Prevent AudioCommands being freed before read

When AudioCommandThread::threadLoop process AudioCommands it was
possible for it to delete a command where the posting thread still
hadn't read that status from it.

If a second command signaled the thread loop to continue after it
had inserted a new command while the thread loop was actually waiting
for the first command to report that it had read the status the
thread loop would continue and delete the first command.

Changed the wait condition when waiting for the calling thread to
read status to use command->mCond instead of mWaitWorkCV. This way
it's guaranteed that the signal to continue comes from the correct
thread.

Change-Id: Ia69b48cb4fdfaf8b4c83b56a197fb9f2058a92d1

1 files changed, 8 insertions, 6 deletions

diff --git a/services/audioflinger/AudioPolicyService.cpp b/services/audioflinger/AudioPolicyService.cpp
index 8b99bd2..55e0826 100644
--- a/services/audioflinger/AudioPolicyService.cpp
+++ b/services/audioflinger/AudioPolicyService.cpp
@@ -49,6 +49,8 @@ static const char kCmdDeadlockedString[] = "AudioPolicyService command thread ma
 static const int kDumpLockRetries = 50;
 static const int kDumpLockSleepUs = 20000;
 
+static const nsecs_t kAudioCommandTimeout = 3000000000; // 3 seconds
+
 namespace {
     extern struct audio_policy_service_ops aps_ops;
 };
@@ -697,7 +699,7 @@ bool AudioPolicyService::AudioCommandThread::threadLoop()
                                                                     data->mIO);
                     if (command->mWaitStatus) {
                         command->mCond.signal();
-                        mWaitWorkCV.wait(mLock);
+                        command->mCond.waitRelative(mLock, kAudioCommandTimeout);
                     }
                     delete data;
                     }break;
@@ -708,7 +710,7 @@ bool AudioPolicyService::AudioCommandThread::threadLoop()
                     command->mStatus = AudioSystem::setParameters(data->mIO, data->mKeyValuePairs);
                     if (command->mWaitStatus) {
                         command->mCond.signal();
-                        mWaitWorkCV.wait(mLock);
+                        command->mCond.waitRelative(mLock, kAudioCommandTimeout);
                     }
                     delete data;
                     }break;
@@ -719,7 +721,7 @@ bool AudioPolicyService::AudioCommandThread::threadLoop()
                     command->mStatus = AudioSystem::setVoiceVolume(data->mVolume);
                     if (command->mWaitStatus) {
                         command->mCond.signal();
-                        mWaitWorkCV.wait(mLock);
+                        command->mCond.waitRelative(mLock, kAudioCommandTimeout);
                     }
                     delete data;
                     }break;
@@ -827,7 +829,7 @@ status_t AudioPolicyService::AudioCommandThread::volumeCommand(audio_stream_type
     if (command->mWaitStatus) {
         command->mCond.wait(mLock);
         status =  command->mStatus;
-        mWaitWorkCV.signal();
+        command->mCond.signal();
     }
     return status;
 }
@@ -852,7 +854,7 @@ status_t AudioPolicyService::AudioCommandThread::parametersCommand(audio_io_hand
     if (command->mWaitStatus) {
         command->mCond.wait(mLock);
         status =  command->mStatus;
-        mWaitWorkCV.signal();
+        command->mCond.signal();
     }
     return status;
 }
@@ -873,7 +875,7 @@ status_t AudioPolicyService::AudioCommandThread::voiceVolumeCommand(float volume
     if (command->mWaitStatus) {
         command->mCond.wait(mLock);
         status =  command->mStatus;
-        mWaitWorkCV.signal();
+        command->mCond.signal();
     }
     return status;
 }