diff --git a/drivers/tty/serial/nwpserial.c b/drivers/tty/serial/nwpserial.c
index 77287c54f331682425403e045b0548c7f460590c..549c70a2a63e8397521b63fd6120e7dad9cfb079 100644
--- a/drivers/tty/serial/nwpserial.c
+++ b/drivers/tty/serial/nwpserial.c
@@ -199,7 +199,7 @@ static void nwpserial_shutdown(struct uart_port *port)
 	dcr_write(up->dcr_host, UART_IER, up->ier);
 
 	/* free irq */
-	free_irq(up->port.irq, port);
+	free_irq(up->port.irq, up);
 }
 
 static int nwpserial_verify_port(struct uart_port *port,