md: wake up 'resync_wait' at last in md_reap_sync_thread()

md_reap_sync_thread() is just replaced with wait_event(resync_wait, ...)
from action_store(), just make sure action_store() will still wait for
everything to be done in md_reap_sync_thread().
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Reviewd-by: Xiao Ni <xni@redhat.com>
Signed-off-by: Song Liu <song@kernel.org>
Link: https://lore.kernel.org/r/20230529132037.2124527-6-yukuai1@huaweicloud.com

drivers/md/md.c

@@ -9522,7 +9522,6 @@ void md_reap_sync_thread(struct mddev *mddev)
 	if (mddev_is_clustered(mddev) && is_reshaped
 				      && !test_bit(MD_CLOSING, &mddev->flags))
 		md_cluster_ops->update_size(mddev, old_dev_sectors);
-	wake_up(&resync_wait);
 	/* flag recovery needed just to double check */
 	set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
 	sysfs_notify_dirent_safe(mddev->sysfs_completed);
@@ -9530,6 +9529,7 @@ void md_reap_sync_thread(struct mddev *mddev)
 	md_new_event();
 	if (mddev->event_work.func)
 		queue_work(md_misc_wq, &mddev->event_work);
+	wake_up(&resync_wait);
 }
 EXPORT_SYMBOL(md_reap_sync_thread);