Btrfs: properly clean up btrfs_end_io_wq_cache

In one of Dave's cleanup commits he forgot to call btrfs_end_io_wq_exit on
unload, which makes us unable to unload and then re-load the btrfs module.  This
fixes the problem.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fb.com>
Reviewed-by: David Sterba <dsterba@suse.cz>
Reviewed-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>
(cherry picked from commit 5ed5f5884116e3841da626d201ef068f23232a3a)

diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index a2b97ef10317081aebaa09aedeaddf4dec71a492..54bd91ece35b6c7a1f5b2cdce9e7be8c80d99e6f 100644 (file)
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -2151,6 +2151,7 @@ static void __exit exit_btrfs_fs(void)
        extent_map_exit();
        extent_io_exit();
        btrfs_interface_exit();
+       btrfs_end_io_wq_exit();
        unregister_filesystem(&btrfs_fs_type);
        btrfs_exit_sysfs();
        btrfs_cleanup_fs_uuids();