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device: only increase the ref_count when device is truly opened

This commit is contained in:
Grissiom 2014-06-18 11:16:21 +08:00
parent 1dc376b2f4
commit dc366ecf7a
1 changed files with 7 additions and 5 deletions
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12
src/device.c
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@ -239,11 +239,6 @@ rt_err_t rt_device_open(rt_device_t dev, rt_uint16_t oflag)
return -RT_EBUSY;
}
dev->ref_count++;
/* don't let bad things happen silently. If you are bitten by this assert,
* please set the ref_count to a bigger type. */
RT_ASSERT(dev->ref_count != 0);
/* call device open interface */
if (dev->open != RT_NULL)
{
@ -252,8 +247,15 @@ rt_err_t rt_device_open(rt_device_t dev, rt_uint16_t oflag)
/* set open flag */
if (result == RT_EOK || result == -RT_ENOSYS)
{
dev->open_flag = oflag | RT_DEVICE_OFLAG_OPEN;
dev->ref_count++;
/* don't let bad things happen silently. If you are bitten by this assert,
* please set the ref_count to a bigger type. */
RT_ASSERT(dev->ref_count != 0);
}
return result;
}
RTM_EXPORT(rt_device_open);