diff --git a/drivers/tty/serial/pch_uart.c b/drivers/tty/serial/pch_uart.c
index 110595e..32ac7ea 100644
--- a/drivers/tty/serial/pch_uart.c
+++ b/drivers/tty/serial/pch_uart.c
@@ -552,14 +552,10 @@
 	return i;
 }
 
-static unsigned int pch_uart_hal_get_iid(struct eg20t_port *priv)
+static unsigned char pch_uart_hal_get_iid(struct eg20t_port *priv)
 {
-	unsigned int iir;
-	int ret;
-
-	iir = ioread8(priv->membase + UART_IIR);
-	ret = (iir & (PCH_UART_IIR_IID | PCH_UART_IIR_TOI | PCH_UART_IIR_IP));
-	return ret;
+	return ioread8(priv->membase + UART_IIR) &\
+		      (PCH_UART_IIR_IID | PCH_UART_IIR_TOI | PCH_UART_IIR_IP);
 }
 
 static u8 pch_uart_hal_get_line_status(struct eg20t_port *priv)
@@ -1045,7 +1041,7 @@
 	unsigned int handled;
 	u8 lsr;
 	int ret = 0;
-	unsigned int iid;
+	unsigned char iid;
 	unsigned long flags;
 
 	spin_lock_irqsave(&priv->port.lock, flags);