tree 81f02206a471c66f969c0b560b75c5683b8ccbd5
parent fec340ea0f82435c8fddeb10cb00b619259d08f2
author Steven Thomas <steventhomas@google.com> 1500325163 -0700
committer Steven Thomas <steventhomas@google.com> 1500329453 -0700

Fix concurrent writes to the hardware composer

Stale hardware composer layers were causing concurrent writes to the
Composer object from the surface flinger and vr flinger threads, a big
no-no. The concurrent writes would sometimes stomp on each other,
causing the hardware composer service to fail to read the command buffer
containing surface flinger's composer commands, leading to all sorts of
issues.

Bug: 62925812

Test: Locally added logs to surface flinger to catch the concurrent
writes, and confirmed the logs are no longer present with this patch
applied. Went through a bunch of sleep/wake cycles and confirmed the
device continues to function normally.

Change-Id: I70929c4a3c71142f5e9083cac294c122d127aa27