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>

1 files changed, 2 insertions, 0 deletions

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index aeba53191ece..85b8454d9608 100644
--- 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;
                         }
                 }