Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-2.6

* git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-2.6:
debugfs: fix sparse warnings
Driver core: Fix cleanup when failing device_add().
driver core: Remove dpm_sysfs_remove() from error path of device_add()
PM: fix new mutex-locking bug in the PM core
PM: Do not acquire device semaphores upfront during suspend
kobject: properly initialize ksets
sysfs: CONFIG_SYSFS_DEPRECATED fix
driver core: fix up Kconfig text for CONFIG_SYSFS_DEPRECATED

drivers/base/core.c

···
 static void cleanup_glue_dir(struct device *dev, struct kobject *glue_dir)
 {
 	/* see if we live in a "glue" directory */
-	if (!dev->class || glue_dir->kset != &dev->class->class_dirs)
+	if (!glue_dir || !dev->class ||
+	    glue_dir->kset != &dev->class->class_dirs)
 		return;
 
 	kobject_put(glue_dir);
···
 	struct class_interface *class_intf;
 	int error;
 
-	error = pm_sleep_lock();
-	if (error) {
-		dev_warn(dev, "Suspicious %s during suspend\n", __FUNCTION__);
-		dump_stack();
-		return error;
-	}
-
 	dev = get_device(dev);
 	if (!dev || !strlen(dev->bus_id)) {
 		error = -EINVAL;
-		goto Error;
+		goto Done;
 	}
 
 	pr_debug("device: '%s': %s\n", dev->bus_id, __FUNCTION__);
···
 	}
  Done:
 	put_device(dev);
-	pm_sleep_unlock();
 	return error;
  BusError:
 	device_pm_remove(dev);
-	dpm_sysfs_remove(dev);
  PMError:
 	if (dev->bus)
 		blocking_notifier_call_chain(&dev->bus->p->bus_notifier,

drivers/base/power/main.c

···
  */
 
 LIST_HEAD(dpm_active);
-static LIST_HEAD(dpm_locked);
 static LIST_HEAD(dpm_off);
 static LIST_HEAD(dpm_off_irq);
 static LIST_HEAD(dpm_destroy);
···
  */
 void device_pm_remove(struct device *dev)
 {
-	/*
-	 * If this function is called during a suspend, it will be blocked,
-	 * because we're holding the device's semaphore at that time, which may
-	 * lead to a deadlock.  In that case we want to print a warning.
-	 * However, it may also be called by unregister_dropped_devices() with
-	 * the device's semaphore released, in which case the warning should
-	 * not be printed.
-	 */
-	if (down_trylock(&dev->sem)) {
-		if (down_read_trylock(&pm_sleep_rwsem)) {
-			/* No suspend in progress, wait on dev->sem */
-			down(&dev->sem);
-			up_read(&pm_sleep_rwsem);
-		} else {
-			/* Suspend in progress, we may deadlock */
-			dev_warn(dev, "Suspicious %s during suspend\n",
-				__FUNCTION__);
-			dump_stack();
-			/* The user has been warned ... */
-			down(&dev->sem);
-		}
-	}
 	pr_debug("PM: Removing info for %s:%s\n",
 		 dev->bus ? dev->bus->name : "No Bus",
 		 kobject_name(&dev->kobj));
···
 	dpm_sysfs_remove(dev);
 	list_del_init(&dev->power.entry);
 	mutex_unlock(&dpm_list_mtx);
-	up(&dev->sem);
 }
 
 /**
···
 	TRACE_DEVICE(dev);
 	TRACE_RESUME(0);
 
+	down(&dev->sem);
+
 	if (dev->bus && dev->bus->resume) {
 		dev_dbg(dev,"resuming\n");
 		error = dev->bus->resume(dev);
···
 		dev_dbg(dev,"class resume\n");
 		error = dev->class->resume(dev);
 	}
+
+	up(&dev->sem);
 
 	TRACE_RESUME(error);
 	return error;
···
 		struct list_head *entry = dpm_off.next;
 		struct device *dev = to_device(entry);
 
-		list_move_tail(entry, &dpm_locked);
+		list_move_tail(entry, &dpm_active);
 		mutex_unlock(&dpm_list_mtx);
 		resume_device(dev);
 		mutex_lock(&dpm_list_mtx);
-	}
-	mutex_unlock(&dpm_list_mtx);
-}
-
-/**
- *	unlock_all_devices - Release each device's semaphore
- *
- *	Go through the dpm_off list.  Put each device on the dpm_active
- *	list and unlock it.
- */
-static void unlock_all_devices(void)
-{
-	mutex_lock(&dpm_list_mtx);
-	while (!list_empty(&dpm_locked)) {
-		struct list_head *entry = dpm_locked.prev;
-		struct device *dev = to_device(entry);
-
-		list_move(entry, &dpm_active);
-		up(&dev->sem);
 	}
 	mutex_unlock(&dpm_list_mtx);
 }
···
 		struct list_head *entry = dpm_destroy.next;
 		struct device *dev = to_device(entry);
 
-		up(&dev->sem);
 		mutex_unlock(&dpm_list_mtx);
 		/* This also removes the device from the list */
 		device_unregister(dev);
···
 {
 	might_sleep();
 	dpm_resume();
-	unlock_all_devices();
 	unregister_dropped_devices();
 	up_write(&pm_sleep_rwsem);
 }
···
 		struct list_head *entry = dpm_off.prev;
 		struct device *dev = to_device(entry);
 
-		list_del_init(&dev->power.entry);
 		error = suspend_device_late(dev, state);
 		if (error) {
 			printk(KERN_ERR "Could not power down device %s: "
 					"error %d\n",
 					kobject_name(&dev->kobj), error);
-			if (list_empty(&dev->power.entry))
-				list_add(&dev->power.entry, &dpm_off);
 			break;
 		}
-		if (list_empty(&dev->power.entry))
-			list_add(&dev->power.entry, &dpm_off_irq);
+		if (!list_empty(&dev->power.entry))
+			list_move(&dev->power.entry, &dpm_off_irq);
 	}
 
 	if (!error)
···
 static int suspend_device(struct device *dev, pm_message_t state)
 {
 	int error = 0;
+
+	down(&dev->sem);
 
 	if (dev->power.power_state.event) {
 		dev_dbg(dev, "PM: suspend %d-->%d\n",
···
 		error = dev->bus->suspend(dev, state);
 		suspend_report_result(dev->bus->suspend, error);
 	}
+
+	up(&dev->sem);
+
 	return error;
 }
 
···
 	int error = 0;
 
 	mutex_lock(&dpm_list_mtx);
-	while (!list_empty(&dpm_locked)) {
-		struct list_head *entry = dpm_locked.prev;
+	while (!list_empty(&dpm_active)) {
+		struct list_head *entry = dpm_active.prev;
 		struct device *dev = to_device(entry);
 
-		list_del_init(&dev->power.entry);
 		mutex_unlock(&dpm_list_mtx);
 		error = suspend_device(dev, state);
+		mutex_lock(&dpm_list_mtx);
 		if (error) {
 			printk(KERN_ERR "Could not suspend device %s: "
 					"error %d%s\n",
···
 					(error == -EAGAIN ?
 					" (please convert to suspend_late)" :
 					""));
-			mutex_lock(&dpm_list_mtx);
-			if (list_empty(&dev->power.entry))
-				list_add(&dev->power.entry, &dpm_locked);
 			break;
 		}
-		mutex_lock(&dpm_list_mtx);
-		if (list_empty(&dev->power.entry))
-			list_add(&dev->power.entry, &dpm_off);
+		if (!list_empty(&dev->power.entry))
+			list_move(&dev->power.entry, &dpm_off);
 	}
 	mutex_unlock(&dpm_list_mtx);
 
 	return error;
-}
-
-/**
- *	lock_all_devices - Acquire every device's semaphore
- *
- *	Go through the dpm_active list. Carefully lock each device's
- *	semaphore and put it in on the dpm_locked list.
- */
-static void lock_all_devices(void)
-{
-	mutex_lock(&dpm_list_mtx);
-	while (!list_empty(&dpm_active)) {
-		struct list_head *entry = dpm_active.next;
-		struct device *dev = to_device(entry);
-
-		/* Required locking order is dev->sem first,
-		 * then dpm_list_mutex.  Hence this awkward code.
-		 */
-		get_device(dev);
-		mutex_unlock(&dpm_list_mtx);
-		down(&dev->sem);
-		mutex_lock(&dpm_list_mtx);
-
-		if (list_empty(entry))
-			up(&dev->sem);		/* Device was removed */
-		else
-			list_move_tail(entry, &dpm_locked);
-		put_device(dev);
-	}
-	mutex_unlock(&dpm_list_mtx);
 }
 
 /**
···
 
 	might_sleep();
 	down_write(&pm_sleep_rwsem);
-	lock_all_devices();
 	error = dpm_suspend(state);
 	if (error)
 		device_resume();

drivers/usb/core/usb.c

···
 	 * singlethreaded.  Its job doesn't justify running on more
 	 * than one CPU.
 	 */
-	ksuspend_usb_wq = create_singlethread_workqueue("ksuspend_usbd");
+	ksuspend_usb_wq = create_freezeable_workqueue("ksuspend_usbd");
 	if (!ksuspend_usb_wq)
 		return -ENOMEM;
 	return 0;

fs/debugfs/inode.c

···
 
 #define DEBUGFS_MAGIC	0x64626720
 
-/* declared over in file.c */
-extern struct file_operations debugfs_file_operations;
-extern struct inode_operations debugfs_link_operations;
-
 static struct vfsmount *debugfs_mount;
 static int debugfs_mount_count;
 

include/linux/debugfs.h

···
 };
 
 #if defined(CONFIG_DEBUG_FS)
+
+/* declared over in file.c */
+extern const struct file_operations debugfs_file_operations;
+extern const struct inode_operations debugfs_link_operations;
+
 struct dentry *debugfs_create_file(const char *name, mode_t mode,
 				   struct dentry *parent, void *data,
 				   const struct file_operations *fops);

init/Kconfig

···
 	  sure you need the memory resource controller.
 
 config SYSFS_DEPRECATED
+	bool
+
+config SYSFS_DEPRECATED_V2
 	bool "Create deprecated sysfs files"
 	depends on SYSFS
 	default y
+	select SYSFS_DEPRECATED
 	help
 	  This option creates deprecated symlinks such as the
 	  "device"-link, the <subsystem>:<name>-link, and the
···
 
 	  If enabled, this option will also move any device structures
 	  that belong to a class, back into the /sys/class hierarchy, in
-	  order to support older versions of udev.
+	  order to support older versions of udev and some userspace
+	  programs.
 
-	  If you are using a distro that was released in 2006 or later,
-	  it should be safe to say N here.
+	  If you are using a distro with the most recent userspace
+	  packages, it should be safe to say N here.
 
 config PROC_PID_CPUSET
 	bool "Include legacy /proc/<pid>/cpuset file"

lib/kobject.c

···
 		return;
 	kref_init(&kobj->kref);
 	INIT_LIST_HEAD(&kobj->entry);
+	kobj->state_in_sysfs = 0;
+	kobj->state_add_uevent_sent = 0;
+	kobj->state_remove_uevent_sent = 0;
+	kobj->state_initialized = 1;
 }
 
 
···
 		dump_stack();
 	}
 
-	kref_init(&kobj->kref);
-	INIT_LIST_HEAD(&kobj->entry);
+	kobject_init_internal(kobj);
 	kobj->ktype = ktype;
-	kobj->state_in_sysfs = 0;
-	kobj->state_add_uevent_sent = 0;
-	kobj->state_remove_uevent_sent = 0;
-	kobj->state_initialized = 1;
 	return;
 
 error: