audio: fix crashes upon USB device connection

- Audio policy:
Replace unknown device assertion by debug log in setDeviceConnectionState().
It is possible that some kernels indicate connection of a legacy device type
when a USB audio device is connected.
We should just ignore this device.

- Audio flinger:
Make sure FastMixer thread is idle before exiting the normal mixer thread and
closing the output stream.

Change-Id: Ia10a20176a60a8aa56765538093a555fc998508a

1 files changed, 3 insertions, 6 deletions

diff --git a/services/audioflinger/Threads.cpp b/services/audioflinger/Threads.cpp
index 2e2f533..2f65370 100644
--- a/services/audioflinger/Threads.cpp
+++ b/services/audioflinger/Threads.cpp
@@ -2639,12 +2639,9 @@ bool AudioFlinger::PlaybackThread::threadLoop()
 
     threadLoop_exit();
 
-    // for DuplicatingThread, standby mode is handled by the outputTracks, otherwise ...
-    if (mType == MIXER || mType == DIRECT || mType == OFFLOAD) {
-        // put output stream into standby mode
-        if (!mStandby) {
-            mOutput->stream->common.standby(&mOutput->stream->common);
-        }
+    if (!mStandby) {
+        threadLoop_standby();
+        mStandby = true;
     }
 
     releaseWakeLock();