diff --git a/[refs] b/[refs]
index 1ed6932d0141..90532d3b3b59 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 37be41241f43109c55d92cdbf303399eea642f14
+refs/heads/master: 6796bf54a64df36f96a42ae222423fffe36c58a5
diff --git a/trunk/fs/block_dev.c b/trunk/fs/block_dev.c
index 19f5f153ddb8..846f32d51be7 100644
--- a/trunk/fs/block_dev.c
+++ b/trunk/fs/block_dev.c
@@ -920,7 +920,7 @@ static int do_open(struct block_device *bdev, struct file *file, int for_part)
 	}
 	owner = disk->fops->owner;
 
-	mutex_lock(&bdev->bd_mutex);
+	mutex_lock_nested(&bdev->bd_mutex, for_part);
 	if (!bdev->bd_openers) {
 		bdev->bd_disk = disk;
 		bdev->bd_contains = bdev;
@@ -1062,7 +1062,7 @@ static int __blkdev_put(struct block_device *bdev, int for_part)
 	struct gendisk *disk = bdev->bd_disk;
 	struct block_device *victim = NULL;
 
-	mutex_lock(&bdev->bd_mutex);
+	mutex_lock_nested(&bdev->bd_mutex, for_part);
 	lock_kernel();
 	if (for_part)
 		bdev->bd_part_count--;