diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 8ea14f41a979fd4e72e3a6093e5fa8d2a0eff24a..9170fd498f460fb52f147b3c1076e1721eb026b5 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -1082,8 +1082,12 @@ static int iommu_bus_notifier(struct notifier_block *nb,
 	 * result in ADD/DEL notifiers to group->notifier
 	 */
 	if (action == BUS_NOTIFY_ADD_DEVICE) {
-		if (ops->add_device)
-			return ops->add_device(dev);
+		if (ops->add_device) {
+			int ret;
+
+			ret = ops->add_device(dev);
+			return (ret) ? NOTIFY_DONE : NOTIFY_OK;
+		}
 	} else if (action == BUS_NOTIFY_REMOVED_DEVICE) {
 		if (ops->remove_device && dev->iommu_group) {
 			ops->remove_device(dev);