diff --git a/drivers/serial/ioc4_serial.c b/drivers/serial/ioc4_serial.c
index 902b067d7e9c..836d9ab4f729 100644
--- a/drivers/serial/ioc4_serial.c
+++ b/drivers/serial/ioc4_serial.c
@@ -2913,17 +2913,27 @@ static int __init ioc4_serial_init(void)
 		printk(KERN_WARNING
 			"%s: Couldn't register rs232 IOC4 serial driver\n",
 			__func__);
-		return ret;
+		goto out;
 	}
 	if ((ret = uart_register_driver(&ioc4_uart_rs422)) < 0) {
 		printk(KERN_WARNING
 			"%s: Couldn't register rs422 IOC4 serial driver\n",
 			__func__);
-		return ret;
+		goto out_uart_rs232;
 	}
 
 	/* register with IOC4 main module */
-	return ioc4_register_submodule(&ioc4_serial_submodule);
+	ret = ioc4_register_submodule(&ioc4_serial_submodule);
+	if (ret)
+		goto out_uart_rs422;
+	return 0;
+
+out_uart_rs422:
+	uart_unregister_driver(&ioc4_uart_rs422);
+out_uart_rs232:
+	uart_unregister_driver(&ioc4_uart_rs232);
+out:
+	return ret;
 }
 
 static void __exit ioc4_serial_exit(void)
diff --git a/drivers/sn/ioc3.c b/drivers/sn/ioc3.c
index 354e9f17e35a..66802a4390cc 100644
--- a/drivers/sn/ioc3.c
+++ b/drivers/sn/ioc3.c
@@ -820,7 +820,7 @@ static int __init ioc3_init(void)
 {
 	if (ia64_platform_is("sn2"))
 		return pci_register_driver(&ioc3_driver);
-	return 0;
+	return -ENODEV;
 }
 
 /* Module unload */