surfaceflinger: make vsync injection more robust

am: 6200eacdc9

Change-Id: Ie04e3e56b035ea9e52038de49a2e5c2e67c8abe2

1 files changed, 8 insertions, 0 deletions

diff --git a/services/surfaceflinger/MessageQueue.cpp b/services/surfaceflinger/MessageQueue.cpp
index bca3430794..0b1199c2d0 100644
--- a/services/surfaceflinger/MessageQueue.cpp
+++ b/services/surfaceflinger/MessageQueue.cpp
@@ -91,6 +91,14 @@ void MessageQueue::init(const sp<SurfaceFlinger>& flinger)
 
 void MessageQueue::setEventThread(const sp<EventThread>& eventThread)
 {
+    if (mEventThread == eventThread) {
+        return;
+    }
+
+    if (mEventTube.getFd() >= 0) {
+        mLooper->removeFd(mEventTube.getFd());
+    }
+
     mEventThread = eventThread;
     mEvents = eventThread->createEventConnection();
     mEvents->stealReceiveChannel(&mEventTube);