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

4 files changed, 43 insertions, 45 deletions

diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 61d090b6ce25..fbdb82e70d10 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -204,8 +204,6 @@ static int acpi_scan_hot_remove(struct acpi_device *device)
 		return -EINVAL;
 	}
 
-	lock_device_hotplug();
-
 	/*
 	 * Carry out two passes here and ignore errors in the first pass,
 	 * because if the devices in question are memory blocks and
@@ -236,9 +234,6 @@ static int acpi_scan_hot_remove(struct acpi_device *device)
 					    ACPI_UINT32_MAX,
 					    acpi_bus_online_companions, NULL,
 					    NULL, NULL);
-
-			unlock_device_hotplug();
-
 			put_device(&device->dev);
 			return -EBUSY;
 		}
@@ -249,8 +244,6 @@ static int acpi_scan_hot_remove(struct acpi_device *device)
 
 	acpi_bus_trim(device);
 
-	unlock_device_hotplug();
-
 	/* Device node has been unregistered. */
 	put_device(&device->dev);
 	device = NULL;
@@ -289,6 +282,7 @@ static void acpi_bus_device_eject(void *context)
 	u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
 	int error;
 
+	lock_device_hotplug();
 	mutex_lock(&acpi_scan_lock);
 
 	acpi_bus_get_device(handle, &device);
@@ -312,6 +306,7 @@ static void acpi_bus_device_eject(void *context)
 
  out:
 	mutex_unlock(&acpi_scan_lock);
+	unlock_device_hotplug();
 	return;
 
  err_out:
@@ -326,8 +321,8 @@ static void acpi_scan_bus_device_check(acpi_handle handle, u32 ost_source)
 	u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
 	int error;
 
-	mutex_lock(&acpi_scan_lock);
 	lock_device_hotplug();
+	mutex_lock(&acpi_scan_lock);
 
 	if (ost_source != ACPI_NOTIFY_BUS_CHECK) {
 		acpi_bus_get_device(handle, &device);
@@ -353,9 +348,9 @@ static void acpi_scan_bus_device_check(acpi_handle handle, u32 ost_source)
 		kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
 
  out:
-	unlock_device_hotplug();
 	acpi_evaluate_hotplug_ost(handle, ost_source, ost_code, NULL);
 	mutex_unlock(&acpi_scan_lock);
+	unlock_device_hotplug();
 }
 
 static void acpi_scan_bus_check(void *context)
@@ -446,6 +441,7 @@ void acpi_bus_hot_remove_device(void *context)
 	acpi_handle handle = device->handle;
 	int error;
 
+	lock_device_hotplug();
 	mutex_lock(&acpi_scan_lock);
 
 	error = acpi_scan_hot_remove(device);
@@ -455,6 +451,7 @@ void acpi_bus_hot_remove_device(void *context)
 					  NULL);
 
 	mutex_unlock(&acpi_scan_lock);
+	unlock_device_hotplug();
 	kfree(context);
 }
 EXPORT_SYMBOL(acpi_bus_hot_remove_device);
diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
index b26f5f1e773e..0b78f72ad39d 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 4ed81e74f86f..72e8f4fd616d 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;
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index ca1dd3aa5eee..53ad1325d7a7 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -51,14 +51,10 @@ DEFINE_MUTEX(mem_hotplug_mutex);
 void lock_memory_hotplug(void)
 {
 	mutex_lock(&mem_hotplug_mutex);
-
-	/* for exclusive hibernation if CONFIG_HIBERNATION=y */
-	lock_system_sleep();
 }
 
 void unlock_memory_hotplug(void)
 {
-	unlock_system_sleep();
 	mutex_unlock(&mem_hotplug_mutex);
 }