diff --git a/block/ioctl.c b/block/ioctl.c
index e3f5eb9..e06dbe9 100644
--- a/block/ioctl.c
+++ b/block/ioctl.c
@@ -82,7 +82,7 @@
 			fsync_bdev(bdevp);
 			invalidate_bdev(bdevp, 0);
 
-			mutex_lock(&bdev->bd_mutex);
+			mutex_lock_nested(&bdev->bd_mutex, 1);
 			delete_partition(disk, part);
 			mutex_unlock(&bdev->bd_mutex);
 			mutex_unlock(&bdevp->bd_mutex);