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

[Niv Yehezkel]

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

Signed-off-by: Niv Yehezkel <executerx@xxxxxxxxx>
---
 drivers/staging/android/sync.c |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/staging/android/sync.c b/drivers/staging/android/sync.c
index 1f88c5d..18174f7 100644
--- a/drivers/staging/android/sync.c
+++ b/drivers/staging/android/sync.c
@@ -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();
 
 	/*
-- 
1.7.10.4

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