Merge "Avoid deadlock on soundtrigger HAL death" into rvc-dev am: 5c5a830c9a

Change-Id: Ie9f2771cd8e942c6751b2fb73e5a06033fa924e4

services/core/java/com/android/server/soundtrigger_middleware/SoundTriggerMiddlewareValidation.java

@@ -783,15 +783,17 @@ public class SoundTriggerMiddlewareValidation implements ISoundTriggerMiddleware
         @Override
         public void onModuleDied() {
             synchronized (SoundTriggerMiddlewareValidation.this) {
-                try {
-                    mState = ModuleStatus.DEAD;
-                    mCallback.onModuleDied();
-                } catch (RemoteException e) {
-                    // Dead client will be handled by binderDied() - no need to handle here.
-                    // In any case, client callbacks are considered best effort.
-                    Log.e(TAG, "Client callback exception.", e);
-                }
+                mState = ModuleStatus.DEAD;
             }
+            // Trigger the callback outside of the lock to avoid deadlocks.
+            try {
+                mCallback.onModuleDied();
+            } catch (RemoteException e) {
+                // Dead client will be handled by binderDied() - no need to handle here.
+                // In any case, client callbacks are considered best effort.
+                Log.e(TAG, "Client callback exception.", e);
+            }
+
         }
 
         @Override

services/core/java/com/android/server/soundtrigger_middleware/SoundTriggerModule.java

@@ -35,8 +35,10 @@ import android.os.RemoteException;
 import android.os.ServiceSpecificException;
 import android.util.Log;
 
+import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.HashSet;
+import java.util.List;
 import java.util.Map;
 import java.util.Set;
 
@@ -166,12 +168,23 @@ class SoundTriggerModule implements IHwBinder.DeathRecipient {
     }
 
     @Override
-    public synchronized void serviceDied(long cookie) {
+    public void serviceDied(long cookie) {
         Log.w(TAG, String.format("Underlying HAL driver died."));
-        for (Session session : mActiveSessions) {
-            session.moduleDied();
+        List<ISoundTriggerCallback> callbacks = new ArrayList<>(mActiveSessions.size());
+        synchronized (this) {
+            for (Session session : mActiveSessions) {
+                callbacks.add(session.moduleDied());
+            }
+            reset();
+        }
+        // Trigger the callbacks outside of the lock to avoid deadlocks.
+        for (ISoundTriggerCallback callback : callbacks) {
+            try {
+                callback.onModuleDied();
+            } catch (RemoteException e) {
+                throw e.rethrowAsRuntimeException();
+            }
         }
-        reset();
     }
 
     /**
@@ -379,15 +392,13 @@ class SoundTriggerModule implements IHwBinder.DeathRecipient {
 
         /**
          * The underlying module HAL is dead.
+         * @return The client callback that needs to be invoked to notify the client.
          */
-        private void moduleDied() {
-            try {
-                mCallback.onModuleDied();
-                removeSession(this);
-                mCallback = null;
-            } catch (RemoteException e) {
-                e.rethrowAsRuntimeException();
-            }
+        private ISoundTriggerCallback moduleDied() {
+            ISoundTriggerCallback callback = mCallback;
+            removeSession(this);
+            mCallback = null;
+            return callback;
         }
 
         private void checkValid() {