Bluetooth: prevent enabling BLE in airplane mode

Enabling BLE in airplane mode puts BluetoothManagerService in an
unexpected state which causes Bluetooth to be on when airplane mode
is disabled.

Also fixes a bug where a crash of a BLE client would trigger a restart
into ON mode.

Test: SL4A BleBackgroundScanTest:test_airplane_mode_disables_ble

Bug: 32140251
Bug: 32140271
Bug: 32369494

Change-Id: Ie65157e65c3a1ca914f567a7a0c631175d1e5835
(cherry picked from commit bd93b7b3dc6141cef6236cf0ca7dcc5acf5bfeed)
(cherry picked from commit a80d745c656f1e09aa9331002f613883220ca029)

2 files changed, 13 insertions, 13 deletions

diff --git a/core/java/android/bluetooth/BluetoothAdapter.java b/core/java/android/bluetooth/BluetoothAdapter.java
index 6be5a9725dca..50c8e275ff86 100644
--- a/core/java/android/bluetooth/BluetoothAdapter.java
+++ b/core/java/android/bluetooth/BluetoothAdapter.java
@@ -765,19 +765,13 @@ public final class BluetoothAdapter {
     public boolean enableBLE() {
         if (!isBleScanAlwaysAvailable()) return false;
 
-        if (isLeEnabled() == true) {
-            if (DBG) Log.d(TAG, "enableBLE(): BT is already enabled..!");
-            try {
-                mManagerService.updateBleAppCount(mToken, true);
-            } catch (RemoteException e) {
-                Log.e(TAG, "", e);
-            }
-            return true;
-        }
-
         try {
-            if (DBG) Log.d(TAG, "Calling enableBLE");
             mManagerService.updateBleAppCount(mToken, true);
+            if (isLeEnabled()) {
+                if (DBG) Log.d(TAG, "enableBLE(): Bluetooth already enabled");
+                return true;
+            }
+            if (DBG) Log.d(TAG, "enableBLE(): Calling enable");
             return mManagerService.enable();
         } catch (RemoteException e) {
             Log.e(TAG, "", e);
diff --git a/services/core/java/com/android/server/BluetoothManagerService.java b/services/core/java/com/android/server/BluetoothManagerService.java
index 6757fcce43ce..52be811fad17 100644
--- a/services/core/java/com/android/server/BluetoothManagerService.java
+++ b/services/core/java/com/android/server/BluetoothManagerService.java
@@ -217,6 +217,7 @@ class BluetoothManagerService extends IBluetoothManager.Stub {
                                 mBluetoothLock.readLock().lock();
                                 if (mBluetooth != null) {
                                     mBluetooth.onBrEdrDown();
+                                    mEnable = false;
                                     mEnableExternal = false;
                                 }
                             } catch (RemoteException e) {
@@ -449,14 +450,16 @@ class BluetoothManagerService extends IBluetoothManager.Stub {
 
     class ClientDeathRecipient implements IBinder.DeathRecipient {
         public void binderDied() {
-            if (DBG) Slog.d(TAG, "Binder is dead -  unregister Ble App");
+            if (DBG) Slog.d(TAG, "Binder is dead - unregister Ble App");
             if (mBleAppCount > 0) --mBleAppCount;
 
             if (mBleAppCount == 0) {
                 if (DBG) Slog.d(TAG, "Disabling LE only mode after application crash");
                 try {
                     mBluetoothLock.readLock().lock();
-                    if (mBluetooth != null) {
+                    if (mBluetooth != null &&
+                        mBluetooth.getState() == BluetoothAdapter.STATE_BLE_ON) {
+                        mEnable = false;
                         mBluetooth.onBrEdrDown();
                     }
                 } catch (RemoteException e) {
@@ -473,6 +476,9 @@ class BluetoothManagerService extends IBluetoothManager.Stub {
 
     @Override
     public boolean isBleScanAlwaysAvailable() {
+        if (isAirplaneModeOn() && !mEnable) {
+            return false;
+        }
         try {
             return (Settings.Global.getInt(mContentResolver,
                     Settings.Global.BLE_SCAN_ALWAYS_AVAILABLE)) != 0;