[PATCH] Btrfs: reset path lock state to zero

[Liu Bo]

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 <raysl...@gmail.com>
Signed-off-by: Liu Bo <bo.li....@oracle.com>
---
 fs/btrfs/extent-tree.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 521e9d4..a71d457 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;
                        }
                }
-- 
1.7.7.6

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