prevent change serial rx bufsz when serial is opened
* in open function.
* 2015-11-10 bernard fix the poll rx issue when there is no data.
* 2016-05-10 armink add fifo mode to DMA rx when serial->config.bufsz != 0.
+ * 2017-01-19 aubr.cool prevent change serial rx bufsz when serial is opened.
*/
#include <rthw.h>
@@ -605,10 +606,15 @@ static rt_err_t rt_serial_control(struct rt_device *dev,
case RT_DEVICE_CTRL_CONFIG:
if (args)
{
+ struct serial_configure *pconfig = (struct serial_configure *) args;
+ if(pconfig->bufsz != serial->config.bufsz && serial->parent.ref_count)
+ {
+ /*can not change buffer size*/
+ return RT_EBUSY;
+ }
/* set serial configure */
- serial->config = *(struct serial_configure *)args;
-
- if (dev->ref_count)
+ serial->config = *pconfig;
+ if(serial->parent.ref_count)
{
/* serial device has been opened, to configure it */
serial->ops->configure(serial, (struct serial_configure *)args);
