diff --git a/Tethering/common/TetheringLib/src/android/net/ITetheringEventCallback.aidl b/Tethering/common/TetheringLib/src/android/net/ITetheringEventCallback.aidl
index 836761f..b4e3ba4 100644
--- a/Tethering/common/TetheringLib/src/android/net/ITetheringEventCallback.aidl
+++ b/Tethering/common/TetheringLib/src/android/net/ITetheringEventCallback.aidl
@@ -36,5 +36,4 @@
     void onTetherStatesChanged(in TetherStatesParcel states);
     void onTetherClientsChanged(in List<TetheredClient> clients);
     void onOffloadStatusChanged(int status);
-    void onSupportedTetheringTypes(long supportedBitmap);
 }
diff --git a/Tethering/common/TetheringLib/src/android/net/TetheringCallbackStartedParcel.aidl b/Tethering/common/TetheringLib/src/android/net/TetheringCallbackStartedParcel.aidl
index f33f846..253eacb 100644
--- a/Tethering/common/TetheringLib/src/android/net/TetheringCallbackStartedParcel.aidl
+++ b/Tethering/common/TetheringLib/src/android/net/TetheringCallbackStartedParcel.aidl
@@ -26,7 +26,7 @@
  * @hide
  */
 parcelable TetheringCallbackStartedParcel {
-    long supportedTypes;
+    boolean tetheringSupported;
     Network upstreamNetwork;
     TetheringConfigurationParcel config;
     TetherStatesParcel states;
diff --git a/Tethering/common/TetheringLib/src/android/net/TetheringManager.java b/Tethering/common/TetheringLib/src/android/net/TetheringManager.java
index b3f0cf2..6f9b33e 100644
--- a/Tethering/common/TetheringLib/src/android/net/TetheringManager.java
+++ b/Tethering/common/TetheringLib/src/android/net/TetheringManager.java
@@ -183,12 +183,6 @@
      */
     public static final int TETHERING_WIGIG = 6;
 
-    /**
-     * The int value of last tethering type.
-     * @hide
-     */
-    public static final int MAX_TETHERING_TYPE = TETHERING_WIGIG;
-
     /** @hide */
     @Retention(RetentionPolicy.SOURCE)
     @IntDef(value = {
@@ -526,9 +520,6 @@
         }
 
         @Override
-        public void onSupportedTetheringTypes(long supportedBitmap) { }
-
-        @Override
         public void onUpstreamChanged(Network network) { }
 
         @Override
@@ -1042,29 +1033,15 @@
         /**
          * Called when tethering supported status changed.
          *
-         * <p>This callback will be called immediately after the callback is
-         * registered, and never be called if there is changes afterward.
-         *
-         * <p>Tethering may be disabled via system properties, device configuration, or device
-         * policy restrictions.
-         *
-         * @param supported whether any tethering type is supported.
-         */
-        default void onTetheringSupported(boolean supported) {}
-
-        /**
-         * Called when tethering supported status changed.
-         *
          * <p>This will be called immediately after the callback is registered, and may be called
          * multiple times later upon changes.
          *
          * <p>Tethering may be disabled via system properties, device configuration, or device
          * policy restrictions.
          *
-         * @param supportedTypes a set of @TetheringType which is supported.
-         * @hide
+         * @param supported The new supported status
          */
-        default void onSupportedTetheringTypes(@NonNull Set<Integer> supportedTypes) {}
+        default void onTetheringSupported(boolean supported) {}
 
         /**
          * Called when tethering upstream changed.
@@ -1362,8 +1339,7 @@
                 @Override
                 public void onCallbackStarted(TetheringCallbackStartedParcel parcel) {
                     executor.execute(() -> {
-                        callback.onSupportedTetheringTypes(unpackBits(parcel.supportedTypes));
-                        callback.onTetheringSupported(parcel.supportedTypes != 0);
+                        callback.onTetheringSupported(parcel.tetheringSupported);
                         callback.onUpstreamChanged(parcel.upstreamNetwork);
                         sendErrorCallbacks(parcel.states);
                         sendRegexpsChanged(parcel.config);
@@ -1382,13 +1358,6 @@
                     });
                 }
 
-                @Override
-                public void onSupportedTetheringTypes(long supportedBitmap) {
-                    executor.execute(() -> {
-                        callback.onSupportedTetheringTypes(unpackBits(supportedBitmap));
-                    });
-                }
-
                 private void sendRegexpsChanged(TetheringConfigurationParcel parcel) {
                     callback.onTetherableInterfaceRegexpsChanged(new TetheringInterfaceRegexps(
                             parcel.tetherableBluetoothRegexs,
@@ -1427,23 +1396,6 @@
     }
 
     /**
-     * Unpack bitmap to a set of bit position intergers.
-     * @hide
-     */
-    public static ArraySet<Integer> unpackBits(long val) {
-        final ArraySet<Integer> result = new ArraySet<>(Long.bitCount(val));
-        int bitPos = 0;
-        while (val != 0) {
-            if ((val & 1) == 1) result.add(bitPos);
-
-            val = val >>> 1;
-            bitPos++;
-        }
-
-        return result;
-    }
-
-    /**
      * Remove tethering event callback previously registered with
      * {@link #registerTetheringEventCallback}.
      *
diff --git a/Tethering/src/com/android/networkstack/tethering/Tethering.java b/Tethering/src/com/android/networkstack/tethering/Tethering.java
index 47b1bd7..3f328db 100644
--- a/Tethering/src/com/android/networkstack/tethering/Tethering.java
+++ b/Tethering/src/com/android/networkstack/tethering/Tethering.java
@@ -281,11 +281,6 @@
     private BluetoothPan mBluetoothPan;
     private PanServiceListener mBluetoothPanListener;
     private ArrayList<Pair<Boolean, IIntResultListener>> mPendingPanRequests;
-    // AIDL doesn't support Set<Integer>. Maintain a int bitmap here. When the bitmap is passed to
-    // TetheringManager, TetheringManager would convert it to a set of Integer types.
-    // mSupportedTypeBitmap should always be updated inside tethering internal thread but it may be
-    // read from binder thread which called TetheringService directly.
-    private volatile long mSupportedTypeBitmap;
 
     public Tethering(TetheringDependencies deps) {
         mLog.mark("Tethering.constructed");
@@ -517,8 +512,6 @@
         mUpstreamNetworkMonitor.setUpstreamConfig(mConfig.chooseUpstreamAutomatically,
                 mConfig.isDunRequired);
         reportConfigurationChanged(mConfig.toStableParcelable());
-
-        updateSupportedDownstreams(mConfig);
     }
 
     private void maybeDunSettingChanged() {
@@ -1557,6 +1550,26 @@
         return mConfig;
     }
 
+    boolean hasAnySupportedDownstream() {
+        if ((mConfig.tetherableUsbRegexs.length != 0)
+                || (mConfig.tetherableWifiRegexs.length != 0)
+                || (mConfig.tetherableBluetoothRegexs.length != 0)) {
+            return true;
+        }
+
+        // Before T, isTetheringSupported would return true if wifi, usb and bluetooth tethering are
+        // disabled (whole tethering settings would be hidden). This means tethering would also not
+        // support wifi p2p, ethernet tethering and mirrorlink. This is wrong but probably there are
+        // some devices in the field rely on this to disable tethering entirely.
+        if (!SdkLevel.isAtLeastT()) return false;
+
+        return (mConfig.tetherableWifiP2pRegexs.length != 0)
+                || (mConfig.tetherableNcmRegexs.length != 0)
+                || isEthernetSupported();
+    }
+
+    // TODO: using EtherentManager new API to check whether ethernet is supported when the API is
+    // ready to use.
     private boolean isEthernetSupported() {
         return mContext.getSystemService(Context.ETHERNET_SERVICE) != null;
     }
@@ -2346,7 +2359,7 @@
         mHandler.post(() -> {
             mTetheringEventCallbacks.register(callback, new CallbackCookie(hasListPermission));
             final TetheringCallbackStartedParcel parcel = new TetheringCallbackStartedParcel();
-            parcel.supportedTypes = mSupportedTypeBitmap;
+            parcel.tetheringSupported = isTetheringSupported();
             parcel.upstreamNetwork = mTetherUpstream;
             parcel.config = mConfig.toStableParcelable();
             parcel.states =
@@ -2385,22 +2398,6 @@
         });
     }
 
-    private void reportTetheringSupportedChange(final long supportedBitmap) {
-        final int length = mTetheringEventCallbacks.beginBroadcast();
-        try {
-            for (int i = 0; i < length; i++) {
-                try {
-                    mTetheringEventCallbacks.getBroadcastItem(i).onSupportedTetheringTypes(
-                            supportedBitmap);
-                } catch (RemoteException e) {
-                    // Not really very much to do here.
-                }
-            }
-        } finally {
-            mTetheringEventCallbacks.finishBroadcast();
-        }
-    }
-
     private void reportUpstreamChanged(UpstreamNetworkState ns) {
         final int length = mTetheringEventCallbacks.beginBroadcast();
         final Network network = (ns != null) ? ns.network : null;
@@ -2485,56 +2482,18 @@
         }
     }
 
-    private void updateSupportedDownstreams(final TetheringConfiguration config) {
-        final long preSupportedBitmap = mSupportedTypeBitmap;
-
-        if (!isTetheringAllowed() || mEntitlementMgr.isProvisioningNeededButUnavailable()) {
-            mSupportedTypeBitmap = 0;
-        } else {
-            mSupportedTypeBitmap = makeSupportedDownstreams(config);
-        }
-
-        if (preSupportedBitmap != mSupportedTypeBitmap) {
-            reportTetheringSupportedChange(mSupportedTypeBitmap);
-        }
-    }
-
-    private long makeSupportedDownstreams(final TetheringConfiguration config) {
-        long types = 0;
-        if (config.tetherableUsbRegexs.length != 0) types |= (1 << TETHERING_USB);
-
-        if (config.tetherableWifiRegexs.length != 0) types |= (1 << TETHERING_WIFI);
-
-        if (config.tetherableBluetoothRegexs.length != 0) types |= (1 << TETHERING_BLUETOOTH);
-
-        // Before T, isTetheringSupported would return true if wifi, usb and bluetooth tethering are
-        // disabled (whole tethering settings would be hidden). This means tethering would also not
-        // support wifi p2p, ethernet tethering and mirrorlink. This is wrong but probably there are
-        // some devices in the field rely on this to disable tethering entirely.
-        if (!SdkLevel.isAtLeastT() && types == 0) return types;
-
-        if (config.tetherableNcmRegexs.length != 0) types |= (1 << TETHERING_NCM);
-
-        if (config.tetherableWifiP2pRegexs.length != 0) types |= (1 << TETHERING_WIFI_P2P);
-
-        if (isEthernetSupported()) types |= (1 << TETHERING_ETHERNET);
-
-        return types;
-    }
-
     // if ro.tether.denied = true we default to no tethering
     // gservices could set the secure setting to 1 though to enable it on a build where it
     // had previously been turned off.
-    private boolean isTetheringAllowed() {
+    boolean isTetheringSupported() {
         final int defaultVal = mDeps.isTetheringDenied() ? 0 : 1;
         final boolean tetherSupported = Settings.Global.getInt(mContext.getContentResolver(),
                 Settings.Global.TETHER_SUPPORTED, defaultVal) != 0;
-        return tetherSupported
+        final boolean tetherEnabledInSettings = tetherSupported
                 && !mUserManager.hasUserRestriction(UserManager.DISALLOW_CONFIG_TETHERING);
-    }
 
-    boolean isTetheringSupported() {
-        return mSupportedTypeBitmap > 0;
+        return tetherEnabledInSettings && hasAnySupportedDownstream()
+                && !mEntitlementMgr.isProvisioningNeededButUnavailable();
     }
 
     private void dumpBpf(IndentingPrintWriter pw) {
diff --git a/Tethering/tests/integration/src/android/net/EthernetTetheringTest.java b/Tethering/tests/integration/src/android/net/EthernetTetheringTest.java
index ef4f052..86dca1c 100644
--- a/Tethering/tests/integration/src/android/net/EthernetTetheringTest.java
+++ b/Tethering/tests/integration/src/android/net/EthernetTetheringTest.java
@@ -192,13 +192,12 @@
         mUiAutomation.adoptShellPermissionIdentity(
                 MANAGE_TEST_NETWORKS, NETWORK_SETTINGS, TETHER_PRIVILEGED, ACCESS_NETWORK_STATE,
                 CONNECTIVITY_USE_RESTRICTED_NETWORKS, DUMP);
+        mRunTests = mTm.isTetheringSupported() && mEm != null;
+        assumeTrue(mRunTests);
+
         mHandlerThread = new HandlerThread(getClass().getSimpleName());
         mHandlerThread.start();
         mHandler = new Handler(mHandlerThread.getLooper());
-
-        mRunTests = isEthernetTetheringSupported();
-        assumeTrue(mRunTests);
-
         mTetheredInterfaceRequester = new TetheredInterfaceRequester(mHandler, mEm);
     }
 
@@ -226,6 +225,7 @@
             mHandler.post(() -> reader.stop());
             mDownstreamReader = null;
         }
+        mHandlerThread.quitSafely();
         mTetheredInterfaceRequester.release();
         mEm.setIncludeTestInterfaces(false);
         maybeDeleteTestInterface();
@@ -236,7 +236,6 @@
         try {
             if (mRunTests) cleanUp();
         } finally {
-            mHandlerThread.quitSafely();
             mUiAutomation.dropShellPermissionIdentity();
         }
     }
@@ -411,23 +410,6 @@
         // client, which is not possible in this test.
     }
 
-    private boolean isEthernetTetheringSupported() throws Exception {
-        final CompletableFuture<Boolean> future = new CompletableFuture<>();
-        final TetheringEventCallback callback = new TetheringEventCallback() {
-            @Override
-            public void onSupportedTetheringTypes(Set<Integer> supportedTypes) {
-                future.complete(supportedTypes.contains(TETHERING_ETHERNET));
-            }
-        };
-
-        try {
-            mTm.registerTetheringEventCallback(mHandler::post, callback);
-            return future.get(TIMEOUT_MS, TimeUnit.MILLISECONDS);
-        } finally {
-            mTm.unregisterTetheringEventCallback(callback);
-        }
-    }
-
     private static final class MyTetheringEventCallback implements TetheringEventCallback {
         private final TetheringManager mTm;
         private final CountDownLatch mTetheringStartedLatch = new CountDownLatch(1);
diff --git a/Tethering/tests/unit/src/com/android/networkstack/tethering/TetheringTest.java b/Tethering/tests/unit/src/com/android/networkstack/tethering/TetheringTest.java
index cc80174..e90d27e 100644
--- a/Tethering/tests/unit/src/com/android/networkstack/tethering/TetheringTest.java
+++ b/Tethering/tests/unit/src/com/android/networkstack/tethering/TetheringTest.java
@@ -144,7 +144,6 @@
 import android.net.TetheringCallbackStartedParcel;
 import android.net.TetheringConfigurationParcel;
 import android.net.TetheringInterface;
-import android.net.TetheringManager;
 import android.net.TetheringRequestParcel;
 import android.net.dhcp.DhcpLeaseParcelable;
 import android.net.dhcp.DhcpServerCallbacks;
@@ -177,7 +176,6 @@
 import android.telephony.PhoneStateListener;
 import android.telephony.TelephonyManager;
 import android.test.mock.MockContentResolver;
-import android.util.ArraySet;
 
 import androidx.annotation.NonNull;
 import androidx.test.filters.SmallTest;
@@ -219,7 +217,6 @@
 import java.util.Collection;
 import java.util.Collections;
 import java.util.List;
-import java.util.Set;
 import java.util.Vector;
 
 @RunWith(AndroidJUnit4.class)
@@ -1732,7 +1729,6 @@
         private final ArrayList<TetherStatesParcel> mTetherStates = new ArrayList<>();
         private final ArrayList<Integer> mOffloadStatus = new ArrayList<>();
         private final ArrayList<List<TetheredClient>> mTetheredClients = new ArrayList<>();
-        private final ArrayList<Long> mSupportedBitmaps = new ArrayList<>();
 
         // This function will remove the recorded callbacks, so it must be called once for
         // each callback. If this is called after multiple callback, the order matters.
@@ -1785,10 +1781,6 @@
             assertTrue(leases.containsAll(result));
         }
 
-        public void expectSupportedTetheringTypes(Set<Integer> expectedTypes) {
-            assertEquals(expectedTypes, TetheringManager.unpackBits(mSupportedBitmaps.remove(0)));
-        }
-
         @Override
         public void onUpstreamChanged(Network network) {
             mActualUpstreams.add(network);
@@ -1821,17 +1813,11 @@
             mTetherStates.add(parcel.states);
             mOffloadStatus.add(parcel.offloadStatus);
             mTetheredClients.add(parcel.tetheredClients);
-            mSupportedBitmaps.add(parcel.supportedTypes);
         }
 
         @Override
         public void onCallbackStopped(int errorCode) { }
 
-        @Override
-        public void onSupportedTetheringTypes(long supportedBitmap) {
-            mSupportedBitmaps.add(supportedBitmap);
-        }
-
         public void assertNoUpstreamChangeCallback() {
             assertTrue(mActualUpstreams.isEmpty());
         }
@@ -2959,81 +2945,53 @@
         runStopUSBTethering();
     }
 
-    public static ArraySet<Integer> getAllSupportedTetheringTypes() {
-        return new ArraySet<>(new Integer[] { TETHERING_USB, TETHERING_NCM, TETHERING_WIFI,
-                TETHERING_WIFI_P2P, TETHERING_BLUETOOTH, TETHERING_ETHERNET });
-    }
-
     @Test
     public void testTetheringSupported() throws Exception {
-        final ArraySet<Integer> expectedTypes = getAllSupportedTetheringTypes();
-        // Check tethering is supported after initialization.
         setTetheringSupported(true /* supported */);
-        TestTetheringEventCallback callback = new TestTetheringEventCallback();
-        mTethering.registerTetheringEventCallback(callback);
-        mLooper.dispatchAll();
-        updateConfigAndVerifySupported(callback, expectedTypes);
+        updateConfigAndVerifySupported(true /* supported */);
 
         // Could disable tethering supported by settings.
         Settings.Global.putInt(mContentResolver, Settings.Global.TETHER_SUPPORTED, 0);
-        updateConfigAndVerifySupported(callback, new ArraySet<>());
+        updateConfigAndVerifySupported(false /* supported */);
 
         // Could disable tethering supported by user restriction.
         setTetheringSupported(true /* supported */);
-        updateConfigAndVerifySupported(callback, expectedTypes);
         when(mUserManager.hasUserRestriction(
                 UserManager.DISALLOW_CONFIG_TETHERING)).thenReturn(true);
-        updateConfigAndVerifySupported(callback, new ArraySet<>());
+        updateConfigAndVerifySupported(false /* supported */);
 
         // Tethering is supported if it has any supported downstream.
         setTetheringSupported(true /* supported */);
-        updateConfigAndVerifySupported(callback, expectedTypes);
-        // Usb tethering is not supported:
-        expectedTypes.remove(TETHERING_USB);
         when(mResources.getStringArray(R.array.config_tether_usb_regexs))
                 .thenReturn(new String[0]);
-        updateConfigAndVerifySupported(callback, expectedTypes);
-        // Wifi tethering is not supported:
-        expectedTypes.remove(TETHERING_WIFI);
+        updateConfigAndVerifySupported(true /* supported */);
         when(mResources.getStringArray(R.array.config_tether_wifi_regexs))
                 .thenReturn(new String[0]);
-        updateConfigAndVerifySupported(callback, expectedTypes);
-        // Bluetooth tethering is not supported:
-        expectedTypes.remove(TETHERING_BLUETOOTH);
-        when(mResources.getStringArray(R.array.config_tether_bluetooth_regexs))
-                .thenReturn(new String[0]);
+        updateConfigAndVerifySupported(true /* supported */);
+
 
         if (isAtLeastT()) {
-            updateConfigAndVerifySupported(callback, expectedTypes);
-
-            // P2p tethering is not supported:
-            expectedTypes.remove(TETHERING_WIFI_P2P);
+            when(mResources.getStringArray(R.array.config_tether_bluetooth_regexs))
+                    .thenReturn(new String[0]);
+            updateConfigAndVerifySupported(true /* supported */);
             when(mResources.getStringArray(R.array.config_tether_wifi_p2p_regexs))
                     .thenReturn(new String[0]);
-            updateConfigAndVerifySupported(callback, expectedTypes);
-            // Ncm tethering is not supported:
-            expectedTypes.remove(TETHERING_NCM);
+            updateConfigAndVerifySupported(true /* supported */);
             when(mResources.getStringArray(R.array.config_tether_ncm_regexs))
                     .thenReturn(new String[0]);
-            updateConfigAndVerifySupported(callback, expectedTypes);
-            // Ethernet tethering (last supported type) is not supported:
-            expectedTypes.remove(TETHERING_ETHERNET);
+            updateConfigAndVerifySupported(true /* supported */);
             mForceEthernetServiceUnavailable = true;
-            updateConfigAndVerifySupported(callback, new ArraySet<>());
-
+            updateConfigAndVerifySupported(false /* supported */);
         } else {
-            // If wifi, usb and bluetooth are all not supported, all the types are not supported.
-            expectedTypes.clear();
-            updateConfigAndVerifySupported(callback, expectedTypes);
+            when(mResources.getStringArray(R.array.config_tether_bluetooth_regexs))
+                    .thenReturn(new String[0]);
+            updateConfigAndVerifySupported(false /* supported */);
         }
     }
 
-    private void updateConfigAndVerifySupported(final TestTetheringEventCallback callback,
-            final ArraySet<Integer> expectedTypes) {
+    private void updateConfigAndVerifySupported(boolean supported) {
         sendConfigurationChanged();
-
-        assertEquals(expectedTypes.size() > 0, mTethering.isTetheringSupported());
-        callback.expectSupportedTetheringTypes(expectedTypes);
+        assertEquals(supported, mTethering.isTetheringSupported());
     }
     // TODO: Test that a request for hotspot mode doesn't interfere with an
     // already operating tethering mode interface.