X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=drivers%2Fbase%2Fcore.c;h=068aa1c9538c99d54a47603e25f69544f084f537;hb=9d7d74029e0f5fde3b88b39892b9b9cfdf4ea10a;hp=67b79a7592a9d94c92d0e737d82638fdc5e7f74d;hpb=873481367edb18a7d0d7e5a285e6728c16bb44a9;p=safe%2Fjmp%2Flinux-2.6

diff --git a/drivers/base/core.c b/drivers/base/core.c
index 67b79a7..068aa1c 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -18,18 +18,31 @@
 #include <linux/string.h>
 #include <linux/kdev_t.h>
 #include <linux/notifier.h>
-
-#include <asm/semaphore.h>
+#include <linux/genhd.h>
+#include <linux/kallsyms.h>
+#include <linux/semaphore.h>
+#include <linux/mutex.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;
+static struct kobject *dev_kobj;
+struct kobject *sysfs_dev_char_kobj;
+struct kobject *sysfs_dev_block_kobj;
 
-/*
- * sysfs bindings for devices.
- */
+#ifdef CONFIG_BLOCK
+static inline int device_is_not_partition(struct device *dev)
+{
+	return !(dev->type == &part_type);
+}
+#else
+static inline int device_is_not_partition(struct device *dev)
+{
+	return 1;
+}
+#endif
 
 /**
  * dev_driver_string - Return a device's driver name, if at all possible
@@ -43,31 +56,35 @@ int (*platform_notify_remove)(struct device * dev) = NULL;
 const char *dev_driver_string(struct device *dev)
 {
 	return dev->driver ? dev->driver->name :
-			(dev->bus ? dev->bus->name : "");
+			(dev->bus ? dev->bus->name :
+			(dev->class ? dev->class->name : ""));
 }
 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)
 		ret = dev_attr->show(dev, dev_attr, buf);
+	if (ret >= (ssize_t)PAGE_SIZE) {
+		print_symbol("dev_attr_show: %s returned bad count\n",
+				(unsigned long)dev_attr->show);
+	}
 	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)
@@ -89,23 +106,23 @@ 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);
+	else if (dev->type && dev->type->release)
+		dev->type->release(dev);
 	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",
+	else
+		WARN(1, KERN_ERR "Device '%s' does not have a release() "
+			"function, it is broken and must be fixed.\n",
 			dev->bus_id);
-		WARN_ON(1);
-	}
 }
 
-static struct kobj_type ktype_device = {
+static struct kobj_type device_ktype = {
 	.release	= device_release,
 	.sysfs_ops	= &dev_sysfs_ops,
 };
@@ -115,8 +132,10 @@ static int dev_uevent_filter(struct kset *kset, struct kobject *kobj)
 {
 	struct kobj_type *ktype = get_ktype(kobj);
 
-	if (ktype == &ktype_device) {
+	if (ktype == &device_ktype) {
 		struct device *dev = to_dev(kobj);
+		if (dev->uevent_suppress)
+			return 0;
 		if (dev->bus)
 			return 1;
 		if (dev->class)
@@ -136,67 +155,79 @@ static const char *dev_uevent_name(struct kset *kset, struct kobject *kobj)
 	return NULL;
 }
 
-static int dev_uevent(struct kset *kset, struct kobject *kobj, char **envp,
-			int num_envp, char *buffer, int buffer_size)
+static int dev_uevent(struct kset *kset, struct kobject *kobj,
+		      struct kobj_uevent_env *env)
 {
 	struct device *dev = to_dev(kobj);
-	int i = 0;
-	int length = 0;
 	int retval = 0;
 
 	/* add the major/minor if present */
 	if (MAJOR(dev->devt)) {
-		add_uevent_var(envp, num_envp, &i,
-			       buffer, buffer_size, &length,
-			       "MAJOR=%u", MAJOR(dev->devt));
-		add_uevent_var(envp, num_envp, &i,
-			       buffer, buffer_size, &length,
-			       "MINOR=%u", MINOR(dev->devt));
+		add_uevent_var(env, "MAJOR=%u", MAJOR(dev->devt));
+		add_uevent_var(env, "MINOR=%u", MINOR(dev->devt));
 	}
 
-#ifdef CONFIG_SYSFS_DEPRECATED
-	/* add bus name (same as SUBSYSTEM, deprecated) */
-	if (dev->bus)
-		add_uevent_var(envp, num_envp, &i,
-			       buffer, buffer_size, &length,
-			       "PHYSDEVBUS=%s", dev->bus->name);
-#endif
+	if (dev->type && dev->type->name)
+		add_uevent_var(env, "DEVTYPE=%s", dev->type->name);
+
+	if (dev->driver)
+		add_uevent_var(env, "DRIVER=%s", dev->driver->name);
 
-	/* add driver name (PHYSDEV* values are deprecated)*/
-	if (dev->driver) {
-		add_uevent_var(envp, num_envp, &i,
-			       buffer, buffer_size, &length,
-			       "DRIVER=%s", dev->driver->name);
 #ifdef CONFIG_SYSFS_DEPRECATED
-		add_uevent_var(envp, num_envp, &i,
-			       buffer, buffer_size, &length,
-			       "PHYSDEVDRIVER=%s", dev->driver->name);
-#endif
-	}
+	if (dev->class) {
+		struct device *parent = dev->parent;
+
+		/* find first bus device in parent chain */
+		while (parent && !parent->bus)
+			parent = parent->parent;
+		if (parent && parent->bus) {
+			const char *path;
+
+			path = kobject_get_path(&parent->kobj, GFP_KERNEL);
+			if (path) {
+				add_uevent_var(env, "PHYSDEVPATH=%s", path);
+				kfree(path);
+			}
 
-	/* terminate, set to next free slot, shrink available space */
-	envp[i] = NULL;
-	envp = &envp[i];
-	num_envp -= i;
-	buffer = &buffer[length];
-	buffer_size -= length;
+			add_uevent_var(env, "PHYSDEVBUS=%s", parent->bus->name);
 
-	if (dev->bus && dev->bus->uevent) {
-		/* have the bus specific function add its stuff */
-		retval = dev->bus->uevent(dev, envp, num_envp, buffer, buffer_size);
-			if (retval) {
-			pr_debug ("%s - uevent() returned %d\n",
-				  __FUNCTION__, retval);
+			if (parent->driver)
+				add_uevent_var(env, "PHYSDEVDRIVER=%s",
+					       parent->driver->name);
 		}
+	} else if (dev->bus) {
+		add_uevent_var(env, "PHYSDEVBUS=%s", dev->bus->name);
+
+		if (dev->driver)
+			add_uevent_var(env, "PHYSDEVDRIVER=%s",
+				       dev->driver->name);
+	}
+#endif
+
+	/* have the bus specific function add its stuff */
+	if (dev->bus && dev->bus->uevent) {
+		retval = dev->bus->uevent(dev, env);
+		if (retval)
+			pr_debug("device: '%s': %s: bus uevent() returned %d\n",
+				 dev->bus_id, __func__, retval);
 	}
 
+	/* have the class specific function add its stuff */
 	if (dev->class && dev->class->dev_uevent) {
-		/* have the class specific function add its stuff */
-		retval = dev->class->dev_uevent(dev, envp, num_envp, buffer, buffer_size);
-			if (retval) {
-				pr_debug("%s - dev_uevent() returned %d\n",
-					 __FUNCTION__, retval);
-		}
+		retval = dev->class->dev_uevent(dev, env);
+		if (retval)
+			pr_debug("device: '%s': %s: class uevent() "
+				 "returned %d\n", dev->bus_id,
+				 __func__, retval);
+	}
+
+	/* have the device type specific fuction add its stuff */
+	if (dev->type && dev->type->uevent) {
+		retval = dev->type->uevent(dev, env);
+		if (retval)
+			pr_debug("device: '%s': %s: dev_type uevent() "
+				 "returned %d\n", dev->bus_id,
+				 __func__, retval);
 	}
 
 	return retval;
@@ -208,76 +239,174 @@ static struct kset_uevent_ops device_uevent_ops = {
 	.uevent =	dev_uevent,
 };
 
+static ssize_t show_uevent(struct device *dev, struct device_attribute *attr,
+			   char *buf)
+{
+	struct kobject *top_kobj;
+	struct kset *kset;
+	struct kobj_uevent_env *env = NULL;
+	int i;
+	size_t count = 0;
+	int retval;
+
+	/* search the kset, the device belongs to */
+	top_kobj = &dev->kobj;
+	while (!top_kobj->kset && top_kobj->parent)
+		top_kobj = top_kobj->parent;
+	if (!top_kobj->kset)
+		goto out;
+
+	kset = top_kobj->kset;
+	if (!kset->uevent_ops || !kset->uevent_ops->uevent)
+		goto out;
+
+	/* respect filter */
+	if (kset->uevent_ops && kset->uevent_ops->filter)
+		if (!kset->uevent_ops->filter(kset, &dev->kobj))
+			goto out;
+
+	env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL);
+	if (!env)
+		return -ENOMEM;
+
+	/* let the kset specific function add its keys */
+	retval = kset->uevent_ops->uevent(kset, &dev->kobj, env);
+	if (retval)
+		goto out;
+
+	/* copy keys to file */
+	for (i = 0; i < env->envp_idx; i++)
+		count += sprintf(&buf[count], "%s\n", env->envp[i]);
+out:
+	kfree(env);
+	return count;
+}
+
 static ssize_t store_uevent(struct device *dev, struct device_attribute *attr,
 			    const char *buf, size_t count)
 {
+	enum kobject_action action;
+
+	if (kobject_action_type(buf, count, &action) == 0) {
+		kobject_uevent(&dev->kobj, action);
+		goto out;
+	}
+
+	dev_err(dev, "uevent: unsupported action-string; this will "
+		     "be ignored in a future kernel version\n");
 	kobject_uevent(&dev->kobj, KOBJ_ADD);
+out:
 	return count;
 }
 
-static int device_add_groups(struct device *dev)
+static struct device_attribute uevent_attr =
+	__ATTR(uevent, S_IRUGO | S_IWUSR, show_uevent, store_uevent);
+
+static int device_add_attributes(struct device *dev,
+				 struct device_attribute *attrs)
+{
+	int error = 0;
+	int i;
+
+	if (attrs) {
+		for (i = 0; attr_name(attrs[i]); i++) {
+			error = device_create_file(dev, &attrs[i]);
+			if (error)
+				break;
+		}
+		if (error)
+			while (--i >= 0)
+				device_remove_file(dev, &attrs[i]);
+	}
+	return error;
+}
+
+static void device_remove_attributes(struct device *dev,
+				     struct device_attribute *attrs)
 {
 	int i;
+
+	if (attrs)
+		for (i = 0; attr_name(attrs[i]); i++)
+			device_remove_file(dev, &attrs[i]);
+}
+
+static int device_add_groups(struct device *dev,
+			     struct attribute_group **groups)
+{
 	int error = 0;
+	int i;
 
-	if (dev->groups) {
-		for (i = 0; dev->groups[i]; i++) {
-			error = sysfs_create_group(&dev->kobj, dev->groups[i]);
+	if (groups) {
+		for (i = 0; groups[i]; i++) {
+			error = sysfs_create_group(&dev->kobj, groups[i]);
 			if (error) {
 				while (--i >= 0)
-					sysfs_remove_group(&dev->kobj, dev->groups[i]);
-				goto out;
+					sysfs_remove_group(&dev->kobj,
+							   groups[i]);
+				break;
 			}
 		}
 	}
-out:
 	return error;
 }
 
-static void device_remove_groups(struct device *dev)
+static void device_remove_groups(struct device *dev,
+				 struct attribute_group **groups)
 {
 	int i;
-	if (dev->groups) {
-		for (i = 0; dev->groups[i]; i++) {
-			sysfs_remove_group(&dev->kobj, dev->groups[i]);
-		}
-	}
+
+	if (groups)
+		for (i = 0; groups[i]; i++)
+			sysfs_remove_group(&dev->kobj, groups[i]);
 }
 
 static int device_add_attrs(struct device *dev)
 {
 	struct class *class = dev->class;
-	int error = 0;
-	int i;
+	struct device_type *type = dev->type;
+	int error;
 
-	if (!class)
-		return 0;
+	if (class) {
+		error = device_add_attributes(dev, class->dev_attrs);
+		if (error)
+			return error;
+	}
 
-	if (class->dev_attrs) {
-		for (i = 0; attr_name(class->dev_attrs[i]); i++) {
-			error = device_create_file(dev, &class->dev_attrs[i]);
-			if (error)
-				break;
-		}
+	if (type) {
+		error = device_add_groups(dev, type->groups);
+		if (error)
+			goto err_remove_class_attrs;
 	}
+
+	error = device_add_groups(dev, dev->groups);
 	if (error)
-		while (--i >= 0)
-			device_remove_file(dev, &class->dev_attrs[i]);
+		goto err_remove_type_groups;
+
+	return 0;
+
+ err_remove_type_groups:
+	if (type)
+		device_remove_groups(dev, type->groups);
+ err_remove_class_attrs:
+	if (class)
+		device_remove_attributes(dev, class->dev_attrs);
+
 	return error;
 }
 
 static void device_remove_attrs(struct device *dev)
 {
 	struct class *class = dev->class;
-	int i;
+	struct device_type *type = dev->type;
 
-	if (!class)
-		return;
+	device_remove_groups(dev, dev->groups);
 
-	if (class->dev_attrs) {
-		for (i = 0; attr_name(class->dev_attrs[i]); i++)
-			device_remove_file(dev, &class->dev_attrs[i]);
-	}
+	if (type)
+		device_remove_groups(dev, type->groups);
+
+	if (class)
+		device_remove_attributes(dev, class->dev_attrs);
 }
 
 
@@ -287,41 +416,34 @@ static ssize_t show_dev(struct device *dev, struct device_attribute *attr,
 	return print_dev_t(buf, dev->devt);
 }
 
-/*
- *	devices_subsys - structure to be registered with kobject core.
- */
-
-decl_subsys(devices, &ktype_device, &device_uevent_ops);
+static struct device_attribute devt_attr =
+	__ATTR(dev, S_IRUGO, show_dev, NULL);
 
+/* 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)) {
+	if (dev)
 		error = sysfs_create_file(&dev->kobj, &attr->attr);
-		put_device(dev);
-	}
 	return error;
 }
 
 /**
- *	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)) {
+	if (dev)
 		sysfs_remove_file(&dev->kobj, &attr->attr);
-		put_device(dev);
-	}
 }
 
 /**
@@ -350,6 +472,39 @@ void device_remove_bin_file(struct device *dev, struct bin_attribute *attr)
 }
 EXPORT_SYMBOL_GPL(device_remove_bin_file);
 
+/**
+ * device_schedule_callback_owner - helper to schedule a callback for a device
+ * @dev: device.
+ * @func: callback function to invoke later.
+ * @owner: module owning the callback routine
+ *
+ * Attribute methods must not unregister themselves or their parent device
+ * (which would amount to the same thing).  Attempts to do so will deadlock,
+ * since unregistration is mutually exclusive with driver callbacks.
+ *
+ * Instead methods can call this routine, which will attempt to allocate
+ * and schedule a workqueue request to call back @func with @dev as its
+ * argument in the workqueue's process context.  @dev will be pinned until
+ * @func returns.
+ *
+ * This routine is usually called via the inline device_schedule_callback(),
+ * which automatically sets @owner to THIS_MODULE.
+ *
+ * Returns 0 if the request was submitted, -ENOMEM if storage could not
+ * be allocated, -ENODEV if a reference to @owner isn't available.
+ *
+ * NOTE: This routine won't work if CONFIG_SYSFS isn't set!  It uses an
+ * underlying sysfs routine (since it is intended for use by attribute
+ * methods), and if sysfs isn't available you'll get nothing but -ENOSYS.
+ */
+int device_schedule_callback_owner(struct device *dev,
+		void (*func)(struct device *), struct module *owner)
+{
+	return sysfs_schedule_callback(&dev->kobj,
+			(void (*)(void *)) func, dev, owner);
+}
+EXPORT_SYMBOL_GPL(device_schedule_callback_owner);
+
 static void klist_children_get(struct klist_node *n)
 {
 	struct device *dev = container_of(n, struct device, knode_parent);
@@ -364,110 +519,349 @@ 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);
 	INIT_LIST_HEAD(&dev->node);
 	init_MUTEX(&dev->sem);
+	spin_lock_init(&dev->devres_lock);
+	INIT_LIST_HEAD(&dev->devres_head);
 	device_init_wakeup(dev, 0);
 	set_dev_node(dev, -1);
 }
 
 #ifdef CONFIG_SYSFS_DEPRECATED
-static int setup_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 */
-	/* this keeps sysfs from having a symlink to make old udevs happy */
-	if (dev->class)
-		dev->kobj.parent = &dev->class->subsys.kset.kobj;
+	/* class devices without a parent live in /sys/class/<classname>/ */
+	if (dev->class && (!parent || parent->class != dev->class))
+		return &dev->class->p->class_subsys.kobj;
+	/* all other devices keep their parent */
 	else if (parent)
-		dev->kobj.parent = &parent->kobj;
+		return &parent->kobj;
 
-	return 0;
+	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 int virtual_device_parent(struct device *dev)
+static struct kobject *virtual_device_parent(struct device *dev)
 {
-	if (!dev->class)
-		return -ENODEV;
+	static struct kobject *virtual_dir = NULL;
+
+	if (!virtual_dir)
+		virtual_dir = kobject_create_and_add("virtual",
+						     &devices_kset->kobj);
+
+	return virtual_dir;
+}
 
-	if (!dev->class->virtual_dir) {
-		static struct kobject *virtual_dir = NULL;
+static struct kobject *get_device_parent(struct device *dev,
+					 struct device *parent)
+{
+	int retval;
 
-		if (!virtual_dir)
-			virtual_dir = kobject_add_dir(&devices_subsys.kset.kobj, "virtual");
-		dev->class->virtual_dir = kobject_add_dir(virtual_dir, dev->class->name);
+	if (dev->class) {
+		struct kobject *kobj = NULL;
+		struct kobject *parent_kobj;
+		struct kobject *k;
+
+		/*
+		 * If we have no parent, we live in "virtual".
+		 * 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);
+		else if (parent->class)
+			return &parent->kobj;
+		else
+			parent_kobj = &parent->kobj;
+
+		/* find our class-directory at the parent and reference it */
+		spin_lock(&dev->class->p->class_dirs.list_lock);
+		list_for_each_entry(k, &dev->class->p->class_dirs.list, entry)
+			if (k->parent == parent_kobj) {
+				kobj = kobject_get(k);
+				break;
+			}
+		spin_unlock(&dev->class->p->class_dirs.list_lock);
+		if (kobj)
+			return kobj;
+
+		/* or create a new class-directory at the parent device */
+		k = kobject_create();
+		if (!k)
+			return NULL;
+		k->kset = &dev->class->p->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;
 	}
 
-	dev->kobj.parent = dev->class->virtual_dir;
-	return 0;
+	if (parent)
+		return &parent->kobj;
+	return NULL;
 }
 
-static int setup_parent(struct device *dev, struct device *parent)
+static void cleanup_glue_dir(struct device *dev, struct kobject *glue_dir)
+{
+	/* see if we live in a "glue" directory */
+	if (!glue_dir || !dev->class ||
+	    glue_dir->kset != &dev->class->p->class_dirs)
+		return;
+
+	kobject_put(glue_dir);
+}
+
+static void cleanup_device_parent(struct device *dev)
+{
+	cleanup_glue_dir(dev, dev->kobj.parent);
+}
+#endif
+
+static void setup_parent(struct device *dev, struct device *parent)
+{
+	struct kobject *kobj;
+	kobj = get_device_parent(dev, parent);
+	if (kobj)
+		dev->kobj.parent = kobj;
+}
+
+static int device_add_class_symlinks(struct device *dev)
 {
 	int error;
 
-	/* if this is a class device, and has no parent, create one */
-	if ((dev->class) && (parent == NULL)) {
-		error = virtual_device_parent(dev);
+	if (!dev->class)
+		return 0;
+
+	error = sysfs_create_link(&dev->kobj,
+				  &dev->class->p->class_subsys.kobj,
+				  "subsystem");
+	if (error)
+		goto out;
+
+#ifdef CONFIG_SYSFS_DEPRECATED
+	/* stacked class devices need a symlink in the class directory */
+	if (dev->kobj.parent != &dev->class->p->class_subsys.kobj &&
+	    device_is_not_partition(dev)) {
+		error = sysfs_create_link(&dev->class->p->class_subsys.kobj,
+					  &dev->kobj, dev->bus_id);
 		if (error)
-			return error;
-	} else if (parent)
-		dev->kobj.parent = &parent->kobj;
+			goto out_subsys;
+	}
+
+	if (dev->parent && device_is_not_partition(dev)) {
+		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;
+
+		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;
+
+out_device:
+	if (dev->parent && device_is_not_partition(dev))
+		sysfs_remove_link(&dev->kobj, "device");
+out_busid:
+	if (dev->kobj.parent != &dev->class->p->class_subsys.kobj &&
+	    device_is_not_partition(dev))
+		sysfs_remove_link(&dev->class->p->class_subsys.kobj,
+				  dev->bus_id);
+#else
+	/* link in the class directory pointing to the device */
+	error = sysfs_create_link(&dev->class->p->class_subsys.kobj,
+				  &dev->kobj, dev->bus_id);
+	if (error)
+		goto out_subsys;
+
+	if (dev->parent && device_is_not_partition(dev)) {
+		error = sysfs_create_link(&dev->kobj, &dev->parent->kobj,
+					  "device");
+		if (error)
+			goto out_busid;
+	}
+	return 0;
+
+out_busid:
+	sysfs_remove_link(&dev->class->p->class_subsys.kobj, dev->bus_id);
+#endif
+
+out_subsys:
+	sysfs_remove_link(&dev->kobj, "subsystem");
+out:
+	return error;
 }
+
+static void device_remove_class_symlinks(struct device *dev)
+{
+	if (!dev->class)
+		return;
+
+#ifdef CONFIG_SYSFS_DEPRECATED
+	if (dev->parent && device_is_not_partition(dev)) {
+		char *class_name;
+
+		class_name = make_class_name(dev->class->name, &dev->kobj);
+		if (class_name) {
+			sysfs_remove_link(&dev->parent->kobj, class_name);
+			kfree(class_name);
+		}
+		sysfs_remove_link(&dev->kobj, "device");
+	}
+
+	if (dev->kobj.parent != &dev->class->p->class_subsys.kobj &&
+	    device_is_not_partition(dev))
+		sysfs_remove_link(&dev->class->p->class_subsys.kobj,
+				  dev->bus_id);
+#else
+	if (dev->parent && device_is_not_partition(dev))
+		sysfs_remove_link(&dev->kobj, "device");
+
+	sysfs_remove_link(&dev->class->p->class_subsys.kobj, dev->bus_id);
 #endif
 
+	sysfs_remove_link(&dev->kobj, "subsystem");
+}
+
+/**
+ * dev_set_name - set a device name
+ * @dev: device
+ * @fmt: format string for the device's name
+ */
+int dev_set_name(struct device *dev, const char *fmt, ...)
+{
+	va_list vargs;
+
+	va_start(vargs, fmt);
+	vsnprintf(dev->bus_id, sizeof(dev->bus_id), fmt, vargs);
+	va_end(vargs);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(dev_set_name);
+
+/**
+ * device_to_dev_kobj - select a /sys/dev/ directory for the device
+ * @dev: device
+ *
+ * By default we select char/ for new entries.  Setting class->dev_obj
+ * to NULL prevents an entry from being created.  class->dev_kobj must
+ * be set (or cleared) before any devices are registered to the class
+ * otherwise device_create_sys_dev_entry() and
+ * device_remove_sys_dev_entry() will disagree about the the presence
+ * of the link.
+ */
+static struct kobject *device_to_dev_kobj(struct device *dev)
+{
+	struct kobject *kobj;
+
+	if (dev->class)
+		kobj = dev->class->dev_kobj;
+	else
+		kobj = sysfs_dev_char_kobj;
+
+	return kobj;
+}
+
+static int device_create_sys_dev_entry(struct device *dev)
+{
+	struct kobject *kobj = device_to_dev_kobj(dev);
+	int error = 0;
+	char devt_str[15];
+
+	if (kobj) {
+		format_dev_t(devt_str, dev->devt);
+		error = sysfs_create_link(kobj, &dev->kobj, devt_str);
+	}
+
+	return error;
+}
+
+static void device_remove_sys_dev_entry(struct device *dev)
+{
+	struct kobject *kobj = device_to_dev_kobj(dev);
+	char devt_str[15];
+
+	if (kobj) {
+		format_dev_t(devt_str, dev->devt);
+		sysfs_remove_link(kobj, devt_str);
+	}
+}
+
 /**
- *	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;
-	char *class_name = NULL;
 	struct class_interface *class_intf;
-	int error = -EINVAL;
+	int error;
 
 	dev = get_device(dev);
-	if (!dev || !strlen(dev->bus_id))
-		goto Error;
+	if (!dev || !strlen(dev->bus_id)) {
+		error = -EINVAL;
+		goto Done;
+	}
 
-	pr_debug("DEV: registering device: ID = '%s'\n", dev->bus_id);
+	pr_debug("device: '%s': %s\n", dev->bus_id, __func__);
 
 	parent = get_device(dev->parent);
+	setup_parent(dev, parent);
 
-	error = setup_parent(dev, parent);
-	if (error)
-		goto Error;
+	/* use parent numa_node */
+	if (parent)
+		set_dev_node(dev, dev_to_node(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;
 
@@ -477,271 +871,227 @@ 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);
 
-	dev->uevent_attr.attr.name = "uevent";
-	dev->uevent_attr.attr.mode = S_IWUSR;
-	if (dev->driver)
-		dev->uevent_attr.attr.owner = dev->driver->owner;
-	dev->uevent_attr.store = store_uevent;
-	error = device_create_file(dev, &dev->uevent_attr);
+	error = device_create_file(dev, &uevent_attr);
 	if (error)
 		goto attrError;
 
 	if (MAJOR(dev->devt)) {
-		struct device_attribute *attr;
-		attr = kzalloc(sizeof(*attr), GFP_KERNEL);
-		if (!attr) {
-			error = -ENOMEM;
-			goto ueventattrError;
-		}
-		attr->attr.name = "dev";
-		attr->attr.mode = S_IRUGO;
-		if (dev->driver)
-			attr->attr.owner = dev->driver->owner;
-		attr->show = show_dev;
-		error = device_create_file(dev, attr);
-		if (error) {
-			kfree(attr);
+		error = device_create_file(dev, &devt_attr);
+		if (error)
 			goto ueventattrError;
-		}
 
-		dev->devt_attr = attr;
-	}
-
-	if (dev->class) {
-		sysfs_create_link(&dev->kobj, &dev->class->subsys.kset.kobj,
-				  "subsystem");
-		/* 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.kset.kobj)
-			sysfs_create_link(&dev->class->subsys.kset.kobj,
-					  &dev->kobj, dev->bus_id);
-#ifdef CONFIG_SYSFS_DEPRECATED
-		if (parent) {
-			sysfs_create_link(&dev->kobj, &dev->parent->kobj, "device");
-			class_name = make_class_name(dev->class->name, &dev->kobj);
-			sysfs_create_link(&dev->parent->kobj, &dev->kobj, class_name);
-		}
-#endif
+		error = device_create_sys_dev_entry(dev);
+		if (error)
+			goto devtattrError;
 	}
 
-	if ((error = device_add_attrs(dev)))
+	error = device_add_class_symlinks(dev);
+	if (error)
+		goto SymlinkError;
+	error = device_add_attrs(dev);
+	if (error)
 		goto AttrsError;
-	if ((error = device_add_groups(dev)))
-		goto GroupError;
-	if ((error = device_pm_add(dev)))
-		goto PMError;
-	if ((error = bus_add_device(dev)))
+	error = bus_add_device(dev);
+	if (error)
 		goto BusError;
+	error = device_pm_add(dev);
+	if (error)
+		goto PMError;
 	kobject_uevent(&dev->kobj, KOBJ_ADD);
-	if ((error = bus_attach_device(dev)))
-		goto AttachError;
+	bus_attach_device(dev);
 	if (parent)
 		klist_add_tail(&dev->knode_parent, &parent->klist_children);
 
 	if (dev->class) {
-		down(&dev->class->sem);
+		mutex_lock(&dev->class->p->class_mutex);
 		/* tie the class to the device */
-		list_add_tail(&dev->node, &dev->class->devices);
+		list_add_tail(&dev->node, &dev->class->p->class_devices);
 
 		/* notify any interfaces that the device is here */
-		list_for_each_entry(class_intf, &dev->class->interfaces, node)
+		list_for_each_entry(class_intf,
+				    &dev->class->p->class_interfaces, node)
 			if (class_intf->add_dev)
 				class_intf->add_dev(dev, class_intf);
-		up(&dev->class->sem);
+		mutex_unlock(&dev->class->p->class_mutex);
 	}
  Done:
- 	kfree(class_name);
 	put_device(dev);
 	return error;
- AttachError:
+ PMError:
 	bus_remove_device(dev);
  BusError:
-	device_pm_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_groups(dev);
- GroupError:
- 	device_remove_attrs(dev);
+	device_remove_attrs(dev);
  AttrsError:
-	if (dev->devt_attr) {
-		device_remove_file(dev, dev->devt_attr);
-		kfree(dev->devt_attr);
-	}
+	device_remove_class_symlinks(dev);
+ SymlinkError:
+	if (MAJOR(dev->devt))
+		device_remove_sys_dev_entry(dev);
+ devtattrError:
+	if (MAJOR(dev->devt))
+		device_remove_file(dev, &devt_attr);
  ueventattrError:
-	device_remove_file(dev, &dev->uevent_attr);
+	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 (dev->devt_attr) {
-		device_remove_file(dev, dev->devt_attr);
-		kfree(dev->devt_attr);
+	if (MAJOR(dev->devt)) {
+		device_remove_sys_dev_entry(dev);
+		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.kset.kobj)
-			sysfs_remove_link(&dev->class->subsys.kset.kobj,
-					  dev->bus_id);
-#ifdef CONFIG_SYSFS_DEPRECATED
-		if (parent) {
-			char *class_name = make_class_name(dev->class->name,
-							   &dev->kobj);
-			sysfs_remove_link(&dev->parent->kobj, class_name);
-			kfree(class_name);
-			sysfs_remove_link(&dev->kobj, "device");
-		}
-#endif
+		device_remove_class_symlinks(dev);
 
-		down(&dev->class->sem);
+		mutex_lock(&dev->class->p->class_mutex);
 		/* notify any interfaces that the device is now gone */
-		list_for_each_entry(class_intf, &dev->class->interfaces, node)
+		list_for_each_entry(class_intf,
+				    &dev->class->p->class_interfaces, node)
 			if (class_intf->remove_dev)
 				class_intf->remove_dev(dev, class_intf);
 		/* remove the device from the class list */
 		list_del_init(&dev->node);
-		up(&dev->class->sem);
+		mutex_unlock(&dev->class->p->class_mutex);
 	}
-	device_remove_file(dev, &dev->uevent_attr);
-	device_remove_groups(dev);
+	device_remove_file(dev, &uevent_attr);
 	device_remove_attrs(dev);
 	bus_remove_device(dev);
 
+	/*
+	 * Some platform devices are driven without driver attached
+	 * and managed resources may have been acquired.  Make sure
+	 * all resources are released.
+	 */
+	devres_release_all(dev);
+
 	/* Notify the platform of the removal, in case they
 	 * need to do anything...
 	 */
 	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, __func__);
 	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);
@@ -766,8 +1116,8 @@ 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;
@@ -785,7 +1135,28 @@ 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;
+	dev_kobj = kobject_create_and_add("dev", NULL);
+	if (!dev_kobj)
+		goto dev_kobj_err;
+	sysfs_dev_block_kobj = kobject_create_and_add("block", dev_kobj);
+	if (!sysfs_dev_block_kobj)
+		goto block_kobj_err;
+	sysfs_dev_char_kobj = kobject_create_and_add("char", dev_kobj);
+	if (!sysfs_dev_char_kobj)
+		goto char_kobj_err;
+
+	return 0;
+
+ char_kobj_err:
+	kobject_put(sysfs_dev_block_kobj);
+ block_kobj_err:
+	kobject_put(dev_kobj);
+ dev_kobj_err:
+	kset_unregister(devices_kset);
+	return -ENOMEM;
 }
 
 EXPORT_SYMBOL_GPL(device_for_each_child);
@@ -806,16 +1177,18 @@ 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, __func__);
 	kfree(dev);
 }
 
 /**
- * device_create - creates a device and registers it with sysfs
+ * device_create_vargs - creates a device and registers it with sysfs
  * @class: pointer to the struct class that this device should be registered to
  * @parent: pointer to the parent struct device of this new device, if any
  * @devt: the dev_t for the char device to be added
+ * @drvdata: the data to be added to the device for callbacks
  * @fmt: string for the device's name
+ * @args: va_list for the device's name
  *
  * This function can be used by char device classes.  A struct device
  * will be created in sysfs, registered to the specified class.
@@ -831,10 +1204,10 @@ static void device_create_release(struct device *dev)
  * Note: the struct class passed to this function must have previously
  * been created with a call to class_create().
  */
-struct device *device_create(struct class *class, struct device *parent,
-			     dev_t devt, const char *fmt, ...)
+struct device *device_create_vargs(struct class *class, struct device *parent,
+				   dev_t devt, void *drvdata, const char *fmt,
+				   va_list args)
 {
-	va_list args;
 	struct device *dev = NULL;
 	int retval = -ENODEV;
 
@@ -851,10 +1224,9 @@ struct device *device_create(struct class *class, struct device *parent,
 	dev->class = class;
 	dev->parent = parent;
 	dev->release = device_create_release;
+	dev_set_drvdata(dev, drvdata);
 
-	va_start(args, fmt);
 	vsnprintf(dev->bus_id, BUS_ID_SIZE, fmt, args);
-	va_end(args);
 	retval = device_register(dev);
 	if (retval)
 		goto error;
@@ -865,8 +1237,50 @@ error:
 	kfree(dev);
 	return ERR_PTR(retval);
 }
+EXPORT_SYMBOL_GPL(device_create_vargs);
+
+/**
+ * device_create - creates a device and registers it with sysfs
+ * @class: pointer to the struct class that this device should be registered to
+ * @parent: pointer to the parent struct device of this new device, if any
+ * @devt: the dev_t for the char device to be added
+ * @drvdata: the data to be added to the device for callbacks
+ * @fmt: string for the device's name
+ *
+ * This function can be used by char device classes.  A struct device
+ * will be created in sysfs, registered to the specified class.
+ *
+ * A "dev" file will be created, showing the dev_t for the device, if
+ * the dev_t is not 0,0.
+ * If a pointer to a parent struct device is passed in, the newly created
+ * struct device will be a child of that device in sysfs.
+ * The pointer to the struct device will be returned from the call.
+ * Any further sysfs files that might be required can be created using this
+ * pointer.
+ *
+ * Note: the struct class passed to this function must have previously
+ * been created with a call to class_create().
+ */
+struct device *device_create(struct class *class, struct device *parent,
+			     dev_t devt, void *drvdata, const char *fmt, ...)
+{
+	va_list vargs;
+	struct device *dev;
+
+	va_start(vargs, fmt);
+	dev = device_create_vargs(class, parent, devt, drvdata, fmt, vargs);
+	va_end(vargs);
+	return dev;
+}
 EXPORT_SYMBOL_GPL(device_create);
 
+static int __match_devt(struct device *dev, void *data)
+{
+	dev_t *devt = data;
+
+	return dev->devt == *devt;
+}
+
 /**
  * device_destroy - removes a device that was created with device_create()
  * @class: pointer to the struct class that this device was registered with
@@ -877,20 +1291,13 @@ EXPORT_SYMBOL_GPL(device_create);
  */
 void device_destroy(struct class *class, dev_t devt)
 {
-	struct device *dev = NULL;
-	struct device *dev_tmp;
-
-	down(&class->sem);
-	list_for_each_entry(dev_tmp, &class->devices, node) {
-		if (dev_tmp->devt == devt) {
-			dev = dev_tmp;
-			break;
-		}
-	}
-	up(&class->sem);
+	struct device *dev;
 
-	if (dev)
+	dev = class_find_device(class, NULL, &devt, __match_devt);
+	if (dev) {
+		put_device(dev);
 		device_unregister(dev);
+	}
 }
 EXPORT_SYMBOL_GPL(device_destroy);
 
@@ -903,120 +1310,133 @@ int device_rename(struct device *dev, char *new_name)
 {
 	char *old_class_name = NULL;
 	char *new_class_name = NULL;
-	char *old_symlink_name = NULL;
+	char *old_device_name = NULL;
 	int error;
 
 	dev = get_device(dev);
 	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,
+		 __func__, new_name);
 
 #ifdef CONFIG_SYSFS_DEPRECATED
 	if ((dev->class) && (dev->parent))
 		old_class_name = make_class_name(dev->class->name, &dev->kobj);
 #endif
 
-	if (dev->class) {
-		old_symlink_name = kmalloc(BUS_ID_SIZE, GFP_KERNEL);
-		if (!old_symlink_name) {
-			error = -ENOMEM;
-			goto out_free_old_class;
-		}
-		strlcpy(old_symlink_name, dev->bus_id, BUS_ID_SIZE);
+	old_device_name = kmalloc(BUS_ID_SIZE, GFP_KERNEL);
+	if (!old_device_name) {
+		error = -ENOMEM;
+		goto out;
 	}
-
+	strlcpy(old_device_name, dev->bus_id, BUS_ID_SIZE);
 	strlcpy(dev->bus_id, new_name, BUS_ID_SIZE);
 
 	error = kobject_rename(&dev->kobj, new_name);
+	if (error) {
+		strlcpy(dev->bus_id, old_device_name, BUS_ID_SIZE);
+		goto out;
+	}
 
 #ifdef CONFIG_SYSFS_DEPRECATED
 	if (old_class_name) {
 		new_class_name = make_class_name(dev->class->name, &dev->kobj);
 		if (new_class_name) {
-			sysfs_create_link(&dev->parent->kobj, &dev->kobj,
-					  new_class_name);
+			error = sysfs_create_link_nowarn(&dev->parent->kobj,
+							 &dev->kobj,
+							 new_class_name);
+			if (error)
+				goto out;
 			sysfs_remove_link(&dev->parent->kobj, old_class_name);
 		}
 	}
-#endif
-
+#else
 	if (dev->class) {
-		sysfs_remove_link(&dev->class->subsys.kset.kobj,
-				  old_symlink_name);
-		sysfs_create_link(&dev->class->subsys.kset.kobj, &dev->kobj,
-				  dev->bus_id);
+		error = sysfs_create_link_nowarn(&dev->class->p->class_subsys.kobj,
+						 &dev->kobj, dev->bus_id);
+		if (error)
+			goto out;
+		sysfs_remove_link(&dev->class->p->class_subsys.kobj,
+				  old_device_name);
 	}
+#endif
+
+out:
 	put_device(dev);
 
 	kfree(new_class_name);
-	kfree(old_symlink_name);
- out_free_old_class:
 	kfree(old_class_name);
+	kfree(old_device_name);
 
 	return error;
 }
-
+EXPORT_SYMBOL_GPL(device_rename);
 
 static int device_move_class_links(struct device *dev,
 				   struct device *old_parent,
 				   struct device *new_parent)
 {
+	int error = 0;
 #ifdef CONFIG_SYSFS_DEPRECATED
-	int error;
 	char *class_name;
 
 	class_name = make_class_name(dev->class->name, &dev->kobj);
 	if (!class_name) {
-		error = PTR_ERR(class_name);
-		class_name = NULL;
+		error = -ENOMEM;
 		goto out;
 	}
 	if (old_parent) {
 		sysfs_remove_link(&dev->kobj, "device");
 		sysfs_remove_link(&old_parent->kobj, class_name);
 	}
-	error = sysfs_create_link(&dev->kobj, &new_parent->kobj, "device");
-	if (error)
-		goto out;
-	error = sysfs_create_link(&new_parent->kobj, &dev->kobj, class_name);
-	if (error)
-		sysfs_remove_link(&dev->kobj, "device");
+	if (new_parent) {
+		error = sysfs_create_link(&dev->kobj, &new_parent->kobj,
+					  "device");
+		if (error)
+			goto out;
+		error = sysfs_create_link(&new_parent->kobj, &dev->kobj,
+					  class_name);
+		if (error)
+			sysfs_remove_link(&dev->kobj, "device");
+	} else
+		error = 0;
 out:
 	kfree(class_name);
 	return error;
 #else
-	return 0;
+	if (old_parent)
+		sysfs_remove_link(&dev->kobj, "device");
+	if (new_parent)
+		error = sysfs_create_link(&dev->kobj, &new_parent->kobj,
+					  "device");
+	return error;
 #endif
 }
 
 /**
  * device_move - moves a device to a new parent
  * @dev: the pointer to the struct device to be moved
- * @new_parent: the new parent of the device
+ * @new_parent: the new parent of the device (can by NULL)
  */
 int device_move(struct device *dev, struct device *new_parent)
 {
 	int error;
 	struct device *old_parent;
+	struct kobject *new_parent_kobj;
 
 	dev = get_device(dev);
 	if (!dev)
 		return -EINVAL;
 
-	if (!device_is_registered(dev)) {
-		error = -EINVAL;
-		goto out;
-	}
 	new_parent = get_device(new_parent);
-	if (!new_parent) {
-		error = -EINVAL;
-		goto out;
-	}
-	pr_debug("DEVICE: moving '%s' to '%s'\n", dev->bus_id,
-		new_parent->bus_id);
-	error = kobject_move(&dev->kobj, &new_parent->kobj);
+	new_parent_kobj = get_device_parent(dev, new_parent);
+
+	pr_debug("device: '%s': %s: moving to '%s'\n", dev->bus_id,
+		 __func__, 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;
 	}
@@ -1024,7 +1444,11 @@ int device_move(struct device *dev, struct device *new_parent)
 	dev->parent = new_parent;
 	if (old_parent)
 		klist_remove(&dev->knode_parent);
-	klist_add_tail(&dev->knode_parent, &new_parent->klist_children);
+	if (new_parent) {
+		klist_add_tail(&dev->knode_parent, &new_parent->klist_children);
+		set_dev_node(dev, dev_to_node(new_parent));
+	}
+
 	if (!dev->class)
 		goto out_put;
 	error = device_move_class_links(dev, old_parent, new_parent);
@@ -1032,11 +1456,16 @@ int device_move(struct device *dev, struct device *new_parent)
 		/* We ignore errors on cleanup since we're hosed anyway... */
 		device_move_class_links(dev, new_parent, old_parent);
 		if (!kobject_move(&dev->kobj, &old_parent->kobj)) {
-			klist_remove(&dev->knode_parent);
-			if (old_parent)
+			if (new_parent)
+				klist_remove(&dev->knode_parent);
+			dev->parent = old_parent;
+			if (old_parent) {
 				klist_add_tail(&dev->knode_parent,
 					       &old_parent->klist_children);
+				set_dev_node(dev, dev_to_node(old_parent));
+			}
 		}
+		cleanup_glue_dir(dev, new_parent_kobj);
 		put_device(new_parent);
 		goto out;
 	}
@@ -1046,5 +1475,26 @@ 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);
+		}
+	}
+	kobject_put(sysfs_dev_char_kobj);
+	kobject_put(sysfs_dev_block_kobj);
+	kobject_put(dev_kobj);
+}