Aksal/nuttx
3
1
Fork 1
mirror of https://github.com/apache/nuttx.git synced 2026-08-27 04:10:40 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 2

Fix another place where sem_tryalloc may be called from the interrupt level. Thanks Manuel

Browse source
This commit is contained in:
Gregory Nutt 2014-06-28 13:32:42 -06:00
parent 7294d8a549
commit d6cf0f5703
1 changed files with 10 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

11
net/iob/iob_alloc_qentry.c
View file

@ -105,7 +105,16 @@ static FAR struct iob_qentry_s *iob_tryalloc_qentry(void)
*/
g_iob_freeqlist = iobq->qe_flink;
DEBUGVERIFY(sem_trywait(&g_qentry_sem));
/* Take a semaphore count. Note that we cannot do this in
* in the orthodox way by calling sem_wait() or sem_trywait()
* because this function may be called from an interrupt
* handler. Fortunately we know at at least one free buffer
* so a simple decrement is all that is needed.
*/
g_qentry_sem.semcount--;
DEBUGASSERT(g_qentry_sem.semcount >= 0);
/* Put the I/O buffer in a known state */