From: Prakash Kamliya <pkaml...@codeaurora.org>
There is a race condition
Assume we have *one* sync_fence object, with *one* sync_pt
which belongs to *one* sync_timeline, given this condition,
sync_timeline->kref will have two counts, one for sync_timeline
(implicit) and another for sync_pt.
Assume following is the situation on CPU
Theead-1 : (Thread which calls sync_timeline_destroy())
-> (some function calls)
-> sync_timeline_destory()
-> sync_timeline_signal() (CPU is inside this
function after putting reference to sync_timeline)
At this time Thread-2 comes and does following
Thread-2 : (fclose on fence fd)
> sync_fence_release() -> because of fclose() on fence object
-> sync_fence_free()
-> sync_pt_free()
-> kref_put(&pt->parent->kref, sync_timeline_free);
-> sync_timeline_free() (CPU is inside this because
this time kref will be zero after _put)
Thread-2 will free sync_timeline object before Thread-1
has finished its work inside sync_timeline_signal.
With this change we signals all sync_pt before putting
reference to sync_timeline object.
c: Greg KH <gre...@linuxfoundation.org>
Cc: Colin Cross <ccr...@android.com>
Cc: Android Kernel Team <kernel-t...@android.com>
Signed-off-by: Prakash Kamliya <pkaml...@codeaurora.org>
[jstultz: minor commit subject tweak]
Signed-off-by: John Stultz <john.stu...@linaro.org>
---
drivers/staging/android/sync.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/drivers/staging/android/sync.c b/drivers/staging/android/sync.c
index 38e5d3b..fec2d1c 100644
--- a/drivers/staging/android/sync.c
+++ b/drivers/staging/android/sync.c
@@ -92,14 +92,14 @@ static void sync_timeline_free(struct kref *kref)
void sync_timeline_destroy(struct sync_timeline *obj)
{
obj->destroyed = true;
+ smp_wmb();
/*
- * If this is not the last reference, signal any children
- * that their parent is going away.
+ * signal any children that their parent is going away.
*/
+ sync_timeline_signal(obj);
- if (!kref_put(&obj->kref, sync_timeline_free))
- sync_timeline_signal(obj);
+ kref_put(&obj->kref, sync_timeline_free);
}
EXPORT_SYMBOL(sync_timeline_destroy);
--
1.8.3.2
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