Make LockoutResetCallback oneway

Test: Get locked out, make sure wake-and-unlock is working
again after 30 seconds.

Change-Id: I2fb03775898c0567f058d6d9d0b963ed071cc786
Fixes: 32946531

core/java/android/hardware/fingerprint/FingerprintManager.java

@@ -26,6 +26,7 @@ import android.os.CancellationSignal;
 import android.os.CancellationSignal.OnCancelListener;
 import android.os.Handler;
 import android.os.IBinder;
+import android.os.IRemoteCallback;
 import android.os.Looper;
 import android.os.PowerManager;
 import android.os.RemoteException;
@@ -757,20 +758,22 @@ public class FingerprintManager {
                         new IFingerprintServiceLockoutResetCallback.Stub() {
 
                     @Override
-                    public void onLockoutReset(long deviceId) throws RemoteException {
-                        final PowerManager.WakeLock wakeLock = powerManager.newWakeLock(
-                                PowerManager.PARTIAL_WAKE_LOCK, "lockoutResetCallback");
-                        wakeLock.acquire();
-                        mHandler.post(new Runnable() {
-                            @Override
-                            public void run() {
+                    public void onLockoutReset(long deviceId, IRemoteCallback serverCallback)
+                            throws RemoteException {
+                        try {
+                            final PowerManager.WakeLock wakeLock = powerManager.newWakeLock(
+                                    PowerManager.PARTIAL_WAKE_LOCK, "lockoutResetCallback");
+                            wakeLock.acquire();
+                            mHandler.post(() -> {
                                 try {
                                     callback.onLockoutReset();
                                 } finally {
                                     wakeLock.release();
                                 }
-                            }
-                        });
+                            });
+                        } finally {
+                            serverCallback.sendResult(null /* data */);
+                        }
                     }
                 });
             } catch (RemoteException e) {

core/java/android/hardware/fingerprint/IFingerprintServiceLockoutResetCallback.aidl

@@ -17,14 +17,17 @@ package android.hardware.fingerprint;
 
 import android.hardware.fingerprint.Fingerprint;
 import android.os.Bundle;
+import android.os.IRemoteCallback;
 import android.os.UserHandle;
 
 /**
  * Callback when lockout period expired and clients are allowed to authenticate again.
  * @hide
  */
-interface IFingerprintServiceLockoutResetCallback {
+oneway interface IFingerprintServiceLockoutResetCallback {
 
-    /** Method is synchronous so wakelock is held when this is called from a WAKEUP alarm. */
-    void onLockoutReset(long deviceId);
+    /**
+     * A wakelock will be held until the reciever calls back into {@param callback}
+     */
+    void onLockoutReset(long deviceId, IRemoteCallback callback);
 }

services/core/java/com/android/server/fingerprint/FingerprintService.java

@@ -32,11 +32,14 @@ import android.content.pm.PackageManager;
 import android.content.pm.UserInfo;
 import android.hardware.fingerprint.IFingerprintServiceLockoutResetCallback;
 import android.os.Binder;
+import android.os.Bundle;
 import android.os.DeadObjectException;
 import android.os.Environment;
 import android.os.Handler;
 import android.os.IBinder;
+import android.os.IRemoteCallback;
 import android.os.PowerManager;
+import android.os.PowerManager.WakeLock;
 import android.os.RemoteException;
 import android.os.SELinux;
 import android.os.ServiceManager;
@@ -625,17 +628,28 @@ public class FingerprintService extends SystemService implements IBinder.DeathRe
 
     private class FingerprintServiceLockoutResetMonitor {
 
+        private static final long WAKELOCK_TIMEOUT_MS = 2000;
         private final IFingerprintServiceLockoutResetCallback mCallback;
+        private final WakeLock mWakeLock;
 
         public FingerprintServiceLockoutResetMonitor(
                 IFingerprintServiceLockoutResetCallback callback) {
             mCallback = callback;
+            mWakeLock = mPowerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK,
+                    "lockout reset callback");
         }
 
         public void sendLockoutReset() {
             if (mCallback != null) {
                 try {
-                    mCallback.onLockoutReset(mHalDeviceId);
+                    mWakeLock.acquire(WAKELOCK_TIMEOUT_MS);
+                    mCallback.onLockoutReset(mHalDeviceId, new IRemoteCallback.Stub() {
+
+                        @Override
+                        public void sendResult(Bundle data) throws RemoteException {
+                            mWakeLock.release();
+                        }
+                    });
                 } catch (DeadObjectException e) {
                     Slog.w(TAG, "Death object while invoking onLockoutReset: ", e);
                     mHandler.post(mRemoveCallbackRunnable);
@@ -648,6 +662,9 @@ public class FingerprintService extends SystemService implements IBinder.DeathRe
         private final Runnable mRemoveCallbackRunnable = new Runnable() {
             @Override
             public void run() {
+                if (mWakeLock.isHeld()) {
+                    mWakeLock.release();
+                }
                 removeLockoutResetCallback(FingerprintServiceLockoutResetMonitor.this);
             }
         };