Merge branch 'acpi-hotplug'

* acpi-hotplug:
  PM / hibernate / memory hotplug: Rework mutual exclusion
  PM / hibernate: Create memory bitmaps after freezing user space
  ACPI / scan: Change ordering of locks for device hotplug

2 files changed, 37 insertions, 32 deletions

diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
index b26f5f1e773..0b78f72ad39 100644
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -644,22 +644,23 @@ int hibernate(void)
 	if (error)
 		goto Exit;
 
-	/* Allocate memory management structures */
-	error = create_basic_memory_bitmaps();
-	if (error)
-		goto Exit;
-
 	printk(KERN_INFO "PM: Syncing filesystems ... ");
 	sys_sync();
 	printk("done.\n");
 
 	error = freeze_processes();
 	if (error)
-		goto Free_bitmaps;
+		goto Exit;
+
+	lock_device_hotplug();
+	/* Allocate memory management structures */
+	error = create_basic_memory_bitmaps();
+	if (error)
+		goto Thaw;
 
 	error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM);
 	if (error || freezer_test_done)
-		goto Thaw;
+		goto Free_bitmaps;
 
 	if (in_suspend) {
 		unsigned int flags = 0;
@@ -682,14 +683,14 @@ int hibernate(void)
 		pr_debug("PM: Image restored successfully.\n");
 	}
 
+ Free_bitmaps:
+	free_basic_memory_bitmaps();
  Thaw:
+	unlock_device_hotplug();
 	thaw_processes();
 
 	/* Don't bother checking whether freezer_test_done is true */
 	freezer_test_done = false;
-
- Free_bitmaps:
-	free_basic_memory_bitmaps();
  Exit:
 	pm_notifier_call_chain(PM_POST_HIBERNATION);
 	pm_restore_console();
@@ -806,21 +807,20 @@ static int software_resume(void)
 	pm_prepare_console();
 	error = pm_notifier_call_chain(PM_RESTORE_PREPARE);
 	if (error)
-		goto close_finish;
-
-	error = create_basic_memory_bitmaps();
-	if (error)
-		goto close_finish;
+		goto Close_Finish;
 
 	pr_debug("PM: Preparing processes for restore.\n");
 	error = freeze_processes();
-	if (error) {
-		swsusp_close(FMODE_READ);
-		goto Done;
-	}
+	if (error)
+		goto Close_Finish;
 
 	pr_debug("PM: Loading hibernation image.\n");
 
+	lock_device_hotplug();
+	error = create_basic_memory_bitmaps();
+	if (error)
+		goto Thaw;
+
 	error = swsusp_read(&flags);
 	swsusp_close(FMODE_READ);
 	if (!error)
@@ -828,9 +828,10 @@ static int software_resume(void)
 
 	printk(KERN_ERR "PM: Failed to load hibernation image, recovering.\n");
 	swsusp_free();
-	thaw_processes();
- Done:
 	free_basic_memory_bitmaps();
+ Thaw:
+	unlock_device_hotplug();
+	thaw_processes();
  Finish:
 	pm_notifier_call_chain(PM_POST_RESTORE);
 	pm_restore_console();
@@ -840,7 +841,7 @@ static int software_resume(void)
 	mutex_unlock(&pm_mutex);
 	pr_debug("PM: Hibernation image not present or could not be loaded.\n");
 	return error;
-close_finish:
+ Close_Finish:
 	swsusp_close(FMODE_READ);
 	goto Finish;
 }
diff --git a/kernel/power/user.c b/kernel/power/user.c
index 4ed81e74f86..72e8f4fd616 100644
--- a/kernel/power/user.c
+++ b/kernel/power/user.c
@@ -60,11 +60,6 @@ static int snapshot_open(struct inode *inode, struct file *filp)
 		error = -ENOSYS;
 		goto Unlock;
 	}
-	if(create_basic_memory_bitmaps()) {
-		atomic_inc(&snapshot_device_available);
-		error = -ENOMEM;
-		goto Unlock;
-	}
 	nonseekable_open(inode, filp);
 	data = &snapshot_state;
 	filp->private_data = data;
@@ -90,10 +85,9 @@ static int snapshot_open(struct inode *inode, struct file *filp)
 		if (error)
 			pm_notifier_call_chain(PM_POST_RESTORE);
 	}
-	if (error) {
-		free_basic_memory_bitmaps();
+	if (error)
 		atomic_inc(&snapshot_device_available);
-	}
+
 	data->frozen = 0;
 	data->ready = 0;
 	data->platform_support = 0;
@@ -111,11 +105,11 @@ static int snapshot_release(struct inode *inode, struct file *filp)
 	lock_system_sleep();
 
 	swsusp_free();
-	free_basic_memory_bitmaps();
 	data = filp->private_data;
 	free_all_swap_pages(data->swap);
 	if (data->frozen) {
 		pm_restore_gfp_mask();
+		free_basic_memory_bitmaps();
 		thaw_processes();
 	}
 	pm_notifier_call_chain(data->mode == O_RDONLY ?
@@ -207,6 +201,7 @@ static long snapshot_ioctl(struct file *filp, unsigned int cmd,
 	if (!mutex_trylock(&pm_mutex))
 		return -EBUSY;
 
+	lock_device_hotplug();
 	data = filp->private_data;
 
 	switch (cmd) {
@@ -220,14 +215,22 @@ static long snapshot_ioctl(struct file *filp, unsigned int cmd,
 		printk("done.\n");
 
 		error = freeze_processes();
-		if (!error)
+		if (error)
+			break;
+
+		error = create_basic_memory_bitmaps();
+		if (error)
+			thaw_processes();
+		else
 			data->frozen = 1;
+
 		break;
 
 	case SNAPSHOT_UNFREEZE:
 		if (!data->frozen || data->ready)
 			break;
 		pm_restore_gfp_mask();
+		free_basic_memory_bitmaps();
 		thaw_processes();
 		data->frozen = 0;
 		break;
@@ -371,6 +374,7 @@ static long snapshot_ioctl(struct file *filp, unsigned int cmd,
 
 	}
 
+	unlock_device_hotplug();
 	mutex_unlock(&pm_mutex);
 
 	return error;