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sched/semaphore: Always free mutex holder at nxsem_post

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There is no need to check the holder structure "counts". There are cases
where the counts may be greater than 1 when several tasks block
on the mutex, but there is always just one holder, which must be freed.

Signed-off-by: Jukka Laitinen <jukka.laitinen@tii.ae>
This commit is contained in:
Jukka Laitinen
2025-05-21 19:33:04 +03:00
committed by Xiang Xiao
parent f3231a1934
commit b2315e98c4
1 changed files with 6 additions and 2 deletions
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sched/semaphore/sem_holder.c
+6 -2
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@@ -240,9 +240,11 @@ static int nxsem_freecount0holder(FAR struct semholder_s *pholder,
{ {
/* When no more counts are held, remove the holder from the list. The /* When no more counts are held, remove the holder from the list. The
* count was decremented in nxsem_release_holder. * count was decremented in nxsem_release_holder.
*
* Mutex is held only by one thread, so the holder is always freed.
*/ */
if (pholder->counts <= 0) if (pholder->counts <= 0 || NXSEM_IS_MUTEX(sem))
{ {
nxsem_freeholder(sem, pholder); nxsem_freeholder(sem, pholder);
return 1; return 1;
@@ -442,9 +444,11 @@ static int nxsem_restoreholderprio(FAR struct semholder_s *pholder,
/* Release the holder if all counts have been given up /* Release the holder if all counts have been given up
* before reprioritizing causes a context switch. * before reprioritizing causes a context switch.
*
* Mutex is held only by one thread, so the holder is always freed.
*/ */
if (pholder->counts <= 0) if (pholder->counts <= 0 || NXSEM_IS_MUTEX(sem))
{ {
nxsem_freeholder(sem, pholder); nxsem_freeholder(sem, pholder);
} }