diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index dc2ea636d173..2fa1f270fb1d 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -7177,6 +7177,8 @@ raid5_store_group_thread_cnt(struct mddev *mddev, const char *page, size_t len)
 	err = mddev_suspend_and_lock(mddev);
 	if (err)
 		return err;
+	raid5_quiesce(mddev, true);
+
 	conf = mddev->private;
 	if (!conf)
 		err = -ENODEV;
@@ -7198,6 +7200,8 @@ raid5_store_group_thread_cnt(struct mddev *mddev, const char *page, size_t len)
 			kfree(old_groups);
 		}
 	}
+
+	raid5_quiesce(mddev, false);
 	mddev_unlock_and_resume(mddev);
 
 	return err ?: len;