[PATCH] btrfs: adjust order of unlocks in do_trimming()

[Su Yue]

In function do_trimming(), block_group->lock should be unlocked first.

Fixes: 7fe1e6415026 ("Btrfs: rewrite btrfs_trim_block_group()")
Signed-off-by: Su Yue <suy.f...@cn.fujitsu.com>
---
 fs/btrfs/free-space-cache.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c
index 4ba0aedc878b..3731fa92df56 100644
--- a/fs/btrfs/free-space-cache.c
+++ b/fs/btrfs/free-space-cache.c
@@ -3149,8 +3149,8 @@ static int do_trimming(struct btrfs_block_group_cache 
*block_group,
                        space_info->bytes_readonly += reserved_bytes;
                block_group->reserved -= reserved_bytes;
                space_info->bytes_reserved -= reserved_bytes;
-               spin_unlock(&space_info->lock);
                spin_unlock(&block_group->lock);
+               spin_unlock(&space_info->lock);
        }
 
        return ret;
-- 
2.19.1