diff --git a/drivers/mailbox/omap-mailbox.c b/drivers/mailbox/omap-mailbox.c
index a3cd63583cf732a4f8c2338b0dc03546fe8d92d9..5978a35aac6d092b55ca659fb7e0f76fdfb6dcaf 100644
--- a/drivers/mailbox/omap-mailbox.c
+++ b/drivers/mailbox/omap-mailbox.c
@@ -868,7 +868,7 @@ static int omap_mbox_probe(struct platform_device *pdev)
 	dev_info(mdev->dev, "omap mailbox rev 0x%x\n", l);
 
 	ret = pm_runtime_put_sync(mdev->dev);
-	if (ret < 0)
+	if (ret < 0 && ret != -ENOSYS)
 		goto unregister;
 
 	devm_kfree(&pdev->dev, finfoblk);