From e25d005d91344c500450f01d4a258ca9c3676627 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 23290e345..113c26ca3 100644
--- a/services/surfaceflinger/DisplayHardware/HWComposer.cpp
+++ b/services/surfaceflinger/DisplayHardware/HWComposer.cpp
@@ -598,6 +598,8 @@ public:
             visibleRegion.numRects = 0;
             visibleRegion.rects = NULL;
         }
+
+        getLayer()->acquireFenceFd = -1;
     }
 };