diff --git a/[refs] b/[refs]
index 2698123dd4d6..d92e0eeea06c 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 37cd8ed90fc5b11941110d2d0cea6807f86d4787
+refs/heads/master: 951c4df5b7703137bf4eee002d98d083fbc890cc
diff --git a/trunk/drivers/serial/nwpserial.c b/trunk/drivers/serial/nwpserial.c
index 32f3eaf0d262..9e150b19d726 100644
--- a/trunk/drivers/serial/nwpserial.c
+++ b/trunk/drivers/serial/nwpserial.c
@@ -145,11 +145,13 @@ static irqreturn_t nwpserial_interrupt(int irq, void *dev_id)
 		ch = dcr_read(up->dcr_host, UART_RX);
 		if (up->port.ignore_status_mask != NWPSERIAL_STATUS_RXVALID)
 			tty_insert_flip_char(tty, ch, TTY_NORMAL);
-	} while (dcr_read(up->dcr_host, UART_RX) & UART_LSR_DR);
+	} while (dcr_read(up->dcr_host, UART_LSR) & UART_LSR_DR);
 
 	tty_flip_buffer_push(tty);
 	ret = IRQ_HANDLED;
 
+	/* clear interrupt */
+	dcr_write(up->dcr_host, UART_IIR, 1);
 out:
 	spin_unlock(&up->port.lock);
 	return ret;