From 02de802182b368f1a32373e8f7a2996b13f9ca5c Mon Sep 17 00:00:00 2001
From: Jesse Hall <jessehall@google.com>
Date: Wed, 5 Sep 2012 13:03:10 -0700
Subject: [PATCH] Always reset layer acquireFenceFd after commit

If SurfaceFlinger needs to refresh the screen but the dirty region is
empty, it won't set the layer acquire fences, and stale file
descriptors will be passed to HWC commit(). Now we make sure to clear
the stale file descriptors for each layer right after commit().

Bug: 7078301
Change-Id: I6953ff91fc5488f105b30b07306f9c45a4c3f780
---
 services/surfaceflinger/DisplayHardware/HWComposer.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/services/surfaceflinger/DisplayHardware/HWComposer.cpp b/services/surfaceflinger/DisplayHardware/HWComposer.cpp
index 0034019c8..dca27baa2 100644
--- a/services/surfaceflinger/DisplayHardware/HWComposer.cpp
+++ b/services/surfaceflinger/DisplayHardware/HWComposer.cpp
@@ -599,6 +599,8 @@ public:
             visibleRegion.numRects = 0;
             visibleRegion.rects = NULL;
         }
+
+        getLayer()->acquireFenceFd = -1;
     }
 };