pci_controller *hose;
-	int i;
+	struct resource *r;
 
 	if (dev->devfn != 0 || dev->bus->self != NULL)
 		return;
···
 	/* Hide the PCI host BARs from the kernel as their content doesn't
 	 * fit well in the resource management
 	 */
-	for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
-		dev->resource[i].start = dev->resource[i].end = 0;
-		dev->resource[i].flags = 0;
+	pci_dev_for_each_resource(dev, r) {
+		r->start = r->end = 0;
+		r->flags = 0;
 	}
 
 	printk(KERN_INFO "PCI: Hiding 4xx host bridge resources %s\n",

arch/powerpc/platforms/52xx/mpc52xx_pci.c

···
 static void
 mpc52xx_pci_fixup_resources(struct pci_dev *dev)
 {
-	int i;
+	struct resource *res;
 
 	pr_debug("%s() %.4x:%.4x\n", __func__, dev->vendor, dev->device);
 
 	/* We don't rely on boot loader for PCI and resets all
 	   devices */
-	for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
-		struct resource *res = &dev->resource[i];
+	pci_dev_for_each_resource(dev, res) {
 		if (res->end > res->start) {	/* Only valid resources */
 			res->end -= res->start;
 			res->start = 0;

arch/powerpc/platforms/pseries/pci.c

···
  */
 static void fixup_winbond_82c105(struct pci_dev* dev)
 {
-	int i;
+	struct resource *r;
 	unsigned int reg;
 
 	if (!machine_is(pseries))
···
 	/* Enable LEGIRQ to use INTC instead of ISA interrupts */
 	pci_write_config_dword(dev, 0x40, reg | (1<<11));
 
-	for (i = 0; i < DEVICE_COUNT_RESOURCE; ++i) {
+	pci_dev_for_each_resource(dev, r) {
 		/* zap the 2nd function of the winbond chip */
-		if (dev->resource[i].flags & IORESOURCE_IO
-		    && dev->bus->number == 0 && dev->devfn == 0x81)
-			dev->resource[i].flags &= ~IORESOURCE_IO;
-		if (dev->resource[i].start == 0 && dev->resource[i].end) {
-			dev->resource[i].flags = 0;
-			dev->resource[i].end = 0;
+		if (dev->bus->number == 0 && dev->devfn == 0x81 &&
+		    r->flags & IORESOURCE_IO)
+			r->flags &= ~IORESOURCE_IO;
+		if (r->start == 0 && r->end) {
+			r->flags = 0;
+			r->end = 0;
 		}
 	}
 }

arch/sh/drivers/pci/pcie-sh7786.c

···
 	 * Prevent enumeration of root complex resources.
 	 */
 	if (pci_is_root_bus(dev->bus) && dev->devfn == 0) {
-		int i;
+		struct resource *r;
 
-		for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
-			dev->resource[i].start	= 0;
-			dev->resource[i].end	= 0;
-			dev->resource[i].flags	= 0;
+		pci_dev_for_each_resource(dev, r) {
+			r->start	= 0;
+			r->end		= 0;
+			r->flags	= 0;
 		}
 	}
 }

arch/sparc/kernel/leon_pci.c

···
 
 int pcibios_enable_device(struct pci_dev *dev, int mask)
 {
+	struct resource *res;
 	u16 cmd, oldcmd;
 	int i;
 
 	pci_read_config_word(dev, PCI_COMMAND, &cmd);
 	oldcmd = cmd;
 
-	for (i = 0; i < PCI_NUM_RESOURCES; i++) {
-		struct resource *res = &dev->resource[i];
-
+	pci_dev_for_each_resource(dev, res, i) {
 		/* Only set up the requested stuff */
 		if (!(mask & (1<<i)))
 			continue;

arch/sparc/kernel/pci.c

···
 	struct pci_dev *dev;
 
 	list_for_each_entry(dev, &bus->devices, bus_list) {
+		struct resource *r;
 		int i;
 
-		for (i = 0; i < PCI_NUM_RESOURCES; i++) {
-			struct resource *r = &dev->resource[i];
-
+		pci_dev_for_each_resource(dev, r, i) {
 			if (r->parent || !r->start || !r->flags)
 				continue;
 
···
 
 int pcibios_enable_device(struct pci_dev *dev, int mask)
 {
+	struct resource *res;
 	u16 cmd, oldcmd;
 	int i;
 
 	pci_read_config_word(dev, PCI_COMMAND, &cmd);
 	oldcmd = cmd;
 
-	for (i = 0; i < PCI_NUM_RESOURCES; i++) {
-		struct resource *res = &dev->resource[i];
-
+	pci_dev_for_each_resource(dev, res, i) {
 		/* Only set up the requested stuff */
 		if (!(mask & (1<<i)))
 			continue;

arch/sparc/kernel/pcic.c

···
 
 int pcibios_enable_device(struct pci_dev *dev, int mask)
 {
+	struct resource *res;
 	u16 cmd, oldcmd;
 	int i;
 
 	pci_read_config_word(dev, PCI_COMMAND, &cmd);
 	oldcmd = cmd;
 
-	for (i = 0; i < PCI_NUM_RESOURCES; i++) {
-		struct resource *res = &dev->resource[i];
-
+	pci_dev_for_each_resource(dev, res, i) {
 		/* Only set up the requested stuff */
 		if (!(mask & (1<<i)))
 			continue;

drivers/eisa/pci_eisa.c

···
 
 static int __init pci_eisa_init(struct pci_dev *pdev)
 {
-	int rc, i;
 	struct resource *res, *bus_res = NULL;
+	int rc;
 
 	if ((rc = pci_enable_device (pdev))) {
 		dev_err(&pdev->dev, "Could not enable device\n");
···
 	 * eisa_root_register() can only deal with a single io port resource,
 	*  so we use the first valid io port resource.
 	 */
-	pci_bus_for_each_resource(pdev->bus, res, i)
+	pci_bus_for_each_resource(pdev->bus, res)
 		if (res && (res->flags & IORESOURCE_IO)) {
 			bus_res = res;
 			break;

drivers/pci/bus.c

···
 		void *alignf_data,
 		struct pci_bus_region *region)
 {
-	int i, ret;
 	struct resource *r, avail;
 	resource_size_t max;
+	int ret;
 
 	type_mask |= IORESOURCE_TYPE_BITS;
 
-	pci_bus_for_each_resource(bus, r, i) {
+	pci_bus_for_each_resource(bus, r) {
 		resource_size_t min_used = min;
 
 		if (!r)
···
 	struct resource *res = &dev->resource[idx];
 	struct resource orig_res = *res;
 	struct resource *r;
-	int i;
 
-	pci_bus_for_each_resource(bus, r, i) {
+	pci_bus_for_each_resource(bus, r) {
 		resource_size_t start, end;
 
 		if (!r)

drivers/pci/hotplug/shpchp_sysfs.c

···
 static ssize_t show_ctrl(struct device *dev, struct device_attribute *attr, char *buf)
 {
 	struct pci_dev *pdev;
-	int index, busnr;
 	struct resource *res;
 	struct pci_bus *bus;
 	size_t len = 0;
+	int busnr;
 
 	pdev = to_pci_dev(dev);
 	bus = pdev->subordinate;
 
 	len += sysfs_emit_at(buf, len, "Free resources: memory\n");
-	pci_bus_for_each_resource(bus, res, index) {
+	pci_bus_for_each_resource(bus, res) {
 		if (res && (res->flags & IORESOURCE_MEM) &&
 				!(res->flags & IORESOURCE_PREFETCH)) {
 			len += sysfs_emit_at(buf, len,
···
 		}
 	}
 	len += sysfs_emit_at(buf, len, "Free resources: prefetchable memory\n");
-	pci_bus_for_each_resource(bus, res, index) {
+	pci_bus_for_each_resource(bus, res) {
 		if (res && (res->flags & IORESOURCE_MEM) &&
 			       (res->flags & IORESOURCE_PREFETCH)) {
 			len += sysfs_emit_at(buf, len,
···
 		}
 	}
 	len += sysfs_emit_at(buf, len, "Free resources: IO\n");
-	pci_bus_for_each_resource(bus, res, index) {
+	pci_bus_for_each_resource(bus, res) {
 		if (res && (res->flags & IORESOURCE_IO)) {
 			len += sysfs_emit_at(buf, len,
 					     "start = %8.8llx, length = %8.8llx\n",

drivers/pci/pci.c

···
 {
 	const struct pci_bus *bus = dev->bus;
 	struct resource *r;
-	int i;
 
-	pci_bus_for_each_resource(bus, r, i) {
+	pci_bus_for_each_resource(bus, r) {
 		if (!r)
 			continue;
 		if (resource_contains(r, res)) {

drivers/pci/probe.c

···
 	pci_read_bridge_mmio_pref(child);
 
 	if (dev->transparent) {
-		pci_bus_for_each_resource(child->parent, res, i) {
+		pci_bus_for_each_resource(child->parent, res) {
 			if (res && res->flags) {
 				pci_bus_add_resource(child, res,
 						     PCI_SUBTRACTIVE_DECODE);

drivers/pci/remove.c

···
 
 static void pci_free_resources(struct pci_dev *dev)
 {
-	int i;
+	struct resource *res;
 
-	for (i = 0; i < PCI_NUM_RESOURCES; i++) {
-		struct resource *res = dev->resource + i;
+	pci_dev_for_each_resource(dev, res) {
 		if (res->parent)
 			release_resource(res);
 	}

drivers/pci/setup-bus.c

···
 	return dev_res ? dev_res->min_align : 0;
 }
 
-
 /* Sort resources by alignment */
 static void pdev_sort_resources(struct pci_dev *dev, struct list_head *head)
 {
+	struct resource *r;
 	int i;
 
-	for (i = 0; i < PCI_NUM_RESOURCES; i++) {
-		struct resource *r;
+	pci_dev_for_each_resource(dev, r, i) {
 		struct pci_dev_resource *dev_res, *tmp;
 		resource_size_t r_align;
 		struct list_head *n;
-
-		r = &dev->resource[i];
 
 		if (r->flags & IORESOURCE_PCI_FIXED)
 			continue;
···
 						  unsigned long type)
 {
 	struct resource *r, *r_assigned = NULL;
-	int i;
 
-	pci_bus_for_each_resource(bus, r, i) {
+	pci_bus_for_each_resource(bus, r) {
 		if (r == &ioport_resource || r == &iomem_resource)
 			continue;
 		if (r && (r->flags & type_mask) == type && !r->parent)
···
 
 	min_align = window_alignment(bus, IORESOURCE_IO);
 	list_for_each_entry(dev, &bus->devices, bus_list) {
-		int i;
+		struct resource *r;
 
-		for (i = 0; i < PCI_NUM_RESOURCES; i++) {
-			struct resource *r = &dev->resource[i];
+		pci_dev_for_each_resource(dev, r) {
 			unsigned long r_size;
 
 			if (r->parent || !(r->flags & IORESOURCE_IO))
···
 	size = 0;
 
 	list_for_each_entry(dev, &bus->devices, bus_list) {
+		struct resource *r;
 		int i;
 
-		for (i = 0; i < PCI_NUM_RESOURCES; i++) {
-			struct resource *r = &dev->resource[i];
+		pci_dev_for_each_resource(dev, r, i) {
 			resource_size_t r_size;
 
 			if (r->parent || (r->flags & IORESOURCE_PCI_FIXED) ||
···
 			additional_mmio_pref_size = 0;
 	struct resource *pref;
 	struct pci_host_bridge *host;
-	int hdr_type, i, ret;
+	int hdr_type, ret;
 
 	list_for_each_entry(dev, &bus->devices, bus_list) {
 		struct pci_bus *b = dev->subordinate;
···
 		host = to_pci_host_bridge(bus->bridge);
 		if (!host->size_windows)
 			return;
-		pci_bus_for_each_resource(bus, pref, i)
+		pci_bus_for_each_resource(bus, pref)
 			if (pref && (pref->flags & IORESOURCE_PREFETCH))
 				break;
 		hdr_type = -1;	/* Intentionally invalid - not a PCI device. */
···
 
 static void assign_fixed_resource_on_bus(struct pci_bus *b, struct resource *r)
 {
-	int i;
 	struct resource *parent_r;
 	unsigned long mask = IORESOURCE_IO | IORESOURCE_MEM |
 			     IORESOURCE_PREFETCH;
 
-	pci_bus_for_each_resource(b, parent_r, i) {
+	pci_bus_for_each_resource(b, parent_r) {
 		if (!parent_r)
 			continue;
 
···
  */
 static void pdev_assign_fixed_resources(struct pci_dev *dev)
 {
-	int i;
+	struct resource *r;
 
-	for (i = 0; i <  PCI_NUM_RESOURCES; i++) {
+	pci_dev_for_each_resource(dev, r) {
 		struct pci_bus *b;
-		struct resource *r = &dev->resource[i];
 
 		if (r->parent || !(r->flags & IORESOURCE_PCI_FIXED) ||
 		    !(r->flags & (IORESOURCE_IO | IORESOURCE_MEM)))
···
 				 struct resource *mmio,
 				 struct resource *mmio_pref)
 {
-	int i;
+	struct resource *res;
 
-	for (i = 0; i < PCI_NUM_RESOURCES; i++) {
-		struct resource *res = &dev->resource[i];
-
+	pci_dev_for_each_resource(dev, res) {
 		if (resource_type(res) == IORESOURCE_IO) {
 			remove_dev_resource(io, dev, res);
 		} else if (resource_type(res) == IORESOURCE_MEM) {

drivers/pci/setup-res.c

···
 	pci_read_config_word(dev, PCI_COMMAND, &cmd);
 	old_cmd = cmd;
 
-	for (i = 0; i < PCI_NUM_RESOURCES; i++) {
+	pci_dev_for_each_resource(dev, r, i) {
 		if (!(mask & (1 << i)))
 			continue;
-
-		r = &dev->resource[i];
 
 		if (!(r->flags & (IORESOURCE_IO | IORESOURCE_MEM)))
 			continue;

drivers/pci/vgaarb.c

···
 #if defined(CONFIG_X86) || defined(CONFIG_IA64)
 	u64 base = screen_info.lfb_base;
 	u64 size = screen_info.lfb_size;
+	struct resource *r;
 	u64 limit;
-	resource_size_t start, end;
-	unsigned long flags;
-	int i;
 
 	/* Select the device owning the boot framebuffer if there is one */
 
···
 	limit = base + size;
 
 	/* Does firmware framebuffer belong to us? */
-	for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
-		flags = pci_resource_flags(pdev, i);
-
-		if ((flags & IORESOURCE_MEM) == 0)
+	pci_dev_for_each_resource(pdev, r) {
+		if (resource_type(r) != IORESOURCE_MEM)
 			continue;
 
-		start = pci_resource_start(pdev, i);
-		end  = pci_resource_end(pdev, i);
-
-		if (!start || !end)
+		if (!r->start || !r->end)
 			continue;
 
-		if (base < start || limit >= end)
+		if (base < r->start || limit >= r->end)
 			continue;
 
 		return true;

drivers/pci/xen-pcifront.c

···
 	int i;
 	struct resource *r;
 
-	for (i = 0; i < PCI_NUM_RESOURCES; i++) {
-		r = &dev->resource[i];
-
+	pci_dev_for_each_resource(dev, r, i) {
 		if (!r->parent && r->start && r->flags) {
 			dev_info(&pdev->xdev->dev, "claiming resource %s/%d\n",
 				pci_name(dev), i);

drivers/pnp/quirks.c

···
 static void quirk_system_pci_resources(struct pnp_dev *dev)
 {
 	struct pci_dev *pdev = NULL;
-	struct resource *res;
-	resource_size_t pnp_start, pnp_end, pci_start, pci_end;
+	struct resource *res, *r;
 	int i, j;
 
 	/*
···
 	 * so they won't be claimed by the PNP system driver.
 	 */
 	for_each_pci_dev(pdev) {
-		for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
-			unsigned long flags, type;
+		pci_dev_for_each_resource(pdev, r, i) {
+			unsigned long type = resource_type(r);
 
-			flags = pci_resource_flags(pdev, i);
-			type = flags & (IORESOURCE_IO | IORESOURCE_MEM);
-			if (!type || pci_resource_len(pdev, i) == 0)
+			if (!(type == IORESOURCE_IO || type == IORESOURCE_MEM) ||
+			    resource_size(r) == 0)
 				continue;
 
-			if (flags & IORESOURCE_UNSET)
+			if (r->flags & IORESOURCE_UNSET)
 				continue;
 
-			pci_start = pci_resource_start(pdev, i);
-			pci_end = pci_resource_end(pdev, i);
 			for (j = 0;
 			     (res = pnp_get_resource(dev, type, j)); j++) {
 				if (res->start == 0 && res->end == 0)
 					continue;
 
-				pnp_start = res->start;
-				pnp_end = res->end;
-
 				/*
 				 * If the PNP region doesn't overlap the PCI
 				 * region at all, there's no problem.
 				 */
-				if (pnp_end < pci_start || pnp_start > pci_end)
+				if (!resource_overlaps(res, r))
 					continue;
 
 				/*
···
 				 * PNP device describes a bridge with PCI
 				 * behind it.
 				 */
-				if (pnp_start <= pci_start &&
-				    pnp_end >= pci_end)
+				if (res->start <= r->start && res->end >= r->end)
 					continue;
 
 				/*
···
 				 * driver from requesting its resources.
 				 */
 				dev_warn(&dev->dev,
-					 "disabling %pR because it overlaps "
-					 "%s BAR %d %pR\n", res,
-					 pci_name(pdev), i, &pdev->resource[i]);
+					 "disabling %pR because it overlaps %s BAR %d %pR\n",
+					 res, pci_name(pdev), i, r);
 				res->flags |= IORESOURCE_DISABLED;
 			}
 		}

include/linux/pci.h

···
 /* Temporary until new and working PCI SBR API in place */
 int pci_bridge_secondary_bus_reset(struct pci_dev *dev);
 
-#define pci_bus_for_each_resource(bus, res, i)				\
-	for (i = 0;							\
-	    (res = pci_bus_resource_n(bus, i)) || i < PCI_BRIDGE_RESOURCE_NUM; \
-	     i++)
+#define __pci_bus_for_each_res0(bus, res, ...)				\
+	for (unsigned int __b = 0;					\
+	     (res = pci_bus_resource_n(bus, __b)) || __b < PCI_BRIDGE_RESOURCE_NUM; \
+	     __b++)
+
+#define __pci_bus_for_each_res1(bus, res, __b)				\
+	for (__b = 0;							\
+	     (res = pci_bus_resource_n(bus, __b)) || __b < PCI_BRIDGE_RESOURCE_NUM; \
+	     __b++)
+
+/**
+ * pci_bus_for_each_resource - iterate over PCI bus resources
+ * @bus: the PCI bus
+ * @res: pointer to the current resource
+ * @...: optional index of the current resource
+ *
+ * Iterate over PCI bus resources. The first part is to go over PCI bus
+ * resource array, which has at most the %PCI_BRIDGE_RESOURCE_NUM entries.
+ * After that continue with the separate list of the additional resources,
+ * if not empty. That's why the Logical OR is being used.
+ *
+ * Possible usage:
+ *
+ *	struct pci_bus *bus = ...;
+ *	struct resource *res;
+ *	unsigned int i;
+ *
+ * 	// With optional index
+ * 	pci_bus_for_each_resource(bus, res, i)
+ * 		pr_info("PCI bus resource[%u]: %pR\n", i, res);
+ *
+ * 	// Without index
+ * 	pci_bus_for_each_resource(bus, res)
+ * 		_do_something_(res);
+ */
+#define pci_bus_for_each_resource(bus, res, ...)			\
+	CONCATENATE(__pci_bus_for_each_res, COUNT_ARGS(__VA_ARGS__))	\
+		    (bus, res, __VA_ARGS__)
 
 int __must_check pci_bus_alloc_resource(struct pci_bus *bus,
 			struct resource *res, resource_size_t size,
···
  * These helpers provide future and backwards compatibility
  * for accessing popular PCI BAR info
  */
-#define pci_resource_start(dev, bar)	((dev)->resource[(bar)].start)
-#define pci_resource_end(dev, bar)	((dev)->resource[(bar)].end)
-#define pci_resource_flags(dev, bar)	((dev)->resource[(bar)].flags)
-#define pci_resource_len(dev,bar) \
-	((pci_resource_end((dev), (bar)) == 0) ? 0 :	\
-							\
-	 (pci_resource_end((dev), (bar)) -		\
-	  pci_resource_start((dev), (bar)) + 1))
+#define pci_resource_n(dev, bar)	(&(dev)->resource[(bar)])
+#define pci_resource_start(dev, bar)	(pci_resource_n(dev, bar)->start)
+#define pci_resource_end(dev, bar)	(pci_resource_n(dev, bar)->end)
+#define pci_resource_flags(dev, bar)	(pci_resource_n(dev, bar)->flags)
+#define pci_resource_len(dev,bar)					\
+	(pci_resource_end((dev), (bar)) ? 				\
+	 resource_size(pci_resource_n((dev), (bar))) : 0)
+
+#define __pci_dev_for_each_res0(dev, res, ...)				\
+	for (unsigned int __b = 0;					\
+	     res = pci_resource_n(dev, __b), __b < PCI_NUM_RESOURCES;	\
+	     __b++)
+
+#define __pci_dev_for_each_res1(dev, res, __b)				\
+	for (__b = 0;							\
+	     res = pci_resource_n(dev, __b), __b < PCI_NUM_RESOURCES;	\
+	     __b++)
+
+#define pci_dev_for_each_resource(dev, res, ...)			\
+	CONCATENATE(__pci_dev_for_each_res, COUNT_ARGS(__VA_ARGS__)) 	\
+		    (dev, res, __VA_ARGS__)
 
 /*
  * Similar to the helpers above, these manipulate per-pci_dev