diff --git a/drivers/md/md.c b/drivers/md/md.c
index 464627b..c068f17 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -305,6 +305,7 @@
  */
 void mddev_suspend(struct mddev *mddev)
 {
+	WARN_ON_ONCE(current == mddev->thread->tsk);
 	if (mddev->suspended++)
 		return;
 	synchronize_rcu();