Btrfs: reset path lock state to zero

We forgot to reset the path lock state to zero after we unlock the path block,
and this can lead to the ASSERT checker in tree unlock API.

Reported-by: Slava Barinov <rayslava@gmail.com>
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index aeba53191ece7285dedb5b4c4516a09473f9adb0..85b8454d9608ad36ca2be84c7b03bb2e042fb99f 100644 (file)
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -6788,11 +6788,13 @@ static noinline int walk_up_proc(struct btrfs_trans_handle *trans,
                                                       &wc->flags[level]);
                        if (ret < 0) {
                                btrfs_tree_unlock_rw(eb, path->locks[level]);
+                               path->locks[level] = 0;
                                return ret;
                        }
                        BUG_ON(wc->refs[level] == 0);
                        if (wc->refs[level] == 1) {
                                btrfs_tree_unlock_rw(eb, path->locks[level]);
+                               path->locks[level] = 0;
                                return 1;
                        }
                }