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

This can be broken down into these major areas:
 - Documentation updates (language translations and fixes, as
   well as kobject and kset documenatation updates.)
 - major kset/kobject/ktype rework and fixes.  This cleans up the
   kset and kobject and ktype relationship and architecture,
   making sense of things now, and good documenation and samples
   are provided for others to use.  Also the attributes for
   kobjects are much easier to handle now.  This cleaned up a LOT
   of code all through the kernel, making kobjects easier to use
   if you want to.
 - struct bus_type has been reworked to now handle the lifetime
   rules properly, as the kobject is properly dynamic.
 - struct driver has also been reworked, and now the lifetime
   issues are resolved.
 - the block subsystem has been converted to use struct device
   now, and not "raw" kobjects.  This patch has been in the -mm
   tree for over a year now, and finally all the issues are
   worked out with it.  Older distros now properly work with new
   kernels, and no userspace updates are needed at all.
 - nozomi driver is added.  This has also been in -mm for a long
   time, and many people have asked for it to go in.  It is now
   in good enough shape to do so.
 - lots of class_device conversions to use struct device instead.
   The tree is almost all cleaned up now, only SCSI and IB is the
   remaining code to fix up...

* git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-2.6: (196 commits)
  Driver core: coding style fixes
  Kobject: fix coding style issues in kobject c files
  Kobject: fix coding style issues in kobject.h
  Driver core: fix coding style issues in device.h
  spi: use class iteration api
  scsi: use class iteration api
  rtc: use class iteration api
  power supply : use class iteration api
  ieee1394: use class iteration api
  Driver Core: add class iteration api
  Driver core: Cleanup get_device_parent() in device_add() and device_move()
  UIO: constify function pointer tables
  Driver Core: constify the name passed to platform_device_register_simple
  driver core: fix build with SYSFS=n
  sysfs: make SYSFS_DEPRECATED depend on SYSFS
  Driver core: use LIST_HEAD instead of call to INIT_LIST_HEAD in __init
  kobject: add sample code for how to use ksets/ktypes/kobjects
  kobject: add sample code for how to use kobjects in a simple manner.
  kobject: update the kobject/kset documentation
  kobject: remove old, outdated documentation.
  ...

1 files changed, 309 insertions, 273 deletions

diff --git a/drivers/base/core.c b/drivers/base/core.c
index 2683eac30c68..edf3bbeb8d6a 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -18,14 +18,14 @@
 #include <linux/string.h>
 #include <linux/kdev_t.h>
 #include <linux/notifier.h>
-
+#include <linux/genhd.h>
 #include <asm/semaphore.h>
 
 #include "base.h"
 #include "power/power.h"
 
-int (*platform_notify)(struct device * dev) = NULL;
-int (*platform_notify_remove)(struct device * dev) = NULL;
+int (*platform_notify)(struct device *dev) = NULL;
+int (*platform_notify_remove)(struct device *dev) = NULL;
 
 /*
  * sysfs bindings for devices.
@@ -51,11 +51,11 @@ EXPORT_SYMBOL(dev_driver_string);
 #define to_dev(obj) container_of(obj, struct device, kobj)
 #define to_dev_attr(_attr) container_of(_attr, struct device_attribute, attr)
 
-static ssize_t
-dev_attr_show(struct kobject * kobj, struct attribute * attr, char * buf)
+static ssize_t dev_attr_show(struct kobject *kobj, struct attribute *attr,
+			     char *buf)
 {
-	struct device_attribute * dev_attr = to_dev_attr(attr);
-	struct device * dev = to_dev(kobj);
+	struct device_attribute *dev_attr = to_dev_attr(attr);
+	struct device *dev = to_dev(kobj);
 	ssize_t ret = -EIO;
 
 	if (dev_attr->show)
@@ -63,12 +63,11 @@ dev_attr_show(struct kobject * kobj, struct attribute * attr, char * buf)
 	return ret;
 }
 
-static ssize_t
-dev_attr_store(struct kobject * kobj, struct attribute * attr,
-	       const char * buf, size_t count)
+static ssize_t dev_attr_store(struct kobject *kobj, struct attribute *attr,
+			      const char *buf, size_t count)
 {
-	struct device_attribute * dev_attr = to_dev_attr(attr);
-	struct device * dev = to_dev(kobj);
+	struct device_attribute *dev_attr = to_dev_attr(attr);
+	struct device *dev = to_dev(kobj);
 	ssize_t ret = -EIO;
 
 	if (dev_attr->store)
@@ -90,9 +89,9 @@ static struct sysfs_ops dev_sysfs_ops = {
  *	reaches 0. We forward the call to the device's release
  *	method, which should handle actually freeing the structure.
  */
-static void device_release(struct kobject * kobj)
+static void device_release(struct kobject *kobj)
 {
-	struct device * dev = to_dev(kobj);
+	struct device *dev = to_dev(kobj);
 
 	if (dev->release)
 		dev->release(dev);
@@ -101,8 +100,8 @@ static void device_release(struct kobject * kobj)
 	else if (dev->class && dev->class->dev_release)
 		dev->class->dev_release(dev);
 	else {
-		printk(KERN_ERR "Device '%s' does not have a release() function, "
-			"it is broken and must be fixed.\n",
+		printk(KERN_ERR "Device '%s' does not have a release() "
+			"function, it is broken and must be fixed.\n",
 			dev->bus_id);
 		WARN_ON(1);
 	}
@@ -185,7 +184,8 @@ static int dev_uevent(struct kset *kset, struct kobject *kobj,
 		add_uevent_var(env, "PHYSDEVBUS=%s", dev->bus->name);
 
 		if (dev->driver)
-			add_uevent_var(env, "PHYSDEVDRIVER=%s", dev->driver->name);
+			add_uevent_var(env, "PHYSDEVDRIVER=%s",
+				       dev->driver->name);
 	}
 #endif
 
@@ -193,15 +193,16 @@ static int dev_uevent(struct kset *kset, struct kobject *kobj,
 	if (dev->bus && dev->bus->uevent) {
 		retval = dev->bus->uevent(dev, env);
 		if (retval)
-			pr_debug ("%s: bus uevent() returned %d\n",
-				  __FUNCTION__, retval);
+			pr_debug("device: '%s': %s: bus uevent() returned %d\n",
+				 dev->bus_id, __FUNCTION__, retval);
 	}
 
 	/* have the class specific function add its stuff */
 	if (dev->class && dev->class->dev_uevent) {
 		retval = dev->class->dev_uevent(dev, env);
 		if (retval)
-			pr_debug("%s: class uevent() returned %d\n",
+			pr_debug("device: '%s': %s: class uevent() "
+				 "returned %d\n", dev->bus_id,
 				 __FUNCTION__, retval);
 	}
 
@@ -209,7 +210,8 @@ static int dev_uevent(struct kset *kset, struct kobject *kobj,
 	if (dev->type && dev->type->uevent) {
 		retval = dev->type->uevent(dev, env);
 		if (retval)
-			pr_debug("%s: dev_type uevent() returned %d\n",
+			pr_debug("device: '%s': %s: dev_type uevent() "
+				 "returned %d\n", dev->bus_id,
 				 __FUNCTION__, retval);
 	}
 
@@ -325,7 +327,8 @@ static int device_add_groups(struct device *dev,
 			error = sysfs_create_group(&dev->kobj, groups[i]);
 			if (error) {
 				while (--i >= 0)
-					sysfs_remove_group(&dev->kobj, groups[i]);
+					sysfs_remove_group(&dev->kobj,
+							   groups[i]);
 				break;
 			}
 		}
@@ -401,20 +404,15 @@ static ssize_t show_dev(struct device *dev, struct device_attribute *attr,
 static struct device_attribute devt_attr =
 	__ATTR(dev, S_IRUGO, show_dev, NULL);
 
-/*
- *	devices_subsys - structure to be registered with kobject core.
- */
-
-decl_subsys(devices, &device_ktype, &device_uevent_ops);
-
+/* kset to create /sys/devices/  */
+struct kset *devices_kset;
 
 /**
- *	device_create_file - create sysfs attribute file for device.
- *	@dev:	device.
- *	@attr:	device attribute descriptor.
+ * device_create_file - create sysfs attribute file for device.
+ * @dev: device.
+ * @attr: device attribute descriptor.
  */
-
-int device_create_file(struct device * dev, struct device_attribute * attr)
+int device_create_file(struct device *dev, struct device_attribute *attr)
 {
 	int error = 0;
 	if (get_device(dev)) {
@@ -425,12 +423,11 @@ int device_create_file(struct device * dev, struct device_attribute * attr)
 }
 
 /**
- *	device_remove_file - remove sysfs attribute file.
- *	@dev:	device.
- *	@attr:	device attribute descriptor.
+ * device_remove_file - remove sysfs attribute file.
+ * @dev: device.
+ * @attr: device attribute descriptor.
  */
-
-void device_remove_file(struct device * dev, struct device_attribute * attr)
+void device_remove_file(struct device *dev, struct device_attribute *attr)
 {
 	if (get_device(dev)) {
 		sysfs_remove_file(&dev->kobj, &attr->attr);
@@ -511,22 +508,20 @@ static void klist_children_put(struct klist_node *n)
 	put_device(dev);
 }
 
-
 /**
- *	device_initialize - init device structure.
- *	@dev:	device.
+ * device_initialize - init device structure.
+ * @dev: device.
  *
- *	This prepares the device for use by other layers,
- *	including adding it to the device hierarchy.
- *	It is the first half of device_register(), if called by
- *	that, though it can also be called separately, so one
- *	may use @dev's fields (e.g. the refcount).
+ * This prepares the device for use by other layers,
+ * including adding it to the device hierarchy.
+ * It is the first half of device_register(), if called by
+ * that, though it can also be called separately, so one
+ * may use @dev's fields (e.g. the refcount).
  */
-
 void device_initialize(struct device *dev)
 {
-	kobj_set_kset_s(dev, devices_subsys);
-	kobject_init(&dev->kobj);
+	dev->kobj.kset = devices_kset;
+	kobject_init(&dev->kobj, &device_ktype);
 	klist_init(&dev->klist_children, klist_children_get,
 		   klist_children_put);
 	INIT_LIST_HEAD(&dev->dma_pools);
@@ -539,36 +534,39 @@ void device_initialize(struct device *dev)
 }
 
 #ifdef CONFIG_SYSFS_DEPRECATED
-static struct kobject * get_device_parent(struct device *dev,
-					  struct device *parent)
+static struct kobject *get_device_parent(struct device *dev,
+					 struct device *parent)
 {
-	/*
-	 * Set the parent to the class, not the parent device
-	 * for topmost devices in class hierarchy.
-	 * This keeps sysfs from having a symlink to make old
-	 * udevs happy
-	 */
+	/* class devices without a parent live in /sys/class/<classname>/ */
 	if (dev->class && (!parent || parent->class != dev->class))
 		return &dev->class->subsys.kobj;
+	/* all other devices keep their parent */
 	else if (parent)
 		return &parent->kobj;
 
 	return NULL;
 }
+
+static inline void cleanup_device_parent(struct device *dev) {}
+static inline void cleanup_glue_dir(struct device *dev,
+				    struct kobject *glue_dir) {}
 #else
 static struct kobject *virtual_device_parent(struct device *dev)
 {
 	static struct kobject *virtual_dir = NULL;
 
 	if (!virtual_dir)
-		virtual_dir = kobject_add_dir(&devices_subsys.kobj, "virtual");
+		virtual_dir = kobject_create_and_add("virtual",
+						     &devices_kset->kobj);
 
 	return virtual_dir;
 }
 
-static struct kobject * get_device_parent(struct device *dev,
-					  struct device *parent)
+static struct kobject *get_device_parent(struct device *dev,
+					 struct device *parent)
 {
+	int retval;
+
 	if (dev->class) {
 		struct kobject *kobj = NULL;
 		struct kobject *parent_kobj;
@@ -576,8 +574,8 @@ static struct kobject * get_device_parent(struct device *dev,
 
 		/*
 		 * If we have no parent, we live in "virtual".
-		 * Class-devices with a bus-device as parent, live
-		 * in a class-directory to prevent namespace collisions.
+		 * Class-devices with a non class-device as parent, live
+		 * in a "glue" directory to prevent namespace collisions.
 		 */
 		if (parent == NULL)
 			parent_kobj = virtual_device_parent(dev);
@@ -598,25 +596,45 @@ static struct kobject * get_device_parent(struct device *dev,
 			return kobj;
 
 		/* or create a new class-directory at the parent device */
-		return kobject_kset_add_dir(&dev->class->class_dirs,
-					    parent_kobj, dev->class->name);
+		k = kobject_create();
+		if (!k)
+			return NULL;
+		k->kset = &dev->class->class_dirs;
+		retval = kobject_add(k, parent_kobj, "%s", dev->class->name);
+		if (retval < 0) {
+			kobject_put(k);
+			return NULL;
+		}
+		/* do not emit an uevent for this simple "glue" directory */
+		return k;
 	}
 
 	if (parent)
 		return &parent->kobj;
 	return NULL;
 }
+
+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)
+		return;
+
+	kobject_put(glue_dir);
+}
+
+static void cleanup_device_parent(struct device *dev)
+{
+	cleanup_glue_dir(dev, dev->kobj.parent);
+}
 #endif
 
-static int setup_parent(struct device *dev, struct device *parent)
+static void setup_parent(struct device *dev, struct device *parent)
 {
 	struct kobject *kobj;
 	kobj = get_device_parent(dev, parent);
-	if (IS_ERR(kobj))
-		return PTR_ERR(kobj);
 	if (kobj)
 		dev->kobj.parent = kobj;
-	return 0;
 }
 
 static int device_add_class_symlinks(struct device *dev)
@@ -625,65 +643,76 @@ static int device_add_class_symlinks(struct device *dev)
 
 	if (!dev->class)
 		return 0;
+
 	error = sysfs_create_link(&dev->kobj, &dev->class->subsys.kobj,
 				  "subsystem");
 	if (error)
 		goto out;
-	/*
-	 * If this is not a "fake" compatible device, then create the
-	 * symlink from the class to the device.
-	 */
-	if (dev->kobj.parent != &dev->class->subsys.kobj) {
+
+#ifdef CONFIG_SYSFS_DEPRECATED
+	/* stacked class devices need a symlink in the class directory */
+	if (dev->kobj.parent != &dev->class->subsys.kobj &&
+	    dev->type != &part_type) {
 		error = sysfs_create_link(&dev->class->subsys.kobj, &dev->kobj,
 					  dev->bus_id);
 		if (error)
 			goto out_subsys;
 	}
-	if (dev->parent) {
-#ifdef CONFIG_SYSFS_DEPRECATED
-		{
-			struct device *parent = dev->parent;
-			char *class_name;
-
-			/*
-			 * In old sysfs stacked class devices had 'device'
-			 * link pointing to real device instead of parent
-			 */
-			while (parent->class && !parent->bus && parent->parent)
-				parent = parent->parent;
-
-			error = sysfs_create_link(&dev->kobj,
-						  &parent->kobj,
-						  "device");
-			if (error)
-				goto out_busid;
 
-			class_name = make_class_name(dev->class->name,
-							&dev->kobj);
-			if (class_name)
-				error = sysfs_create_link(&dev->parent->kobj,
-							&dev->kobj, class_name);
-			kfree(class_name);
-			if (error)
-				goto out_device;
-		}
-#else
-		error = sysfs_create_link(&dev->kobj, &dev->parent->kobj,
+	if (dev->parent && dev->type != &part_type) {
+		struct device *parent = dev->parent;
+		char *class_name;
+
+		/*
+		 * stacked class devices have the 'device' link
+		 * pointing to the bus device instead of the parent
+		 */
+		while (parent->class && !parent->bus && parent->parent)
+			parent = parent->parent;
+
+		error = sysfs_create_link(&dev->kobj,
+					  &parent->kobj,
 					  "device");
 		if (error)
 			goto out_busid;
-#endif
+
+		class_name = make_class_name(dev->class->name,
+						&dev->kobj);
+		if (class_name)
+			error = sysfs_create_link(&dev->parent->kobj,
+						&dev->kobj, class_name);
+		kfree(class_name);
+		if (error)
+			goto out_device;
 	}
 	return 0;
 
-#ifdef CONFIG_SYSFS_DEPRECATED
 out_device:
-	if (dev->parent)
+	if (dev->parent && dev->type != &part_type)
 		sysfs_remove_link(&dev->kobj, "device");
-#endif
 out_busid:
-	if (dev->kobj.parent != &dev->class->subsys.kobj)
+	if (dev->kobj.parent != &dev->class->subsys.kobj &&
+	    dev->type != &part_type)
 		sysfs_remove_link(&dev->class->subsys.kobj, dev->bus_id);
+#else
+	/* link in the class directory pointing to the device */
+	error = sysfs_create_link(&dev->class->subsys.kobj, &dev->kobj,
+				  dev->bus_id);
+	if (error)
+		goto out_subsys;
+
+	if (dev->parent && dev->type != &part_type) {
+		error = sysfs_create_link(&dev->kobj, &dev->parent->kobj,
+					  "device");
+		if (error)
+			goto out_busid;
+	}
+	return 0;
+
+out_busid:
+	sysfs_remove_link(&dev->class->subsys.kobj, dev->bus_id);
+#endif
+
 out_subsys:
 	sysfs_remove_link(&dev->kobj, "subsystem");
 out:
@@ -694,8 +723,9 @@ static void device_remove_class_symlinks(struct device *dev)
 {
 	if (!dev->class)
 		return;
-	if (dev->parent) {
+
 #ifdef CONFIG_SYSFS_DEPRECATED
+	if (dev->parent && dev->type != &part_type) {
 		char *class_name;
 
 		class_name = make_class_name(dev->class->name, &dev->kobj);
@@ -703,45 +733,59 @@ static void device_remove_class_symlinks(struct device *dev)
 			sysfs_remove_link(&dev->parent->kobj, class_name);
 			kfree(class_name);
 		}
-#endif
 		sysfs_remove_link(&dev->kobj, "device");
 	}
-	if (dev->kobj.parent != &dev->class->subsys.kobj)
+
+	if (dev->kobj.parent != &dev->class->subsys.kobj &&
+	    dev->type != &part_type)
 		sysfs_remove_link(&dev->class->subsys.kobj, dev->bus_id);
+#else
+	if (dev->parent && dev->type != &part_type)
+		sysfs_remove_link(&dev->kobj, "device");
+
+	sysfs_remove_link(&dev->class->subsys.kobj, dev->bus_id);
+#endif
+
 	sysfs_remove_link(&dev->kobj, "subsystem");
 }
 
 /**
- *	device_add - add device to device hierarchy.
- *	@dev:	device.
+ * device_add - add device to device hierarchy.
+ * @dev: device.
  *
- *	This is part 2 of device_register(), though may be called
- *	separately _iff_ device_initialize() has been called separately.
+ * This is part 2 of device_register(), though may be called
+ * separately _iff_ device_initialize() has been called separately.
  *
- *	This adds it to the kobject hierarchy via kobject_add(), adds it
- *	to the global and sibling lists for the device, then
- *	adds it to the other relevant subsystems of the driver model.
+ * This adds it to the kobject hierarchy via kobject_add(), adds it
+ * to the global and sibling lists for the device, then
+ * adds it to the other relevant subsystems of the driver model.
  */
 int device_add(struct device *dev)
 {
 	struct device *parent = NULL;
 	struct class_interface *class_intf;
-	int error = -EINVAL;
+	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))
+	if (!dev || !strlen(dev->bus_id)) {
+		error = -EINVAL;
 		goto Error;
+	}
 
-	pr_debug("DEV: registering device: ID = '%s'\n", dev->bus_id);
+	pr_debug("device: '%s': %s\n", dev->bus_id, __FUNCTION__);
 
 	parent = get_device(dev->parent);
-	error = setup_parent(dev, parent);
-	if (error)
-		goto Error;
+	setup_parent(dev, parent);
 
 	/* first, register with generic layer. */
-	kobject_set_name(&dev->kobj, "%s", dev->bus_id);
-	error = kobject_add(&dev->kobj);
+	error = kobject_add(&dev->kobj, dev->kobj.parent, "%s", dev->bus_id);
 	if (error)
 		goto Error;
 
@@ -751,7 +795,7 @@ int device_add(struct device *dev)
 
 	/* notify clients of device entry (new way) */
 	if (dev->bus)
-		blocking_notifier_call_chain(&dev->bus->bus_notifier,
+		blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
 					     BUS_NOTIFY_ADD_DEVICE, dev);
 
 	error = device_create_file(dev, &uevent_attr);
@@ -795,13 +839,14 @@ int device_add(struct device *dev)
 	}
  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->bus_notifier,
+		blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
 					     BUS_NOTIFY_DEL_DEVICE, dev);
 	device_remove_attrs(dev);
  AttrsError:
@@ -809,124 +854,84 @@ int device_add(struct device *dev)
  SymlinkError:
 	if (MAJOR(dev->devt))
 		device_remove_file(dev, &devt_attr);
-
-	if (dev->class) {
-		sysfs_remove_link(&dev->kobj, "subsystem");
-		/* If this is not a "fake" compatible device, remove the
-		 * symlink from the class to the device. */
-		if (dev->kobj.parent != &dev->class->subsys.kobj)
-			sysfs_remove_link(&dev->class->subsys.kobj,
-					  dev->bus_id);
-		if (parent) {
-#ifdef CONFIG_SYSFS_DEPRECATED
-			char *class_name = make_class_name(dev->class->name,
-							   &dev->kobj);
-			if (class_name)
-				sysfs_remove_link(&dev->parent->kobj,
-						  class_name);
-			kfree(class_name);
-#endif
-			sysfs_remove_link(&dev->kobj, "device");
-		}
-	}
  ueventattrError:
 	device_remove_file(dev, &uevent_attr);
  attrError:
 	kobject_uevent(&dev->kobj, KOBJ_REMOVE);
 	kobject_del(&dev->kobj);
  Error:
+	cleanup_device_parent(dev);
 	if (parent)
 		put_device(parent);
 	goto Done;
 }
 
-
 /**
- *	device_register - register a device with the system.
- *	@dev:	pointer to the device structure
+ * device_register - register a device with the system.
+ * @dev: pointer to the device structure
  *
- *	This happens in two clean steps - initialize the device
- *	and add it to the system. The two steps can be called
- *	separately, but this is the easiest and most common.
- *	I.e. you should only call the two helpers separately if
- *	have a clearly defined need to use and refcount the device
- *	before it is added to the hierarchy.
+ * This happens in two clean steps - initialize the device
+ * and add it to the system. The two steps can be called
+ * separately, but this is the easiest and most common.
+ * I.e. you should only call the two helpers separately if
+ * have a clearly defined need to use and refcount the device
+ * before it is added to the hierarchy.
  */
-
 int device_register(struct device *dev)
 {
 	device_initialize(dev);
 	return device_add(dev);
 }
 
-
 /**
- *	get_device - increment reference count for device.
- *	@dev:	device.
+ * get_device - increment reference count for device.
+ * @dev: device.
  *
- *	This simply forwards the call to kobject_get(), though
- *	we do take care to provide for the case that we get a NULL
- *	pointer passed in.
+ * This simply forwards the call to kobject_get(), though
+ * we do take care to provide for the case that we get a NULL
+ * pointer passed in.
  */
-
-struct device * get_device(struct device * dev)
+struct device *get_device(struct device *dev)
 {
 	return dev ? to_dev(kobject_get(&dev->kobj)) : NULL;
 }
 
-
 /**
- *	put_device - decrement reference count.
- *	@dev:	device in question.
+ * put_device - decrement reference count.
+ * @dev: device in question.
  */
-void put_device(struct device * dev)
+void put_device(struct device *dev)
 {
+	/* might_sleep(); */
 	if (dev)
 		kobject_put(&dev->kobj);
 }
 
-
 /**
- *	device_del - delete device from system.
- *	@dev:	device.
+ * device_del - delete device from system.
+ * @dev: device.
  *
- *	This is the first part of the device unregistration
- *	sequence. This removes the device from the lists we control
- *	from here, has it removed from the other driver model
- *	subsystems it was added to in device_add(), and removes it
- *	from the kobject hierarchy.
+ * This is the first part of the device unregistration
+ * sequence. This removes the device from the lists we control
+ * from here, has it removed from the other driver model
+ * subsystems it was added to in device_add(), and removes it
+ * from the kobject hierarchy.
  *
- *	NOTE: this should be called manually _iff_ device_add() was
- *	also called manually.
+ * NOTE: this should be called manually _iff_ device_add() was
+ * also called manually.
  */
-
-void device_del(struct device * dev)
+void device_del(struct device *dev)
 {
-	struct device * parent = dev->parent;
+	struct device *parent = dev->parent;
 	struct class_interface *class_intf;
 
+	device_pm_remove(dev);
 	if (parent)
 		klist_del(&dev->knode_parent);
 	if (MAJOR(dev->devt))
 		device_remove_file(dev, &devt_attr);
 	if (dev->class) {
-		sysfs_remove_link(&dev->kobj, "subsystem");
-		/* If this is not a "fake" compatible device, remove the
-		 * symlink from the class to the device. */
-		if (dev->kobj.parent != &dev->class->subsys.kobj)
-			sysfs_remove_link(&dev->class->subsys.kobj,
-					  dev->bus_id);
-		if (parent) {
-#ifdef CONFIG_SYSFS_DEPRECATED
-			char *class_name = make_class_name(dev->class->name,
-							   &dev->kobj);
-			if (class_name)
-				sysfs_remove_link(&dev->parent->kobj,
-						  class_name);
-			kfree(class_name);
-#endif
-			sysfs_remove_link(&dev->kobj, "device");
-		}
+		device_remove_class_symlinks(dev);
 
 		down(&dev->class->sem);
 		/* notify any interfaces that the device is now gone */
@@ -936,31 +941,6 @@ void device_del(struct device * dev)
 		/* remove the device from the class list */
 		list_del_init(&dev->node);
 		up(&dev->class->sem);
-
-		/* If we live in a parent class-directory, unreference it */
-		if (dev->kobj.parent->kset == &dev->class->class_dirs) {
-			struct device *d;
-			int other = 0;
-
-			/*
-			 * if we are the last child of our class, delete
-			 * our class-directory at this parent
-			 */
-			down(&dev->class->sem);
-			list_for_each_entry(d, &dev->class->devices, node) {
-				if (d == dev)
-					continue;
-				if (d->kobj.parent == dev->kobj.parent) {
-					other = 1;
-					break;
-				}
-			}
-			if (!other)
-				kobject_del(dev->kobj.parent);
-
-			kobject_put(dev->kobj.parent);
-			up(&dev->class->sem);
-		}
 	}
 	device_remove_file(dev, &uevent_attr);
 	device_remove_attrs(dev);
@@ -979,57 +959,55 @@ void device_del(struct device * dev)
 	if (platform_notify_remove)
 		platform_notify_remove(dev);
 	if (dev->bus)
-		blocking_notifier_call_chain(&dev->bus->bus_notifier,
+		blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
 					     BUS_NOTIFY_DEL_DEVICE, dev);
-	device_pm_remove(dev);
 	kobject_uevent(&dev->kobj, KOBJ_REMOVE);
+	cleanup_device_parent(dev);
 	kobject_del(&dev->kobj);
-	if (parent)
-		put_device(parent);
+	put_device(parent);
 }
 
 /**
- *	device_unregister - unregister device from system.
- *	@dev:	device going away.
+ * device_unregister - unregister device from system.
+ * @dev: device going away.
  *
- *	We do this in two parts, like we do device_register(). First,
- *	we remove it from all the subsystems with device_del(), then
- *	we decrement the reference count via put_device(). If that
- *	is the final reference count, the device will be cleaned up
- *	via device_release() above. Otherwise, the structure will
- *	stick around until the final reference to the device is dropped.
+ * We do this in two parts, like we do device_register(). First,
+ * we remove it from all the subsystems with device_del(), then
+ * we decrement the reference count via put_device(). If that
+ * is the final reference count, the device will be cleaned up
+ * via device_release() above. Otherwise, the structure will
+ * stick around until the final reference to the device is dropped.
  */
-void device_unregister(struct device * dev)
+void device_unregister(struct device *dev)
 {
-	pr_debug("DEV: Unregistering device. ID = '%s'\n", dev->bus_id);
+	pr_debug("device: '%s': %s\n", dev->bus_id, __FUNCTION__);
 	device_del(dev);
 	put_device(dev);
 }
 
-
-static struct device * next_device(struct klist_iter * i)
+static struct device *next_device(struct klist_iter *i)
 {
-	struct klist_node * n = klist_next(i);
+	struct klist_node *n = klist_next(i);
 	return n ? container_of(n, struct device, knode_parent) : NULL;
 }
 
 /**
- *	device_for_each_child - device child iterator.
- *	@parent: parent struct device.
- *	@data:	data for the callback.
- *	@fn:	function to be called for each device.
+ * device_for_each_child - device child iterator.
+ * @parent: parent struct device.
+ * @data: data for the callback.
+ * @fn: function to be called for each device.
  *
- *	Iterate over @parent's child devices, and call @fn for each,
- *	passing it @data.
+ * Iterate over @parent's child devices, and call @fn for each,
+ * passing it @data.
  *
- *	We check the return of @fn each time. If it returns anything
- *	other than 0, we break out and return that value.
+ * We check the return of @fn each time. If it returns anything
+ * other than 0, we break out and return that value.
  */
-int device_for_each_child(struct device * parent, void * data,
-		     int (*fn)(struct device *, void *))
+int device_for_each_child(struct device *parent, void *data,
+			  int (*fn)(struct device *dev, void *data))
 {
 	struct klist_iter i;
-	struct device * child;
+	struct device *child;
 	int error = 0;
 
 	klist_iter_init(&parent->klist_children, &i);
@@ -1054,8 +1032,8 @@ int device_for_each_child(struct device * parent, void * data,
  * current device can be obtained, this function will return to the caller
  * and not iterate over any more devices.
  */
-struct device * device_find_child(struct device *parent, void *data,
-				  int (*match)(struct device *, void *))
+struct device *device_find_child(struct device *parent, void *data,
+				 int (*match)(struct device *dev, void *data))
 {
 	struct klist_iter i;
 	struct device *child;
@@ -1073,7 +1051,10 @@ struct device * device_find_child(struct device *parent, void *data,
 
 int __init devices_init(void)
 {
-	return subsystem_register(&devices_subsys);
+	devices_kset = kset_create_and_add("devices", &device_uevent_ops, NULL);
+	if (!devices_kset)
+		return -ENOMEM;
+	return 0;
 }
 
 EXPORT_SYMBOL_GPL(device_for_each_child);
@@ -1094,7 +1075,7 @@ EXPORT_SYMBOL_GPL(device_remove_file);
 
 static void device_create_release(struct device *dev)
 {
-	pr_debug("%s called for %s\n", __FUNCTION__, dev->bus_id);
+	pr_debug("device: '%s': %s\n", dev->bus_id, __FUNCTION__);
 	kfree(dev);
 }
 
@@ -1156,14 +1137,11 @@ error:
 EXPORT_SYMBOL_GPL(device_create);
 
 /**
- * device_destroy - removes a device that was created with device_create()
+ * find_device - finds a device that was created with device_create()
  * @class: pointer to the struct class that this device was registered with
  * @devt: the dev_t of the device that was previously registered
- *
- * This call unregisters and cleans up a device that was created with a
- * call to device_create().
  */
-void device_destroy(struct class *class, dev_t devt)
+static struct device *find_device(struct class *class, dev_t devt)
 {
 	struct device *dev = NULL;
 	struct device *dev_tmp;
@@ -1176,12 +1154,54 @@ void device_destroy(struct class *class, dev_t devt)
 		}
 	}
 	up(&class->sem);
+	return dev;
+}
+
+/**
+ * device_destroy - removes a device that was created with device_create()
+ * @class: pointer to the struct class that this device was registered with
+ * @devt: the dev_t of the device that was previously registered
+ *
+ * This call unregisters and cleans up a device that was created with a
+ * call to device_create().
+ */
+void device_destroy(struct class *class, dev_t devt)
+{
+	struct device *dev;
 
+	dev = find_device(class, devt);
 	if (dev)
 		device_unregister(dev);
 }
 EXPORT_SYMBOL_GPL(device_destroy);
 
+#ifdef CONFIG_PM_SLEEP
+/**
+ * destroy_suspended_device - asks the PM core to remove a suspended device
+ * @class: pointer to the struct class that this device was registered with
+ * @devt: the dev_t of the device that was previously registered
+ *
+ * This call notifies the PM core of the necessity to unregister a suspended
+ * device created with a call to device_create() (devices cannot be
+ * unregistered directly while suspended, since the PM core holds their
+ * semaphores at that time).
+ *
+ * It can only be called within the scope of a system sleep transition.  In
+ * practice this means it has to be directly or indirectly invoked either by
+ * a suspend or resume method, or by the PM core (e.g. via
+ * disable_nonboot_cpus() or enable_nonboot_cpus()).
+ */
+void destroy_suspended_device(struct class *class, dev_t devt)
+{
+	struct device *dev;
+
+	dev = find_device(class, devt);
+	if (dev)
+		device_pm_schedule_removal(dev);
+}
+EXPORT_SYMBOL_GPL(destroy_suspended_device);
+#endif /* CONFIG_PM_SLEEP */
+
 /**
  * device_rename - renames a device
  * @dev: the pointer to the struct device to be renamed
@@ -1198,7 +1218,8 @@ int device_rename(struct device *dev, char *new_name)
 	if (!dev)
 		return -EINVAL;
 
-	pr_debug("DEVICE: renaming '%s' to '%s'\n", dev->bus_id, new_name);
+	pr_debug("device: '%s': %s: renaming to '%s'\n", dev->bus_id,
+		 __FUNCTION__, new_name);
 
 #ifdef CONFIG_SYSFS_DEPRECATED
 	if ((dev->class) && (dev->parent))
@@ -1279,8 +1300,7 @@ static int device_move_class_links(struct device *dev,
 					  class_name);
 		if (error)
 			sysfs_remove_link(&dev->kobj, "device");
-	}
-	else
+	} else
 		error = 0;
 out:
 	kfree(class_name);
@@ -1311,16 +1331,13 @@ int device_move(struct device *dev, struct device *new_parent)
 		return -EINVAL;
 
 	new_parent = get_device(new_parent);
-	new_parent_kobj = get_device_parent (dev, new_parent);
-	if (IS_ERR(new_parent_kobj)) {
-		error = PTR_ERR(new_parent_kobj);
-		put_device(new_parent);
-		goto out;
-	}
-	pr_debug("DEVICE: moving '%s' to '%s'\n", dev->bus_id,
-		 new_parent ? new_parent->bus_id : "<NULL>");
+	new_parent_kobj = get_device_parent(dev, new_parent);
+
+	pr_debug("device: '%s': %s: moving to '%s'\n", dev->bus_id,
+		 __FUNCTION__, new_parent ? new_parent->bus_id : "<NULL>");
 	error = kobject_move(&dev->kobj, new_parent_kobj);
 	if (error) {
+		cleanup_glue_dir(dev, new_parent_kobj);
 		put_device(new_parent);
 		goto out;
 	}
@@ -1343,6 +1360,7 @@ int device_move(struct device *dev, struct device *new_parent)
 				klist_add_tail(&dev->knode_parent,
 					       &old_parent->klist_children);
 		}
+		cleanup_glue_dir(dev, new_parent_kobj);
 		put_device(new_parent);
 		goto out;
 	}
@@ -1352,5 +1370,23 @@ out:
 	put_device(dev);
 	return error;
 }
-
 EXPORT_SYMBOL_GPL(device_move);
+
+/**
+ * device_shutdown - call ->shutdown() on each device to shutdown.
+ */
+void device_shutdown(void)
+{
+	struct device *dev, *devn;
+
+	list_for_each_entry_safe_reverse(dev, devn, &devices_kset->list,
+				kobj.entry) {
+		if (dev->bus && dev->bus->shutdown) {
+			dev_dbg(dev, "shutdown\n");
+			dev->bus->shutdown(dev);
+		} else if (dev->driver && dev->driver->shutdown) {
+			dev_dbg(dev, "shutdown\n");
+			dev->driver->shutdown(dev);
+		}
+	}
+}