From 99481cd0ac55c52d4023c50175766a18cefa7064 Mon Sep 17 00:00:00 2001
From: Bernard Xiong <bernard.xiong@gmail.com>
Date: Mon, 13 Jun 2016 13:31:13 +0800
Subject: [PATCH] [DeviceDrivers] uart configure issue.

uart configure shall not been performed if uart is not open.
---
 components/drivers/serial/serial.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/components/drivers/serial/serial.c b/components/drivers/serial/serial.c
index 7cb1c6b339..a7f1bcfc08 100644
--- a/components/drivers/serial/serial.c
+++ b/components/drivers/serial/serial.c
@@ -603,8 +603,18 @@ static rt_err_t rt_serial_control(struct rt_device *dev,
             break;
 
         case RT_DEVICE_CTRL_CONFIG:
-            /* configure device */
-            serial->ops->configure(serial, (struct serial_configure *)args);
+			if (args)
+			{
+				/* set serial configure */
+				serial->config = *(struct serial_configure *)args;
+
+				if (dev->ref_count)
+				{
+		            /* serial device has been opened, to configure it */
+		            serial->ops->configure(serial, (struct serial_configure *)args);
+				}
+			}
+			
             break;
 
         default :
-- 
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