diff --git a/drivers/tty/serial/m32r_sio.c b/drivers/tty/serial/m32r_sio.c
index bea5c215460..84db7321cce 100644
--- a/drivers/tty/serial/m32r_sio.c
+++ b/drivers/tty/serial/m32r_sio.c
@@ -907,9 +907,10 @@ static int m32r_sio_request_port(struct uart_port *port)
 	return ret;
 }
 
-static void m32r_sio_config_port(struct uart_port *port, int flags)
+static void m32r_sio_config_port(struct uart_port *port, int unused)
 {
 	struct uart_sio_port *up = (struct uart_sio_port *)port;
+	unsigned long flags;
 
 	spin_lock_irqsave(&up->port.lock, flags);