diff --git a/drivers/iommu/iommu-debug.c b/drivers/iommu/iommu-debug.c
index f4994c041b8b..c7491992ec90 100644
--- a/drivers/iommu/iommu-debug.c
+++ b/drivers/iommu/iommu-debug.c
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0-only
 /*
- * Copyright (c) 2015-2019, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2015-2020, The Linux Foundation. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 and
@@ -2023,7 +2023,7 @@ out:
 
 invalid_format:
 	pr_err_ratelimited("Invalid format. Expected: iova,len, dma attr\n");
-	return retval;
+	return -EINVAL;
 }
 
 static const struct file_operations iommu_debug_dma_unmap_fops = {