diff --git a/drivers/serial/mxs-auart.c b/drivers/serial/mxs-auart.c
index 0eea46d7197..e5ad794be1d 100644
--- a/drivers/serial/mxs-auart.c
+++ b/drivers/serial/mxs-auart.c
@@ -565,9 +565,33 @@ static irqreturn_t mxs_auart_irq_handle(int irq, void *context)
 		mxs_auart_tx_chars(s);
 		istat &= ~BM_UARTAPP_INTR_TXIS;
 	}
-	if (istat & 0xFFFF)
+	/* modem status interrupt bits are undefined
+	after reset,and the hardware do not support
+	DSRMIS,DCDMIS and RIMIS bit,so we should ingore
+	them when they are pending. */
+	if (istat & (BM_UARTAPP_INTR_ABDIS
+		| BM_UARTAPP_INTR_OEIS
+		| BM_UARTAPP_INTR_BEIS
+		| BM_UARTAPP_INTR_PEIS
+		| BM_UARTAPP_INTR_FEIS
+		| BM_UARTAPP_INTR_RTIS
+		| BM_UARTAPP_INTR_TXIS
+		| BM_UARTAPP_INTR_RXIS
+		| BM_UARTAPP_INTR_CTSMIS)) {
 		dev_info(s->dev, "Unhandled status %x\n", istat);
-	__raw_writel(istatus & 0xFFFF,
+	}
+	__raw_writel(istatus & (BM_UARTAPP_INTR_ABDIS
+		| BM_UARTAPP_INTR_OEIS
+		| BM_UARTAPP_INTR_BEIS
+		| BM_UARTAPP_INTR_PEIS
+		| BM_UARTAPP_INTR_FEIS
+		| BM_UARTAPP_INTR_RTIS
+		| BM_UARTAPP_INTR_TXIS
+		| BM_UARTAPP_INTR_RXIS
+		| BM_UARTAPP_INTR_DSRMIS
+		| BM_UARTAPP_INTR_DCDMIS
+		| BM_UARTAPP_INTR_CTSMIS
+		| BM_UARTAPP_INTR_RIMIS),
 			s->port.membase + HW_UARTAPP_INTR_CLR);
 
 	return IRQ_HANDLED;