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serial: set the errno if and only if in thread context 

The errno is associated with threads. It will crash the thread if we set
it in interrupt context.
This commit is contained in:
Grissiom 2013-10-25 20:31:02 +08:00
parent 21fb9a0bac
commit 07bd09fc0f
1 changed files with 4 additions and 3 deletions
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7
components/drivers/serial/serial.c
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@ -257,8 +257,8 @@ static rt_size_t rt_serial_read(struct rt_device *dev,
} }
read_nbytes = (rt_uint32_t)ptr - (rt_uint32_t)buffer; read_nbytes = (rt_uint32_t)ptr - (rt_uint32_t)buffer;
/* set error code */ /* set error code if and only if in thread context */
if (read_nbytes == 0) if (read_nbytes == 0 && !rt_interrupt_get_nest())
{ {
rt_set_errno(-RT_EEMPTY); rt_set_errno(-RT_EEMPTY);
} }
@ -349,7 +349,8 @@ static rt_size_t rt_serial_write(struct rt_device *dev,
} }
write_nbytes = (rt_uint32_t)ptr - (rt_uint32_t)buffer; write_nbytes = (rt_uint32_t)ptr - (rt_uint32_t)buffer;
if (write_nbytes == 0) /* set error code if and only if in thread context */
if (write_nbytes == 0 && !rt_interrupt_get_nest())
{ {
rt_set_errno(-RT_EFULL); rt_set_errno(-RT_EFULL);
} }