md: Free writes_pending in md_stop

dm raid calls md_stop to stop the raid device. It needs to
free the writes_pending here.

Signed-off-by: Xiao Ni <xni@redhat.com>
Signed-off-by: Song Liu <song@kernel.org>

diff --git a/drivers/md/md.c b/drivers/md/md.c
index da63708..0cf3402 100644 (file)
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -6265,6 +6265,7 @@ void md_stop(struct mddev *mddev)
         */
        __md_stop_writes(mddev);
        __md_stop(mddev);
+       percpu_ref_exit(&mddev->writes_pending);
        percpu_ref_exit(&mddev->active_io);
        bioset_exit(&mddev->bio_set);
        bioset_exit(&mddev->sync_set);