diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 8bb4aa19898fb2b73a039b7f3ffd61fb70dd15f0..f00165de6fbf58b90408540a485fa0b1a5c656b4 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -369,7 +369,8 @@ static int verify_parent_transid(struct extent_io_tree *io_tree,
 out:
 	unlock_extent_cached(io_tree, eb->start, eb->start + eb->len - 1,
 			     &cached_state, GFP_NOFS);
-	btrfs_tree_read_unlock_blocking(eb);
+	if (need_lock)
+		btrfs_tree_read_unlock_blocking(eb);
 	return ret;
 }