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staging: android: describe use of memory barrier on sync.c

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Added comments describing the purpose of using write memory
barrier in the context of sync_timeline_destory.

Signed-off-by: Niv Yehezkel <executerx@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Niv Yehezkel 2014-05-24 10:28:07 -04:00 committed by Greg Kroah-Hartman
parent 77870a1b85
commit 296066093b
1 changed files with 4 additions and 0 deletions
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drivers/staging/android/sync.c
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@ -92,6 +92,10 @@ static void sync_timeline_free(struct kref *kref)
void sync_timeline_destroy(struct sync_timeline *obj)
{
obj->destroyed = true;
/*
* Ensure timeline is marked as destroyed before
* changing timeline's fences status.
*/
smp_wmb();
/*