From c61de17f143b5f806c5bab9cc58910a322302b70 Mon Sep 17 00:00:00 2001
From: Mathias Agopian <mathias@google.com>
Date: Mon, 30 Nov 2009 11:15:41 -0800
Subject: [PATCH] fixed [2260070] display stopped updating

always check that the visible region isn't empty after all visible regions are recomputed
clear he freeze-lock if it is.
---
 libs/surfaceflinger/Layer.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libs/surfaceflinger/Layer.cpp b/libs/surfaceflinger/Layer.cpp
index f5a5a0bf2..f11bf1846 100644
--- a/libs/surfaceflinger/Layer.cpp
+++ b/libs/surfaceflinger/Layer.cpp
@@ -515,6 +515,11 @@ void Layer::unlockPageFlip(
         dirtyRegion.andSelf(visibleRegionScreen);
         outDirtyRegion.orSelf(dirtyRegion);
     }
+    if (visibleRegionScreen.isEmpty()) {
+        // an invisible layer should not hold a freeze-lock
+        // (because it may never be updated and thereore never release it)
+        mFreezeLock.clear();
+    }
 }
 
 void Layer::finishPageFlip()