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prevent change serial rx bufsz when serial is opened

This commit is contained in:
Aubr.Cool 2017-01-19 09:55:39 +08:00
parent ea8a622aaf
commit 6fa8bfd92a
1 changed files with 17 additions and 11 deletions
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28
components/drivers/serial/serial.c
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@ -31,6 +31,7 @@
* 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>
@ -603,17 +604,22 @@ static rt_err_t rt_serial_control(struct rt_device *dev,
break;
case RT_DEVICE_CTRL_CONFIG:
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);
}
}
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 = *pconfig;
if(serial->parent.ref_count)
{
/* serial device has been opened, to configure it */
serial->ops->configure(serial, (struct serial_configure *)args);
}
}
break;