7 files changed, 39 insertions, 116 deletions

diff --git a/drivers/base/core.c b/drivers/base/core.c
index 9c0070b5bd3e..7de543d1d0b4 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -621,7 +621,8 @@ static struct kobject *get_device_parent(struct device *dev,
 static void cleanup_glue_dir(struct device *dev, struct kobject *glue_dir)
 {
         /* see if we live in a "glue" directory */
-        if (!dev->class || glue_dir->kset != &dev->class->class_dirs)
+        if (!glue_dir || !dev->class ||
+            glue_dir->kset != &dev->class->class_dirs)
                 return;
 
         kobject_put(glue_dir);
@@ -770,17 +771,10 @@ int device_add(struct device *dev)
         struct class_interface *class_intf;
         int error;
 
-        error = pm_sleep_lock();
-        if (error) {
-                dev_warn(dev, "Suspicious %s during suspend\n", __FUNCTION__);
-                dump_stack();
-                return error;
-        }
-
         dev = get_device(dev);
         if (!dev || !strlen(dev->bus_id)) {
                 error = -EINVAL;
-                goto Error;
+                goto Done;
         }
 
         pr_debug("device: '%s': %s\n", dev->bus_id, __FUNCTION__);
@@ -843,11 +837,9 @@ 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->p->bus_notifier,
diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
index ee9d1c8db0d6..d887d5cb5bef 100644
--- a/drivers/base/power/main.c
+++ b/drivers/base/power/main.c
@@ -48,7 +48,6 @@
  */
 
 LIST_HEAD(dpm_active);
-static LIST_HEAD(dpm_locked);
 static LIST_HEAD(dpm_off);
 static LIST_HEAD(dpm_off_irq);
 static LIST_HEAD(dpm_destroy);
@@ -81,28 +80,6 @@ void device_pm_add(struct device *dev)
  */
 void device_pm_remove(struct device *dev)
 {
-        /*
-         * If this function is called during a suspend, it will be blocked,
-         * because we're holding the device's semaphore at that time, which may
-         * lead to a deadlock.  In that case we want to print a warning.
-         * However, it may also be called by unregister_dropped_devices() with
-         * the device's semaphore released, in which case the warning should
-         * not be printed.
-         */
-        if (down_trylock(&dev->sem)) {
-                if (down_read_trylock(&pm_sleep_rwsem)) {
-                        /* No suspend in progress, wait on dev->sem */
-                        down(&dev->sem);
-                        up_read(&pm_sleep_rwsem);
-                } else {
-                        /* Suspend in progress, we may deadlock */
-                        dev_warn(dev, "Suspicious %s during suspend\n",
-                                __FUNCTION__);
-                        dump_stack();
-                        /* The user has been warned ... */
-                        down(&dev->sem);
-                }
-        }
         pr_debug("PM: Removing info for %s:%s\n",
                  dev->bus ? dev->bus->name : "No Bus",
                  kobject_name(&dev->kobj));
@@ -110,7 +87,6 @@ void device_pm_remove(struct device *dev)
         dpm_sysfs_remove(dev);
         list_del_init(&dev->power.entry);
         mutex_unlock(&dpm_list_mtx);
-        up(&dev->sem);
 }
 
 /**
@@ -230,6 +206,8 @@ static int resume_device(struct device *dev)
         TRACE_DEVICE(dev);
         TRACE_RESUME(0);
 
+        down(&dev->sem);
+
         if (dev->bus && dev->bus->resume) {
                 dev_dbg(dev,"resuming\n");
                 error = dev->bus->resume(dev);
@@ -245,6 +223,8 @@ static int resume_device(struct device *dev)
                 error = dev->class->resume(dev);
         }
 
+        up(&dev->sem);
+
         TRACE_RESUME(error);
         return error;
 }
@@ -266,7 +246,7 @@ static void dpm_resume(void)
                 struct list_head *entry = dpm_off.next;
                 struct device *dev = to_device(entry);
 
-                list_move_tail(entry, &dpm_locked);
+                list_move_tail(entry, &dpm_active);
                 mutex_unlock(&dpm_list_mtx);
                 resume_device(dev);
                 mutex_lock(&dpm_list_mtx);
@@ -275,25 +255,6 @@ static void dpm_resume(void)
 }
 
 /**
- *      unlock_all_devices - Release each device's semaphore
- *
- *      Go through the dpm_off list.  Put each device on the dpm_active
- *      list and unlock it.
- */
-static void unlock_all_devices(void)
-{
-        mutex_lock(&dpm_list_mtx);
-        while (!list_empty(&dpm_locked)) {
-                struct list_head *entry = dpm_locked.prev;
-                struct device *dev = to_device(entry);
-
-                list_move(entry, &dpm_active);
-                up(&dev->sem);
-        }
-        mutex_unlock(&dpm_list_mtx);
-}
-
-/**
  *      unregister_dropped_devices - Unregister devices scheduled for removal
  *
  *      Unregister all devices on the dpm_destroy list.
@@ -305,7 +266,6 @@ static void unregister_dropped_devices(void)
                 struct list_head *entry = dpm_destroy.next;
                 struct device *dev = to_device(entry);
 
-                up(&dev->sem);
                 mutex_unlock(&dpm_list_mtx);
                 /* This also removes the device from the list */
                 device_unregister(dev);
@@ -324,7 +284,6 @@ void device_resume(void)
 {
         might_sleep();
         dpm_resume();
-        unlock_all_devices();
         unregister_dropped_devices();
         up_write(&pm_sleep_rwsem);
 }
@@ -388,18 +347,15 @@ int device_power_down(pm_message_t state)
                 struct list_head *entry = dpm_off.prev;
                 struct device *dev = to_device(entry);
 
-                list_del_init(&dev->power.entry);
                 error = suspend_device_late(dev, state);
                 if (error) {
                         printk(KERN_ERR "Could not power down device %s: "
                                         "error %d\n",
                                         kobject_name(&dev->kobj), error);
-                        if (list_empty(&dev->power.entry))
-                                list_add(&dev->power.entry, &dpm_off);
                         break;
                 }
-                if (list_empty(&dev->power.entry))
-                        list_add(&dev->power.entry, &dpm_off_irq);
+                if (!list_empty(&dev->power.entry))
+                        list_move(&dev->power.entry, &dpm_off_irq);
         }
 
         if (!error)
@@ -419,6 +375,8 @@ static int suspend_device(struct device *dev, pm_message_t state)
 {
         int error = 0;
 
+        down(&dev->sem);
+
         if (dev->power.power_state.event) {
                 dev_dbg(dev, "PM: suspend %d-->%d\n",
                         dev->power.power_state.event, state.event);
@@ -441,6 +399,9 @@ static int suspend_device(struct device *dev, pm_message_t state)
                 error = dev->bus->suspend(dev, state);
                 suspend_report_result(dev->bus->suspend, error);
         }
+
+        up(&dev->sem);
+
         return error;
 }
 
@@ -461,13 +422,13 @@ static int dpm_suspend(pm_message_t state)
         int error = 0;
 
         mutex_lock(&dpm_list_mtx);
-        while (!list_empty(&dpm_locked)) {
-                struct list_head *entry = dpm_locked.prev;
+        while (!list_empty(&dpm_active)) {
+                struct list_head *entry = dpm_active.prev;
                 struct device *dev = to_device(entry);
 
-                list_del_init(&dev->power.entry);
                 mutex_unlock(&dpm_list_mtx);
                 error = suspend_device(dev, state);
+                mutex_lock(&dpm_list_mtx);
                 if (error) {
                         printk(KERN_ERR "Could not suspend device %s: "
                                         "error %d%s\n",
@@ -476,14 +437,10 @@ static int dpm_suspend(pm_message_t state)
                                         (error == -EAGAIN ?
                                         " (please convert to suspend_late)" :
                                         ""));
-                        mutex_lock(&dpm_list_mtx);
-                        if (list_empty(&dev->power.entry))
-                                list_add(&dev->power.entry, &dpm_locked);
                         break;
                 }
-                mutex_lock(&dpm_list_mtx);
-                if (list_empty(&dev->power.entry))
-                        list_add(&dev->power.entry, &dpm_off);
+                if (!list_empty(&dev->power.entry))
+                        list_move(&dev->power.entry, &dpm_off);
         }
         mutex_unlock(&dpm_list_mtx);
 
@@ -491,36 +448,6 @@ static int dpm_suspend(pm_message_t state)
 }
 
 /**
- *      lock_all_devices - Acquire every device's semaphore
- *
- *      Go through the dpm_active list. Carefully lock each device's
- *      semaphore and put it in on the dpm_locked list.
- */
-static void lock_all_devices(void)
-{
-        mutex_lock(&dpm_list_mtx);
-        while (!list_empty(&dpm_active)) {
-                struct list_head *entry = dpm_active.next;
-                struct device *dev = to_device(entry);
-
-                /* Required locking order is dev->sem first,
-                 * then dpm_list_mutex.  Hence this awkward code.
-                 */
-                get_device(dev);
-                mutex_unlock(&dpm_list_mtx);
-                down(&dev->sem);
-                mutex_lock(&dpm_list_mtx);
-
-                if (list_empty(entry))
-                        up(&dev->sem);          /* Device was removed */
-                else
-                        list_move_tail(entry, &dpm_locked);
-                put_device(dev);
-        }
-        mutex_unlock(&dpm_list_mtx);
-}
-
-/**
  *      device_suspend - Save state and stop all devices in system.
  *      @state: new power management state
  *
@@ -533,7 +460,6 @@ int device_suspend(pm_message_t state)
 
         might_sleep();
         down_write(&pm_sleep_rwsem);
-        lock_all_devices();
         error = dpm_suspend(state);
         if (error)
                 device_resume();
diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c
index f6f19908f5f0..1f0db51190cc 100644
--- a/drivers/usb/core/usb.c
+++ b/drivers/usb/core/usb.c
@@ -233,7 +233,7 @@ static int ksuspend_usb_init(void)
          * singlethreaded.  Its job doesn't justify running on more
          * than one CPU.
          */
-        ksuspend_usb_wq = create_singlethread_workqueue("ksuspend_usbd");
+        ksuspend_usb_wq = create_freezeable_workqueue("ksuspend_usbd");
         if (!ksuspend_usb_wq)
                 return -ENOMEM;
         return 0;
diff --git a/fs/debugfs/inode.c b/fs/debugfs/inode.c
index d26e2826ba5b..e9602d85c11d 100644
--- a/fs/debugfs/inode.c
+++ b/fs/debugfs/inode.c
@@ -29,10 +29,6 @@
 
 #define DEBUGFS_MAGIC   0x64626720
 
-/* declared over in file.c */
-extern struct file_operations debugfs_file_operations;
-extern struct inode_operations debugfs_link_operations;
-
 static struct vfsmount *debugfs_mount;
 static int debugfs_mount_count;
 
diff --git a/include/linux/debugfs.h b/include/linux/debugfs.h
index f592d6de3b97..7266124361b4 100644
--- a/include/linux/debugfs.h
+++ b/include/linux/debugfs.h
@@ -27,6 +27,11 @@ struct debugfs_blob_wrapper {
 };
 
 #if defined(CONFIG_DEBUG_FS)
+
+/* declared over in file.c */
+extern const struct file_operations debugfs_file_operations;
+extern const struct inode_operations debugfs_link_operations;
+
 struct dentry *debugfs_create_file(const char *name, mode_t mode,
                                    struct dentry *parent, void *data,
                                    const struct file_operations *fops);
diff --git a/init/Kconfig b/init/Kconfig
index 442850b984be..074ac97f55e3 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -382,9 +382,13 @@ config CGROUP_MEM_RES_CTLR
           sure you need the memory resource controller.
 
 config SYSFS_DEPRECATED
+        bool
+
+config SYSFS_DEPRECATED_V2
         bool "Create deprecated sysfs files"
         depends on SYSFS
         default y
+        select SYSFS_DEPRECATED
         help
           This option creates deprecated symlinks such as the
           "device"-link, the <subsystem>:<name>-link, and the
@@ -397,10 +401,11 @@ config SYSFS_DEPRECATED
 
           If enabled, this option will also move any device structures
           that belong to a class, back into the /sys/class hierarchy, in
-          order to support older versions of udev.
+          order to support older versions of udev and some userspace
+          programs.
 
-          If you are using a distro that was released in 2006 or later,
-          it should be safe to say N here.
+          If you are using a distro with the most recent userspace
+          packages, it should be safe to say N here.
 
 config PROC_PID_CPUSET
         bool "Include legacy /proc/<pid>/cpuset file"
diff --git a/lib/kobject.c b/lib/kobject.c
index d784daeb8571..0d03252f87a8 100644
--- a/lib/kobject.c
+++ b/lib/kobject.c
@@ -153,6 +153,10 @@ static void kobject_init_internal(struct kobject *kobj)
                 return;
         kref_init(&kobj->kref);
         INIT_LIST_HEAD(&kobj->entry);
+        kobj->state_in_sysfs = 0;
+        kobj->state_add_uevent_sent = 0;
+        kobj->state_remove_uevent_sent = 0;
+        kobj->state_initialized = 1;
 }
 
 
@@ -289,13 +293,8 @@ void kobject_init(struct kobject *kobj, struct kobj_type *ktype)
                 dump_stack();
         }
 
-        kref_init(&kobj->kref);
-        INIT_LIST_HEAD(&kobj->entry);
+        kobject_init_internal(kobj);
         kobj->ktype = ktype;
-        kobj->state_in_sysfs = 0;
-        kobj->state_add_uevent_sent = 0;
-        kobj->state_remove_uevent_sent = 0;
-        kobj->state_initialized = 1;
         return;
 
 error: