diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 72cf08b..4ae17ed 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -3416,6 +3416,7 @@
 	if (total_errors > max_errors) {
 		printk(KERN_ERR "btrfs: %d errors while writing supers\n",
 		       total_errors);
+		mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
 
 		/* FUA is masked off if unsupported and can't be the reason */
 		btrfs_error(root->fs_info, -EIO,