Synchronize adapter registration with mCallbacks

Move register/unregister callback to the caller thread.
This fixes a problem that if an app registers adapter while the
BluetoothManagerService is turning on Bluetooth, the app would
get a null IBluetooth and would not receive any callback after
Bluetooth is turned on.

Bug: 149890859
Test: Manual
Change-Id: Ia79f6bd1fd6ffab814a15053aeaae031faf875dd

1 files changed, 30 insertions, 40 deletions

diff --git a/services/core/java/com/android/server/BluetoothManagerService.java b/services/core/java/com/android/server/BluetoothManagerService.java
index 168c8cd713b6..ebaebae63067 100644
--- a/services/core/java/com/android/server/BluetoothManagerService.java
+++ b/services/core/java/com/android/server/BluetoothManagerService.java
@@ -113,8 +113,6 @@ class BluetoothManagerService extends IBluetoothManager.Stub {
     private static final int MESSAGE_DISABLE = 2;
     private static final int MESSAGE_HANDLE_ENABLE_DELAYED = 3;
     private static final int MESSAGE_HANDLE_DISABLE_DELAYED = 4;
-    private static final int MESSAGE_REGISTER_ADAPTER = 20;
-    private static final int MESSAGE_UNREGISTER_ADAPTER = 21;
     private static final int MESSAGE_REGISTER_STATE_CHANGE_CALLBACK = 30;
     private static final int MESSAGE_UNREGISTER_STATE_CHANGE_CALLBACK = 31;
     private static final int MESSAGE_BLUETOOTH_SERVICE_CONNECTED = 40;
@@ -590,10 +588,9 @@ class BluetoothManagerService extends IBluetoothManager.Stub {
             Slog.w(TAG, "Callback is null in registerAdapter");
             return null;
         }
-        Message msg = mHandler.obtainMessage(MESSAGE_REGISTER_ADAPTER);
-        msg.obj = callback;
-        mHandler.sendMessage(msg);
-
+        synchronized (mCallbacks) {
+            mCallbacks.register(callback);
+        }
         return mBluetooth;
     }
 
@@ -603,9 +600,9 @@ class BluetoothManagerService extends IBluetoothManager.Stub {
             return;
         }
         mContext.enforceCallingOrSelfPermission(BLUETOOTH_PERM, "Need BLUETOOTH permission");
-        Message msg = mHandler.obtainMessage(MESSAGE_UNREGISTER_ADAPTER);
-        msg.obj = callback;
-        mHandler.sendMessage(msg);
+        synchronized (mCallbacks) {
+            mCallbacks.unregister(callback);
+        }
     }
 
     public void registerStateChangeCallback(IBluetoothStateChangeCallback callback) {
@@ -1478,18 +1475,20 @@ class BluetoothManagerService extends IBluetoothManager.Stub {
      * Inform BluetoothAdapter instances that Adapter service is up
      */
     private void sendBluetoothServiceUpCallback() {
-        try {
-            int n = mCallbacks.beginBroadcast();
-            Slog.d(TAG, "Broadcasting onBluetoothServiceUp() to " + n + " receivers.");
-            for (int i = 0; i < n; i++) {
-                try {
-                    mCallbacks.getBroadcastItem(i).onBluetoothServiceUp(mBluetooth);
-                } catch (RemoteException e) {
-                    Slog.e(TAG, "Unable to call onBluetoothServiceUp() on callback #" + i, e);
+        synchronized (mCallbacks) {
+            try {
+                int n = mCallbacks.beginBroadcast();
+                Slog.d(TAG, "Broadcasting onBluetoothServiceUp() to " + n + " receivers.");
+                for (int i = 0; i < n; i++) {
+                    try {
+                        mCallbacks.getBroadcastItem(i).onBluetoothServiceUp(mBluetooth);
+                    } catch (RemoteException e) {
+                        Slog.e(TAG, "Unable to call onBluetoothServiceUp() on callback #" + i, e);
+                    }
                 }
+            } finally {
+                mCallbacks.finishBroadcast();
             }
-        } finally {
-            mCallbacks.finishBroadcast();
         }
     }
 
@@ -1497,18 +1496,20 @@ class BluetoothManagerService extends IBluetoothManager.Stub {
      * Inform BluetoothAdapter instances that Adapter service is down
      */
     private void sendBluetoothServiceDownCallback() {
-        try {
-            int n = mCallbacks.beginBroadcast();
-            Slog.d(TAG, "Broadcasting onBluetoothServiceDown() to " + n + " receivers.");
-            for (int i = 0; i < n; i++) {
-                try {
-                    mCallbacks.getBroadcastItem(i).onBluetoothServiceDown();
-                } catch (RemoteException e) {
-                    Slog.e(TAG, "Unable to call onBluetoothServiceDown() on callback #" + i, e);
+        synchronized (mCallbacks) {
+            try {
+                int n = mCallbacks.beginBroadcast();
+                Slog.d(TAG, "Broadcasting onBluetoothServiceDown() to " + n + " receivers.");
+                for (int i = 0; i < n; i++) {
+                    try {
+                        mCallbacks.getBroadcastItem(i).onBluetoothServiceDown();
+                    } catch (RemoteException e) {
+                        Slog.e(TAG, "Unable to call onBluetoothServiceDown() on callback #" + i, e);
+                    }
                 }
+            } finally {
+                mCallbacks.finishBroadcast();
             }
-        } finally {
-            mCallbacks.finishBroadcast();
         }
     }
 
@@ -1836,17 +1837,6 @@ class BluetoothManagerService extends IBluetoothManager.Stub {
                                 mContext.getPackageName());
                     }
                     break;
-
-                case MESSAGE_REGISTER_ADAPTER: {
-                    IBluetoothManagerCallback callback = (IBluetoothManagerCallback) msg.obj;
-                    mCallbacks.register(callback);
-                    break;
-                }
-                case MESSAGE_UNREGISTER_ADAPTER: {
-                    IBluetoothManagerCallback callback = (IBluetoothManagerCallback) msg.obj;
-                    mCallbacks.unregister(callback);
-                    break;
-                }
                 case MESSAGE_REGISTER_STATE_CHANGE_CALLBACK: {
                     IBluetoothStateChangeCallback callback =
                             (IBluetoothStateChangeCallback) msg.obj;