diff --git a/src/com/android/settings/MainClear.java b/src/com/android/settings/MainClear.java
index a7aa8eacf92cb06bda05779712982616e4266f27..ca560cc3429a082511a78a844082303f1901aa77 100644
--- a/src/com/android/settings/MainClear.java
+++ b/src/com/android/settings/MainClear.java
@@ -23,10 +23,12 @@ import android.accounts.AccountManager;
 import android.accounts.AuthenticatorDescription;
 import android.app.ActionBar;
 import android.app.Activity;
+import android.app.AlertDialog;
 import android.app.settings.SettingsEnums;
 import android.content.ComponentName;
 import android.content.ContentResolver;
 import android.content.Context;
+import android.content.DialogInterface;
 import android.content.Intent;
 import android.content.pm.PackageManager;
 import android.content.pm.ResolveInfo;
@@ -39,6 +41,7 @@ import android.os.Environment;
 import android.os.SystemProperties;
 import android.os.UserHandle;
 import android.os.UserManager;
+import android.os.image.DynamicSystemManager;
 import android.provider.Settings;
 import android.sysprop.VoldProperties;
 import android.telephony.euicc.EuiccManager;
@@ -262,6 +265,19 @@ public class MainClear extends InstrumentedFragment implements OnGlobalLayoutLis
                 return;
             }
 
+            final DynamicSystemManager dsuManager = (DynamicSystemManager)
+                    getActivity().getSystemService(Context.DYNAMIC_SYSTEM_SERVICE);
+            if (dsuManager.isInUse()) {
+                AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
+                builder.setTitle(R.string.dsu_is_running);
+                builder.setPositiveButton(R.string.okay, new DialogInterface.OnClickListener() {
+                    public void onClick(DialogInterface dialog, int id) {}
+                });
+                AlertDialog dsuAlertdialog = builder.create();
+                dsuAlertdialog.show();
+                return;
+            }
+
             if (runKeyguardConfirmation(KEYGUARD_REQUEST)) {
                 return;
             }
diff --git a/src/com/android/settings/notification/NotificationAccessConfirmationActivity.java b/src/com/android/settings/notification/NotificationAccessConfirmationActivity.java
index a6b565ae6baaf4aceecf05e7cdd4092743697f52..f01e23a5e8fee359615989dd443d5c9887233c8b 100644
--- a/src/com/android/settings/notification/NotificationAccessConfirmationActivity.java
+++ b/src/com/android/settings/notification/NotificationAccessConfirmationActivity.java
@@ -29,12 +29,14 @@ import android.app.NotificationManager;
 import android.content.ComponentName;
 import android.content.Context;
 import android.content.DialogInterface;
+import android.content.Intent;
 import android.content.pm.ApplicationInfo;
 import android.content.pm.PackageItemInfo;
 import android.content.pm.PackageManager;
-import android.content.pm.ServiceInfo;
+import android.content.pm.ResolveInfo;
 import android.os.Bundle;
 import android.os.UserHandle;
+import android.service.notification.NotificationListenerService;
 import android.text.TextUtils;
 import android.util.Slog;
 import android.view.WindowManager;
@@ -44,6 +46,8 @@ import com.android.internal.app.AlertActivity;
 import com.android.internal.app.AlertController;
 import com.android.settings.R;
 
+import java.util.List;
+
 /** @hide */
 public class NotificationAccessConfirmationActivity extends Activity
         implements DialogInterface {
@@ -92,6 +96,31 @@ public class NotificationAccessConfirmationActivity extends Activity
             return;
         }
 
+        // Check NLS service info.
+        String requiredPermission = Manifest.permission.BIND_NOTIFICATION_LISTENER_SERVICE;
+        Intent NLSIntent = new Intent(NotificationListenerService.SERVICE_INTERFACE);
+        List<ResolveInfo> matchedServiceList = getPackageManager().queryIntentServicesAsUser(
+                NLSIntent, /* flags */ 0, mUserId);
+        boolean hasNLSIntentFilter = false;
+        for (ResolveInfo service : matchedServiceList) {
+            if (service.serviceInfo.packageName.equals(mComponentName.getPackageName())) {
+                if (!requiredPermission.equals(service.serviceInfo.permission)) {
+                    Slog.e(LOG_TAG, "Service " + mComponentName + " lacks permission "
+                            + requiredPermission);
+                    finish();
+                    return;
+                }
+                hasNLSIntentFilter = true;
+                break;
+            }
+        }
+        if (!hasNLSIntentFilter) {
+            Slog.e(LOG_TAG, "Service " + mComponentName + " lacks an intent-filter action "
+                    + "for android.service.notification.NotificationListenerService.");
+            finish();
+            return;
+        }
+
         AlertController.AlertParams p = new AlertController.AlertParams(this);
         p.mTitle = getString(
                 R.string.notification_listener_security_warning_title,
@@ -126,19 +155,6 @@ public class NotificationAccessConfirmationActivity extends Activity
     }
 
     private void onAllow() {
-        String requiredPermission = Manifest.permission.BIND_NOTIFICATION_LISTENER_SERVICE;
-        try {
-            ServiceInfo serviceInfo = getPackageManager().getServiceInfo(mComponentName, 0);
-            if (!requiredPermission.equals(serviceInfo.permission)) {
-                Slog.e(LOG_TAG,
-                        "Service " + mComponentName + " lacks permission " + requiredPermission);
-                return;
-            }
-        } catch (PackageManager.NameNotFoundException e) {
-            Slog.e(LOG_TAG, "Failed to get service info for " + mComponentName, e);
-            return;
-        }
-
         mNm.setNotificationListenerAccessGranted(mComponentName, true);
 
         finish();
@@ -149,12 +165,6 @@ public class NotificationAccessConfirmationActivity extends Activity
         return AlertActivity.dispatchPopulateAccessibilityEvent(this, event);
     }
 
-    @Override
-    public void onBackPressed() {
-        // Suppress finishing the activity on back button press,
-        // consistently with the permission dialog behavior
-    }
-
     @Override
     public void cancel() {
         finish();