From a7c36ff98ca5ab349a41aaf6efa4403d151106aa Mon Sep 17 00:00:00 2001
From: "bernard.xiong" <bernard.xiong@gmail.com>
Date: Sat, 24 Oct 2009 23:07:55 +0000
Subject: [PATCH] fix rt_serial_read bug when there is no data in the buffer.
 -- found by freescale@stmsky.com

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@129 bbd45198-f89e-11dd-88c7-29a3b14d5316
---
 libcpu/arm/stm32/serial.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libcpu/arm/stm32/serial.c b/libcpu/arm/stm32/serial.c
index 66cd85fe98..7d4795a9ad 100644
--- a/libcpu/arm/stm32/serial.c
+++ b/libcpu/arm/stm32/serial.c
@@ -10,6 +10,8 @@
  * Change Logs:
  * Date           Author       Notes
  * 2009-02-05     Bernard      first version
+ * 2009-10-25     Bernard      fix rt_serial_read bug when there is no data
+ *                             in the buffer.
  */
 
 #include "serial.h"
@@ -198,6 +200,7 @@ static rt_size_t rt_serial_read (rt_device_t dev, rt_off_t pos, void* buffer, rt
 			{
 				/* set error code */
 				err_code = -RT_EEMPTY;
+				break;
 			}
 			else
 			{
-- 
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