Merge branch 'linus' into idle-test

8 files changed, 217 insertions, 212 deletions

diff --git a/drivers/base/base.h b/drivers/base/base.h
index 2ca7f5b7b82..19f49e41ce5 100644
--- a/drivers/base/base.h
+++ b/drivers/base/base.h
@@ -1,31 +1,46 @@
 
 /**
- * struct bus_type_private - structure to hold the private to the driver core portions of the bus_type structure.
+ * struct subsys_private - structure to hold the private to the driver core portions of the bus_type/class structure.
  *
- * @subsys - the struct kset that defines this bus.  This is the main kobject
- * @drivers_kset - the list of drivers associated with this bus
- * @devices_kset - the list of devices associated with this bus
+ * @subsys - the struct kset that defines this subsystem
+ * @devices_kset - the list of devices associated
+ *
+ * @drivers_kset - the list of drivers associated
  * @klist_devices - the klist to iterate over the @devices_kset
  * @klist_drivers - the klist to iterate over the @drivers_kset
  * @bus_notifier - the bus notifier list for anything that cares about things
- * on this bus.
+ *                 on this bus.
  * @bus - pointer back to the struct bus_type that this structure is associated
- * with.
+ *        with.
+ *
+ * @class_interfaces - list of class_interfaces associated
+ * @glue_dirs - "glue" directory to put in-between the parent device to
+ *              avoid namespace conflicts
+ * @class_mutex - mutex to protect the children, devices, and interfaces lists.
+ * @class - pointer back to the struct class that this structure is associated
+ *          with.
  *
  * This structure is the one that is the actual kobject allowing struct
- * bus_type to be statically allocated safely.  Nothing outside of the driver
- * core should ever touch these fields.
+ * bus_type/class to be statically allocated safely.  Nothing outside of the
+ * driver core should ever touch these fields.
  */
-struct bus_type_private {
+struct subsys_private {
 	struct kset subsys;
-	struct kset *drivers_kset;
 	struct kset *devices_kset;
+
+	struct kset *drivers_kset;
 	struct klist klist_devices;
 	struct klist klist_drivers;
 	struct blocking_notifier_head bus_notifier;
 	unsigned int drivers_autoprobe:1;
 	struct bus_type *bus;
+
+	struct list_head class_interfaces;
+	struct kset glue_dirs;
+	struct mutex class_mutex;
+	struct class *class;
 };
+#define to_subsys_private(obj) container_of(obj, struct subsys_private, subsys.kobj)
 
 struct driver_private {
 	struct kobject kobj;
@@ -36,33 +51,6 @@ struct driver_private {
 };
 #define to_driver(obj) container_of(obj, struct driver_private, kobj)
 
-
-/**
- * struct class_private - structure to hold the private to the driver core portions of the class structure.
- *
- * @class_subsys - the struct kset that defines this class.  This is the main kobject
- * @class_devices - list of devices associated with this class
- * @class_interfaces - list of class_interfaces associated with this class
- * @class_dirs - "glue" directory for virtual devices associated with this class
- * @class_mutex - mutex to protect the children, devices, and interfaces lists.
- * @class - pointer back to the struct class that this structure is associated
- * with.
- *
- * This structure is the one that is the actual kobject allowing struct
- * class to be statically allocated safely.  Nothing outside of the driver
- * core should ever touch these fields.
- */
-struct class_private {
-	struct kset class_subsys;
-	struct klist class_devices;
-	struct list_head class_interfaces;
-	struct kset class_dirs;
-	struct mutex class_mutex;
-	struct class *class;
-};
-#define to_class(obj)	\
-	container_of(obj, struct class_private, class_subsys.kobj)
-
 /**
  * struct device_private - structure to hold the private to the driver core portions of the device structure.
  *
diff --git a/drivers/base/bus.c b/drivers/base/bus.c
index 33c270a64db..e243bd49764 100644
--- a/drivers/base/bus.c
+++ b/drivers/base/bus.c
@@ -20,7 +20,6 @@
 #include "power/power.h"
 
 #define to_bus_attr(_attr) container_of(_attr, struct bus_attribute, attr)
-#define to_bus(obj) container_of(obj, struct bus_type_private, subsys.kobj)
 
 /*
  * sysfs bindings for drivers
@@ -96,11 +95,11 @@ static ssize_t bus_attr_show(struct kobject *kobj, struct attribute *attr,
 			     char *buf)
 {
 	struct bus_attribute *bus_attr = to_bus_attr(attr);
-	struct bus_type_private *bus_priv = to_bus(kobj);
+	struct subsys_private *subsys_priv = to_subsys_private(kobj);
 	ssize_t ret = 0;
 
 	if (bus_attr->show)
-		ret = bus_attr->show(bus_priv->bus, buf);
+		ret = bus_attr->show(subsys_priv->bus, buf);
 	return ret;
 }
 
@@ -108,11 +107,11 @@ static ssize_t bus_attr_store(struct kobject *kobj, struct attribute *attr,
 			      const char *buf, size_t count)
 {
 	struct bus_attribute *bus_attr = to_bus_attr(attr);
-	struct bus_type_private *bus_priv = to_bus(kobj);
+	struct subsys_private *subsys_priv = to_subsys_private(kobj);
 	ssize_t ret = 0;
 
 	if (bus_attr->store)
-		ret = bus_attr->store(bus_priv->bus, buf, count);
+		ret = bus_attr->store(subsys_priv->bus, buf, count);
 	return ret;
 }
 
@@ -858,9 +857,9 @@ static BUS_ATTR(uevent, S_IWUSR, NULL, bus_uevent_store);
 int bus_register(struct bus_type *bus)
 {
 	int retval;
-	struct bus_type_private *priv;
+	struct subsys_private *priv;
 
-	priv = kzalloc(sizeof(struct bus_type_private), GFP_KERNEL);
+	priv = kzalloc(sizeof(struct subsys_private), GFP_KERNEL);
 	if (!priv)
 		return -ENOMEM;
 
diff --git a/drivers/base/class.c b/drivers/base/class.c
index 9c63a5687d6..4f1df2e8fd7 100644
--- a/drivers/base/class.c
+++ b/drivers/base/class.c
@@ -27,7 +27,7 @@ static ssize_t class_attr_show(struct kobject *kobj, struct attribute *attr,
 			       char *buf)
 {
 	struct class_attribute *class_attr = to_class_attr(attr);
-	struct class_private *cp = to_class(kobj);
+	struct subsys_private *cp = to_subsys_private(kobj);
 	ssize_t ret = -EIO;
 
 	if (class_attr->show)
@@ -39,7 +39,7 @@ static ssize_t class_attr_store(struct kobject *kobj, struct attribute *attr,
 				const char *buf, size_t count)
 {
 	struct class_attribute *class_attr = to_class_attr(attr);
-	struct class_private *cp = to_class(kobj);
+	struct subsys_private *cp = to_subsys_private(kobj);
 	ssize_t ret = -EIO;
 
 	if (class_attr->store)
@@ -49,7 +49,7 @@ static ssize_t class_attr_store(struct kobject *kobj, struct attribute *attr,
 
 static void class_release(struct kobject *kobj)
 {
-	struct class_private *cp = to_class(kobj);
+	struct subsys_private *cp = to_subsys_private(kobj);
 	struct class *class = cp->class;
 
 	pr_debug("class '%s': release.\n", class->name);
@@ -65,7 +65,7 @@ static void class_release(struct kobject *kobj)
 
 static const struct kobj_ns_type_operations *class_child_ns_type(struct kobject *kobj)
 {
-	struct class_private *cp = to_class(kobj);
+	struct subsys_private *cp = to_subsys_private(kobj);
 	struct class *class = cp->class;
 
 	return class->ns_type;
@@ -82,7 +82,7 @@ static struct kobj_type class_ktype = {
 	.child_ns_type	= class_child_ns_type,
 };
 
-/* Hotplug events for classes go to the class class_subsys */
+/* Hotplug events for classes go to the class subsys */
 static struct kset *class_kset;
 
 
@@ -90,7 +90,7 @@ int class_create_file(struct class *cls, const struct class_attribute *attr)
 {
 	int error;
 	if (cls)
-		error = sysfs_create_file(&cls->p->class_subsys.kobj,
+		error = sysfs_create_file(&cls->p->subsys.kobj,
 					  &attr->attr);
 	else
 		error = -EINVAL;
@@ -100,20 +100,20 @@ int class_create_file(struct class *cls, const struct class_attribute *attr)
 void class_remove_file(struct class *cls, const struct class_attribute *attr)
 {
 	if (cls)
-		sysfs_remove_file(&cls->p->class_subsys.kobj, &attr->attr);
+		sysfs_remove_file(&cls->p->subsys.kobj, &attr->attr);
 }
 
 static struct class *class_get(struct class *cls)
 {
 	if (cls)
-		kset_get(&cls->p->class_subsys);
+		kset_get(&cls->p->subsys);
 	return cls;
 }
 
 static void class_put(struct class *cls)
 {
 	if (cls)
-		kset_put(&cls->p->class_subsys);
+		kset_put(&cls->p->subsys);
 }
 
 static int add_class_attrs(struct class *cls)
@@ -162,7 +162,7 @@ static void klist_class_dev_put(struct klist_node *n)
 
 int __class_register(struct class *cls, struct lock_class_key *key)
 {
-	struct class_private *cp;
+	struct subsys_private *cp;
 	int error;
 
 	pr_debug("device class '%s': registering\n", cls->name);
@@ -170,11 +170,11 @@ int __class_register(struct class *cls, struct lock_class_key *key)
 	cp = kzalloc(sizeof(*cp), GFP_KERNEL);
 	if (!cp)
 		return -ENOMEM;
-	klist_init(&cp->class_devices, klist_class_dev_get, klist_class_dev_put);
+	klist_init(&cp->klist_devices, klist_class_dev_get, klist_class_dev_put);
 	INIT_LIST_HEAD(&cp->class_interfaces);
-	kset_init(&cp->class_dirs);
+	kset_init(&cp->glue_dirs);
 	__mutex_init(&cp->class_mutex, "struct class mutex", key);
-	error = kobject_set_name(&cp->class_subsys.kobj, "%s", cls->name);
+	error = kobject_set_name(&cp->subsys.kobj, "%s", cls->name);
 	if (error) {
 		kfree(cp);
 		return error;
@@ -187,15 +187,15 @@ int __class_register(struct class *cls, struct lock_class_key *key)
 #if defined(CONFIG_BLOCK)
 	/* let the block class directory show up in the root of sysfs */
 	if (!sysfs_deprecated || cls != &block_class)
-		cp->class_subsys.kobj.kset = class_kset;
+		cp->subsys.kobj.kset = class_kset;
 #else
-	cp->class_subsys.kobj.kset = class_kset;
+	cp->subsys.kobj.kset = class_kset;
 #endif
-	cp->class_subsys.kobj.ktype = &class_ktype;
+	cp->subsys.kobj.ktype = &class_ktype;
 	cp->class = cls;
 	cls->p = cp;
 
-	error = kset_register(&cp->class_subsys);
+	error = kset_register(&cp->subsys);
 	if (error) {
 		kfree(cp);
 		return error;
@@ -210,7 +210,7 @@ void class_unregister(struct class *cls)
 {
 	pr_debug("device class '%s': unregistering\n", cls->name);
 	remove_class_attrs(cls);
-	kset_unregister(&cls->p->class_subsys);
+	kset_unregister(&cls->p->subsys);
 }
 
 static void class_create_release(struct class *cls)
@@ -295,7 +295,7 @@ void class_dev_iter_init(struct class_dev_iter *iter, struct class *class,
 
 	if (start)
 		start_knode = &start->knode_class;
-	klist_iter_init_node(&class->p->class_devices, &iter->ki, start_knode);
+	klist_iter_init_node(&class->p->klist_devices, &iter->ki, start_knode);
 	iter->type = type;
 }
 EXPORT_SYMBOL_GPL(class_dev_iter_init);
@@ -482,8 +482,8 @@ void class_interface_unregister(struct class_interface *class_intf)
 	class_put(parent);
 }
 
-ssize_t show_class_attr_string(struct class *class, struct class_attribute *attr,
-                        	char *buf)
+ssize_t show_class_attr_string(struct class *class,
+			       struct class_attribute *attr, char *buf)
 {
 	struct class_attribute_string *cs;
 	cs = container_of(attr, struct class_attribute_string, attr);
diff --git a/drivers/base/core.c b/drivers/base/core.c
index 6ed645411c4..080e9ca1101 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -338,6 +338,35 @@ static void device_remove_attributes(struct device *dev,
 			device_remove_file(dev, &attrs[i]);
 }
 
+static int device_add_bin_attributes(struct device *dev,
+				     struct bin_attribute *attrs)
+{
+	int error = 0;
+	int i;
+
+	if (attrs) {
+		for (i = 0; attr_name(attrs[i]); i++) {
+			error = device_create_bin_file(dev, &attrs[i]);
+			if (error)
+				break;
+		}
+		if (error)
+			while (--i >= 0)
+				device_remove_bin_file(dev, &attrs[i]);
+	}
+	return error;
+}
+
+static void device_remove_bin_attributes(struct device *dev,
+					 struct bin_attribute *attrs)
+{
+	int i;
+
+	if (attrs)
+		for (i = 0; attr_name(attrs[i]); i++)
+			device_remove_bin_file(dev, &attrs[i]);
+}
+
 static int device_add_groups(struct device *dev,
 			     const struct attribute_group **groups)
 {
@@ -378,12 +407,15 @@ static int device_add_attrs(struct device *dev)
 		error = device_add_attributes(dev, class->dev_attrs);
 		if (error)
 			return error;
+		error = device_add_bin_attributes(dev, class->dev_bin_attrs);
+		if (error)
+			goto err_remove_class_attrs;
 	}
 
 	if (type) {
 		error = device_add_groups(dev, type->groups);
 		if (error)
-			goto err_remove_class_attrs;
+			goto err_remove_class_bin_attrs;
 	}
 
 	error = device_add_groups(dev, dev->groups);
@@ -395,6 +427,9 @@ static int device_add_attrs(struct device *dev)
  err_remove_type_groups:
 	if (type)
 		device_remove_groups(dev, type->groups);
+ err_remove_class_bin_attrs:
+	if (class)
+		device_remove_bin_attributes(dev, class->dev_bin_attrs);
  err_remove_class_attrs:
 	if (class)
 		device_remove_attributes(dev, class->dev_attrs);
@@ -412,8 +447,10 @@ static void device_remove_attrs(struct device *dev)
 	if (type)
 		device_remove_groups(dev, type->groups);
 
-	if (class)
+	if (class) {
 		device_remove_attributes(dev, class->dev_attrs);
+		device_remove_bin_attributes(dev, class->dev_bin_attrs);
+	}
 }
 
 
@@ -610,7 +647,7 @@ class_dir_create_and_add(struct class *class, struct kobject *parent_kobj)
 	dir->class = class;
 	kobject_init(&dir->kobj, &class_dir_ktype);
 
-	dir->kobj.kset = &class->p->class_dirs;
+	dir->kobj.kset = &class->p->glue_dirs;
 
 	retval = kobject_add(&dir->kobj, parent_kobj, "%s", class->name);
 	if (retval < 0) {
@@ -635,7 +672,7 @@ static struct kobject *get_device_parent(struct device *dev,
 		if (sysfs_deprecated && dev->class == &block_class) {
 			if (parent && parent->class == &block_class)
 				return &parent->kobj;
-			return &block_class.p->class_subsys.kobj;
+			return &block_class.p->subsys.kobj;
 		}
 #endif
 
@@ -654,13 +691,13 @@ static struct kobject *get_device_parent(struct device *dev,
 		mutex_lock(&gdp_mutex);
 
 		/* 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)
+		spin_lock(&dev->class->p->glue_dirs.list_lock);
+		list_for_each_entry(k, &dev->class->p->glue_dirs.list, entry)
 			if (k->parent == parent_kobj) {
 				kobj = kobject_get(k);
 				break;
 			}
-		spin_unlock(&dev->class->p->class_dirs.list_lock);
+		spin_unlock(&dev->class->p->glue_dirs.list_lock);
 		if (kobj) {
 			mutex_unlock(&gdp_mutex);
 			return kobj;
@@ -682,7 +719,7 @@ 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)
+	    glue_dir->kset != &dev->class->p->glue_dirs)
 		return;
 
 	kobject_put(glue_dir);
@@ -709,7 +746,7 @@ static int device_add_class_symlinks(struct device *dev)
 		return 0;
 
 	error = sysfs_create_link(&dev->kobj,
-				  &dev->class->p->class_subsys.kobj,
+				  &dev->class->p->subsys.kobj,
 				  "subsystem");
 	if (error)
 		goto out;
@@ -728,7 +765,7 @@ static int device_add_class_symlinks(struct device *dev)
 #endif
 
 	/* link in the class directory pointing to the device */
-	error = sysfs_create_link(&dev->class->p->class_subsys.kobj,
+	error = sysfs_create_link(&dev->class->p->subsys.kobj,
 				  &dev->kobj, dev_name(dev));
 	if (error)
 		goto out_device;
@@ -756,7 +793,7 @@ static void device_remove_class_symlinks(struct device *dev)
 	if (sysfs_deprecated && dev->class == &block_class)
 		return;
 #endif
-	sysfs_delete_link(&dev->class->p->class_subsys.kobj, &dev->kobj, dev_name(dev));
+	sysfs_delete_link(&dev->class->p->subsys.kobj, &dev->kobj, dev_name(dev));
 }
 
 /**
@@ -947,7 +984,7 @@ int device_add(struct device *dev)
 		mutex_lock(&dev->class->p->class_mutex);
 		/* tie the class to the device */
 		klist_add_tail(&dev->knode_class,
-			       &dev->class->p->class_devices);
+			       &dev->class->p->klist_devices);
 
 		/* notify any interfaces that the device is here */
 		list_for_each_entry(class_intf,
@@ -1513,6 +1550,8 @@ EXPORT_SYMBOL_GPL(device_destroy);
  * exclusion between two different calls of device_rename
  * on the same device to ensure that new_name is valid and
  * won't conflict with other devices.
+ *
+ * "Never use this function, bad things will happen" - gregkh
  */
 int device_rename(struct device *dev, const char *new_name)
 {
@@ -1535,7 +1574,7 @@ int device_rename(struct device *dev, const char *new_name)
 	}
 
 	if (dev->class) {
-		error = sysfs_rename_link(&dev->class->p->class_subsys.kobj,
+		error = sysfs_rename_link(&dev->class->p->subsys.kobj,
 			&dev->kobj, old_device_name, new_name);
 		if (error)
 			goto out;
diff --git a/drivers/base/power/generic_ops.c b/drivers/base/power/generic_ops.c
index 81f2c84697f..42f97f92562 100644
--- a/drivers/base/power/generic_ops.c
+++ b/drivers/base/power/generic_ops.c
@@ -39,7 +39,7 @@ EXPORT_SYMBOL_GPL(pm_generic_runtime_idle);
  *
  * If PM operations are defined for the @dev's driver and they include
  * ->runtime_suspend(), execute it and return its error code.  Otherwise,
- * return -EINVAL.
+ * return 0.
  */
 int pm_generic_runtime_suspend(struct device *dev)
 {
@@ -58,7 +58,7 @@ EXPORT_SYMBOL_GPL(pm_generic_runtime_suspend);
  *
  * If PM operations are defined for the @dev's driver and they include
  * ->runtime_resume(), execute it and return its error code.  Otherwise,
- * return -EINVAL.
+ * return 0.
  */
 int pm_generic_runtime_resume(struct device *dev)
 {
@@ -185,7 +185,7 @@ static int __pm_generic_resume(struct device *dev, int event)
 		return 0;
 
 	ret = callback(dev);
-	if (!ret) {
+	if (!ret && pm_runtime_enabled(dev)) {
 		pm_runtime_disable(dev);
 		pm_runtime_set_active(dev);
 		pm_runtime_enable(dev);
diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
index ead3e79d6fc..2a52270aeb3 100644
--- a/drivers/base/power/main.c
+++ b/drivers/base/power/main.c
@@ -26,6 +26,7 @@
 #include <linux/interrupt.h>
 #include <linux/sched.h>
 #include <linux/async.h>
+#include <linux/suspend.h>
 
 #include "../base.h"
 #include "power.h"
@@ -41,16 +42,13 @@
  */
 
 LIST_HEAD(dpm_list);
+LIST_HEAD(dpm_prepared_list);
+LIST_HEAD(dpm_suspended_list);
+LIST_HEAD(dpm_noirq_list);
 
 static DEFINE_MUTEX(dpm_list_mtx);
 static pm_message_t pm_transition;
 
-/*
- * Set once the preparation of devices for a PM transition has started, reset
- * before starting to resume devices.  Protected by dpm_list_mtx.
- */
-static bool transition_started;
-
 static int async_error;
 
 /**
@@ -59,7 +57,7 @@ static int async_error;
  */
 void device_pm_init(struct device *dev)
 {
-	dev->power.status = DPM_ON;
+	dev->power.in_suspend = false;
 	init_completion(&dev->power.completion);
 	complete_all(&dev->power.completion);
 	dev->power.wakeup = NULL;
@@ -90,22 +88,11 @@ void device_pm_unlock(void)
 void device_pm_add(struct device *dev)
 {
 	pr_debug("PM: Adding info for %s:%s\n",
-		 dev->bus ? dev->bus->name : "No Bus",
-		 kobject_name(&dev->kobj));
+		 dev->bus ? dev->bus->name : "No Bus", dev_name(dev));
 	mutex_lock(&dpm_list_mtx);
-	if (dev->parent) {
-		if (dev->parent->power.status >= DPM_SUSPENDING)
-			dev_warn(dev, "parent %s should not be sleeping\n",
-				 dev_name(dev->parent));
-	} else if (transition_started) {
-		/*
-		 * We refuse to register parentless devices while a PM
-		 * transition is in progress in order to avoid leaving them
-		 * unhandled down the road
-		 */
-		dev_WARN(dev, "Parentless device registered during a PM transaction\n");
-	}
-
+	if (dev->parent && dev->parent->power.in_suspend)
+		dev_warn(dev, "parent %s should not be sleeping\n",
+			dev_name(dev->parent));
 	list_add_tail(&dev->power.entry, &dpm_list);
 	mutex_unlock(&dpm_list_mtx);
 }
@@ -117,8 +104,7 @@ void device_pm_add(struct device *dev)
 void device_pm_remove(struct device *dev)
 {
 	pr_debug("PM: Removing info for %s:%s\n",
-		 dev->bus ? dev->bus->name : "No Bus",
-		 kobject_name(&dev->kobj));
+		 dev->bus ? dev->bus->name : "No Bus", dev_name(dev));
 	complete_all(&dev->power.completion);
 	mutex_lock(&dpm_list_mtx);
 	list_del_init(&dev->power.entry);
@@ -135,10 +121,8 @@ void device_pm_remove(struct device *dev)
 void device_pm_move_before(struct device *deva, struct device *devb)
 {
 	pr_debug("PM: Moving %s:%s before %s:%s\n",
-		 deva->bus ? deva->bus->name : "No Bus",
-		 kobject_name(&deva->kobj),
-		 devb->bus ? devb->bus->name : "No Bus",
-		 kobject_name(&devb->kobj));
+		 deva->bus ? deva->bus->name : "No Bus", dev_name(deva),
+		 devb->bus ? devb->bus->name : "No Bus", dev_name(devb));
 	/* Delete deva from dpm_list and reinsert before devb. */
 	list_move_tail(&deva->power.entry, &devb->power.entry);
 }
@@ -151,10 +135,8 @@ void device_pm_move_before(struct device *deva, struct device *devb)
 void device_pm_move_after(struct device *deva, struct device *devb)
 {
 	pr_debug("PM: Moving %s:%s after %s:%s\n",
-		 deva->bus ? deva->bus->name : "No Bus",
-		 kobject_name(&deva->kobj),
-		 devb->bus ? devb->bus->name : "No Bus",
-		 kobject_name(&devb->kobj));
+		 deva->bus ? deva->bus->name : "No Bus", dev_name(deva),
+		 devb->bus ? devb->bus->name : "No Bus", dev_name(devb));
 	/* Delete deva from dpm_list and reinsert after devb. */
 	list_move(&deva->power.entry, &devb->power.entry);
 }
@@ -166,8 +148,7 @@ void device_pm_move_after(struct device *deva, struct device *devb)
 void device_pm_move_last(struct device *dev)
 {
 	pr_debug("PM: Moving %s:%s to end of list\n",
-		 dev->bus ? dev->bus->name : "No Bus",
-		 kobject_name(&dev->kobj));
+		 dev->bus ? dev->bus->name : "No Bus", dev_name(dev));
 	list_move_tail(&dev->power.entry, &dpm_list);
 }
 
@@ -303,7 +284,7 @@ static int pm_noirq_op(struct device *dev,
 			pm_message_t state)
 {
 	int error = 0;
-	ktime_t calltime, delta, rettime;
+	ktime_t calltime = ktime_set(0, 0), delta, rettime;
 
 	if (initcall_debug) {
 		pr_info("calling  %s+ @ %i, parent: %s\n",
@@ -405,7 +386,7 @@ static void pm_dev_err(struct device *dev, pm_message_t state, char *info,
 			int error)
 {
 	printk(KERN_ERR "PM: Device %s failed to %s%s: error %d\n",
-		kobject_name(&dev->kobj), pm_verb(state.event), info, error);
+		dev_name(dev), pm_verb(state.event), info, error);
 }
 
 static void dpm_show_time(ktime_t starttime, pm_message_t state, char *info)
@@ -475,33 +456,24 @@ End:
  */
 void dpm_resume_noirq(pm_message_t state)
 {
-	struct list_head list;
 	ktime_t starttime = ktime_get();
 
-	INIT_LIST_HEAD(&list);
 	mutex_lock(&dpm_list_mtx);
-	transition_started = false;
-	while (!list_empty(&dpm_list)) {
-		struct device *dev = to_device(dpm_list.next);
+	while (!list_empty(&dpm_noirq_list)) {
+		struct device *dev = to_device(dpm_noirq_list.next);
+		int error;
 
 		get_device(dev);
-		if (dev->power.status > DPM_OFF) {
-			int error;
-
-			dev->power.status = DPM_OFF;
-			mutex_unlock(&dpm_list_mtx);
+		list_move_tail(&dev->power.entry, &dpm_suspended_list);
+		mutex_unlock(&dpm_list_mtx);
 
-			error = device_resume_noirq(dev, state);
+		error = device_resume_noirq(dev, state);
+		if (error)
+			pm_dev_err(dev, state, " early", error);
 
-			mutex_lock(&dpm_list_mtx);
-			if (error)
-				pm_dev_err(dev, state, " early", error);
-		}
-		if (!list_empty(&dev->power.entry))
-			list_move_tail(&dev->power.entry, &list);
+		mutex_lock(&dpm_list_mtx);
 		put_device(dev);
 	}
-	list_splice(&list, &dpm_list);
 	mutex_unlock(&dpm_list_mtx);
 	dpm_show_time(starttime, state, "early");
 	resume_device_irqs();
@@ -544,7 +516,7 @@ static int device_resume(struct device *dev, pm_message_t state, bool async)
 	dpm_wait(dev->parent, async);
 	device_lock(dev);
 
-	dev->power.status = DPM_RESUMING;
+	dev->power.in_suspend = false;
 
 	if (dev->bus) {
 		if (dev->bus->pm) {
@@ -610,19 +582,14 @@ static bool is_async(struct device *dev)
  */
 static void dpm_resume(pm_message_t state)
 {
-	struct list_head list;
 	struct device *dev;
 	ktime_t starttime = ktime_get();
 
-	INIT_LIST_HEAD(&list);
 	mutex_lock(&dpm_list_mtx);
 	pm_transition = state;
 	async_error = 0;
 
-	list_for_each_entry(dev, &dpm_list, power.entry) {
-		if (dev->power.status < DPM_OFF)
-			continue;
-
+	list_for_each_entry(dev, &dpm_suspended_list, power.entry) {
 		INIT_COMPLETION(dev->power.completion);
 		if (is_async(dev)) {
 			get_device(dev);
@@ -630,28 +597,24 @@ static void dpm_resume(pm_message_t state)
 		}
 	}
 
-	while (!list_empty(&dpm_list)) {
-		dev = to_device(dpm_list.next);
+	while (!list_empty(&dpm_suspended_list)) {
+		dev = to_device(dpm_suspended_list.next);
 		get_device(dev);
-		if (dev->power.status >= DPM_OFF && !is_async(dev)) {
+		if (!is_async(dev)) {
 			int error;
 
 			mutex_unlock(&dpm_list_mtx);
 
 			error = device_resume(dev, state, false);
-
-			mutex_lock(&dpm_list_mtx);
 			if (error)
 				pm_dev_err(dev, state, "", error);
-		} else if (dev->power.status == DPM_SUSPENDING) {
-			/* Allow new children of the device to be registered */
-			dev->power.status = DPM_RESUMING;
+
+			mutex_lock(&dpm_list_mtx);
 		}
 		if (!list_empty(&dev->power.entry))
-			list_move_tail(&dev->power.entry, &list);
+			list_move_tail(&dev->power.entry, &dpm_prepared_list);
 		put_device(dev);
 	}
-	list_splice(&list, &dpm_list);
 	mutex_unlock(&dpm_list_mtx);
 	async_synchronize_full();
 	dpm_show_time(starttime, state, NULL);
@@ -697,22 +660,18 @@ static void dpm_complete(pm_message_t state)
 
 	INIT_LIST_HEAD(&list);
 	mutex_lock(&dpm_list_mtx);
-	transition_started = false;
-	while (!list_empty(&dpm_list)) {
-		struct device *dev = to_device(dpm_list.prev);
+	while (!list_empty(&dpm_prepared_list)) {
+		struct device *dev = to_device(dpm_prepared_list.prev);
 
 		get_device(dev);
-		if (dev->power.status > DPM_ON) {
-			dev->power.status = DPM_ON;
-			mutex_unlock(&dpm_list_mtx);
+		dev->power.in_suspend = false;
+		list_move(&dev->power.entry, &list);
+		mutex_unlock(&dpm_list_mtx);
 
-			device_complete(dev, state);
-			pm_runtime_put_sync(dev);
+		device_complete(dev, state);
+		pm_runtime_put_sync(dev);
 
-			mutex_lock(&dpm_list_mtx);
-		}
-		if (!list_empty(&dev->power.entry))
-			list_move(&dev->power.entry, &list);
+		mutex_lock(&dpm_list_mtx);
 		put_device(dev);
 	}
 	list_splice(&list, &dpm_list);
@@ -802,15 +761,13 @@ End:
  */
 int dpm_suspend_noirq(pm_message_t state)
 {
-	struct list_head list;
 	ktime_t starttime = ktime_get();
 	int error = 0;
 
-	INIT_LIST_HEAD(&list);
 	suspend_device_irqs();
 	mutex_lock(&dpm_list_mtx);
-	while (!list_empty(&dpm_list)) {
-		struct device *dev = to_device(dpm_list.prev);
+	while (!list_empty(&dpm_suspended_list)) {
+		struct device *dev = to_device(dpm_suspended_list.prev);
 
 		get_device(dev);
 		mutex_unlock(&dpm_list_mtx);
@@ -823,12 +780,10 @@ int dpm_suspend_noirq(pm_message_t state)
 			put_device(dev);
 			break;
 		}
-		dev->power.status = DPM_OFF_IRQ;
 		if (!list_empty(&dev->power.entry))
-			list_move(&dev->power.entry, &list);
+			list_move(&dev->power.entry, &dpm_noirq_list);
 		put_device(dev);
 	}
-	list_splice_tail(&list, &dpm_list);
 	mutex_unlock(&dpm_list_mtx);
 	if (error)
 		dpm_resume_noirq(resume_event(state));
@@ -876,6 +831,11 @@ static int __device_suspend(struct device *dev, pm_message_t state, bool async)
 	if (async_error)
 		goto End;
 
+	if (pm_wakeup_pending()) {
+		async_error = -EBUSY;
+		goto End;
+	}
+
 	if (dev->class) {
 		if (dev->class->pm) {
 			pm_dev_dbg(dev, state, "class ");
@@ -907,9 +867,6 @@ static int __device_suspend(struct device *dev, pm_message_t state, bool async)
 		}
 	}
 
-	if (!error)
-		dev->power.status = DPM_OFF;
-
  End:
 	device_unlock(dev);
 	complete_all(&dev->power.completion);
@@ -951,16 +908,14 @@ static int device_suspend(struct device *dev)
  */
 static int dpm_suspend(pm_message_t state)
 {
-	struct list_head list;
 	ktime_t starttime = ktime_get();
 	int error = 0;
 
-	INIT_LIST_HEAD(&list);
 	mutex_lock(&dpm_list_mtx);
 	pm_transition = state;
 	async_error = 0;
-	while (!list_empty(&dpm_list)) {
-		struct device *dev = to_device(dpm_list.prev);
+	while (!list_empty(&dpm_prepared_list)) {
+		struct device *dev = to_device(dpm_prepared_list.prev);
 
 		get_device(dev);
 		mutex_unlock(&dpm_list_mtx);
@@ -974,12 +929,11 @@ static int dpm_suspend(pm_message_t state)
 			break;
 		}
 		if (!list_empty(&dev->power.entry))
-			list_move(&dev->power.entry, &list);
+			list_move(&dev->power.entry, &dpm_suspended_list);
 		put_device(dev);
 		if (async_error)
 			break;
 	}
-	list_splice(&list, dpm_list.prev);
 	mutex_unlock(&dpm_list_mtx);
 	async_synchronize_full();
 	if (!error)
@@ -1038,22 +992,20 @@ static int device_prepare(struct device *dev, pm_message_t state)
  */
 static int dpm_prepare(pm_message_t state)
 {
-	struct list_head list;
 	int error = 0;
 
-	INIT_LIST_HEAD(&list);
 	mutex_lock(&dpm_list_mtx);
-	transition_started = true;
 	while (!list_empty(&dpm_list)) {
 		struct device *dev = to_device(dpm_list.next);
 
 		get_device(dev);
-		dev->power.status = DPM_PREPARING;
 		mutex_unlock(&dpm_list_mtx);
 
 		pm_runtime_get_noresume(dev);
-		if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) {
-			/* Wake-up requested during system sleep transition. */
+		if (pm_runtime_barrier(dev) && device_may_wakeup(dev))
+			pm_wakeup_event(dev, 0);
+
+		if (pm_wakeup_pending()) {
 			pm_runtime_put_sync(dev);
 			error = -EBUSY;
 		} else {
@@ -1062,24 +1014,22 @@ static int dpm_prepare(pm_message_t state)
 
 		mutex_lock(&dpm_list_mtx);
 		if (error) {
-			dev->power.status = DPM_ON;
 			if (error == -EAGAIN) {
 				put_device(dev);
 				error = 0;
 				continue;
 			}
-			printk(KERN_ERR "PM: Failed to prepare device %s "
-				"for power transition: error %d\n",
-				kobject_name(&dev->kobj), error);
+			printk(KERN_INFO "PM: Device %s not prepared "
+				"for power transition: code %d\n",
+				dev_name(dev), error);
 			put_device(dev);
 			break;
 		}
-		dev->power.status = DPM_SUSPENDING;
+		dev->power.in_suspend = true;
 		if (!list_empty(&dev->power.entry))
-			list_move_tail(&dev->power.entry, &list);
+			list_move_tail(&dev->power.entry, &dpm_prepared_list);
 		put_device(dev);
 	}
-	list_splice(&list, &dpm_list);
 	mutex_unlock(&dpm_list_mtx);
 	return error;
 }
diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c
index 02c652be83e..656493a5e07 100644
--- a/drivers/base/power/runtime.c
+++ b/drivers/base/power/runtime.c
@@ -250,13 +250,16 @@ static int rpm_callback(int (*cb)(struct device *), struct device *dev)
 	if (!cb)
 		return -ENOSYS;
 
-	spin_unlock_irq(&dev->power.lock);
+	if (dev->power.irq_safe) {
+		retval = cb(dev);
+	} else {
+		spin_unlock_irq(&dev->power.lock);
 
-	retval = cb(dev);
+		retval = cb(dev);
 
-	spin_lock_irq(&dev->power.lock);
+		spin_lock_irq(&dev->power.lock);
+	}
 	dev->power.runtime_error = retval;
-
 	return retval;
 }
 
@@ -404,7 +407,7 @@ static int rpm_suspend(struct device *dev, int rpmflags)
 		goto out;
 	}
 
-	if (parent && !parent->power.ignore_children) {
+	if (parent && !parent->power.ignore_children && !dev->power.irq_safe) {
 		spin_unlock_irq(&dev->power.lock);
 
 		pm_request_idle(parent);
@@ -527,10 +530,13 @@ static int rpm_resume(struct device *dev, int rpmflags)
 
 	if (!parent && dev->parent) {
 		/*
-		 * Increment the parent's resume counter and resume it if
-		 * necessary.
+		 * Increment the parent's usage counter and resume it if
+		 * necessary.  Not needed if dev is irq-safe; then the
+		 * parent is permanently resumed.
 		 */
 		parent = dev->parent;
+		if (dev->power.irq_safe)
+			goto skip_parent;
 		spin_unlock(&dev->power.lock);
 
 		pm_runtime_get_noresume(parent);
@@ -553,6 +559,7 @@ static int rpm_resume(struct device *dev, int rpmflags)
 			goto out;
 		goto repeat;
 	}
+ skip_parent:
 
 	if (dev->power.no_callbacks)
 		goto no_callback;	/* Assume success. */
@@ -584,7 +591,7 @@ static int rpm_resume(struct device *dev, int rpmflags)
 		rpm_idle(dev, RPM_ASYNC);
 
  out:
-	if (parent) {
+	if (parent && !dev->power.irq_safe) {
 		spin_unlock_irq(&dev->power.lock);
 
 		pm_runtime_put(parent);
@@ -1065,7 +1072,6 @@ EXPORT_SYMBOL_GPL(pm_runtime_allow);
  * Set the power.no_callbacks flag, which tells the PM core that this
  * device is power-managed through its parent and has no run-time PM
  * callbacks of its own.  The run-time sysfs attributes will be removed.
- *
  */
 void pm_runtime_no_callbacks(struct device *dev)
 {
@@ -1078,6 +1084,27 @@ void pm_runtime_no_callbacks(struct device *dev)
 EXPORT_SYMBOL_GPL(pm_runtime_no_callbacks);
 
 /**
+ * pm_runtime_irq_safe - Leave interrupts disabled during callbacks.
+ * @dev: Device to handle
+ *
+ * Set the power.irq_safe flag, which tells the PM core that the
+ * ->runtime_suspend() and ->runtime_resume() callbacks for this device should
+ * always be invoked with the spinlock held and interrupts disabled.  It also
+ * causes the parent's usage counter to be permanently incremented, preventing
+ * the parent from runtime suspending -- otherwise an irq-safe child might have
+ * to wait for a non-irq-safe parent.
+ */
+void pm_runtime_irq_safe(struct device *dev)
+{
+	if (dev->parent)
+		pm_runtime_get_sync(dev->parent);
+	spin_lock_irq(&dev->power.lock);
+	dev->power.irq_safe = 1;
+	spin_unlock_irq(&dev->power.lock);
+}
+EXPORT_SYMBOL_GPL(pm_runtime_irq_safe);
+
+/**
  * update_autosuspend - Handle a change to a device's autosuspend settings.
  * @dev: Device to handle.
  * @old_delay: The former autosuspend_delay value.
@@ -1199,4 +1226,6 @@ void pm_runtime_remove(struct device *dev)
 	/* Change the status back to 'suspended' to match the initial status. */
 	if (dev->power.runtime_status == RPM_ACTIVE)
 		pm_runtime_set_suspended(dev);
+	if (dev->power.irq_safe && dev->parent)
+		pm_runtime_put_sync(dev->parent);
 }
diff --git a/drivers/base/power/wakeup.c b/drivers/base/power/wakeup.c
index 71c5528e1c3..8ec406d8f54 100644
--- a/drivers/base/power/wakeup.c
+++ b/drivers/base/power/wakeup.c
@@ -542,26 +542,26 @@ static void pm_wakeup_update_hit_counts(void)
 }
 
 /**
- * pm_check_wakeup_events - Check for new wakeup events.
+ * pm_wakeup_pending - Check if power transition in progress should be aborted.
  *
  * Compare the current number of registered wakeup events with its preserved
- * value from the past to check if new wakeup events have been registered since
- * the old value was stored.  Check if the current number of wakeup events being
- * processed is zero.
+ * value from the past and return true if new wakeup events have been registered
+ * since the old value was stored.  Also return true if the current number of
+ * wakeup events being processed is different from zero.
  */
-bool pm_check_wakeup_events(void)
+bool pm_wakeup_pending(void)
 {
 	unsigned long flags;
-	bool ret = true;
+	bool ret = false;
 
 	spin_lock_irqsave(&events_lock, flags);
 	if (events_check_enabled) {
-		ret = ((unsigned int)atomic_read(&event_count) == saved_count)
-			&& !atomic_read(&events_in_progress);
-		events_check_enabled = ret;
+		ret = ((unsigned int)atomic_read(&event_count) != saved_count)
+			|| atomic_read(&events_in_progress);
+		events_check_enabled = !ret;
 	}
 	spin_unlock_irqrestore(&events_lock, flags);
-	if (!ret)
+	if (ret)
 		pm_wakeup_update_hit_counts();
 	return ret;
 }