diff --git a/drivers/md/md.c b/drivers/md/md.c
index 583c7a1fc5bd..58fc0187122d 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -6040,9 +6040,8 @@ static int md_thread(void * arg)
 			 || kthread_should_stop(),
 			 thread->timeout);
 
-		clear_bit(THREAD_WAKEUP, &thread->flags);
-
-		thread->run(thread->mddev);
+		if (test_and_clear_bit(THREAD_WAKEUP, &thread->flags))
+			thread->run(thread->mddev);
 	}
 
 	return 0;
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 84718383124d..838c275fd3c8 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -2396,13 +2396,13 @@ static int run(mddev_t *mddev)
 	return 0;
 
 out_free_conf:
+	md_unregister_thread(mddev->thread);
 	if (conf->r10bio_pool)
 		mempool_destroy(conf->r10bio_pool);
 	safe_put_page(conf->tmppage);
 	kfree(conf->mirrors);
 	kfree(conf);
 	mddev->private = NULL;
-	md_unregister_thread(mddev->thread);
 out:
 	return -EIO;
 }