diff --git a/drivers/iommu/intel/dmar.c b/drivers/iommu/intel/dmar.c
index 9684c96247f885..7eceee08123526 100644
--- a/drivers/iommu/intel/dmar.c
+++ b/drivers/iommu/intel/dmar.c
@@ -262,7 +262,8 @@ int dmar_insert_dev_scope(struct dmar_pci_notify_info *info,
 						   get_device(dev));
 				return 1;
 			}
-		BUG_ON(i >= devices_cnt);
+		if (WARN_ON(i >= devices_cnt))
+			return -EINVAL;
 	}
 
 	return 0;