btrfs: add missing mutex_unlock in btrfs_relocate_sys_chunks()

commit 9af503d91298c3f2945e73703f0e00995be08c30 upstream.

The previous patch that replaced BUG_ON by error handling forgot to
unlock the mutex in the error path.

Link: https://lore.kernel.org/all/Zh%2fHpAGFqa7YAFuM@duo.ucw.cz
Reported-by: Pavel Machek <pavel@denx.de>
Fixes: 7411055db5ce ("btrfs: handle chunk tree lookup error in btrfs_relocate_sys_chunks()")
CC: stable@vger.kernel.org
Reviewed-by: Pavel Machek <pavel@denx.de>
Signed-off-by: Dominique Martinet <dominique.martinet@atmark-techno.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 2a0d44fd2dd9835d2409b6131b97a9ed5ac5b64c..b5e2daf538d49801ced4ec4e8905db872a4bc83b 100644 (file)
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -3374,6 +3374,7 @@ again:
                         * alignment and size).
                         */
                        ret = -EUCLEAN;
+                       mutex_unlock(&fs_info->reclaim_bgs_lock);
                        goto error;
                }