diff --git a/core/java/android/hardware/usb/UsbManager.java b/core/java/android/hardware/usb/UsbManager.java
index 3df57bc..ee646c0 100644
--- a/core/java/android/hardware/usb/UsbManager.java
+++ b/core/java/android/hardware/usb/UsbManager.java
@@ -181,6 +181,14 @@
     public static final String USB_DATA_UNLOCKED = "unlocked";
 
     /**
+     * Boolean extra indicating whether the intent represents a change in the usb
+     * configuration (as opposed to a state update).
+     *
+     * {@hide}
+     */
+    public static final String USB_CONFIG_CHANGED = "config_changed";
+
+    /**
      * A placeholder indicating that no USB function is being specified.
      * Used to distinguish between selecting no function vs. the default function in
      * {@link #setCurrentFunction(String)}.
diff --git a/media/java/android/mtp/MtpServer.java b/media/java/android/mtp/MtpServer.java
index 61fbfb9..3c2ea58 100644
--- a/media/java/android/mtp/MtpServer.java
+++ b/media/java/android/mtp/MtpServer.java
@@ -67,6 +67,11 @@
         native_remove_storage(storage.getStorageId());
     }
 
+    public static void configure(boolean usePtp) {
+        native_configure(usePtp);
+    }
+
+    public static native final void native_configure(boolean usePtp);
     private native final void native_setup(MtpDatabase database, boolean usePtp);
     private native final void native_run();
     private native final void native_cleanup();
diff --git a/media/jni/android_mtp_MtpServer.cpp b/media/jni/android_mtp_MtpServer.cpp
index d13187c..afd3082 100644
--- a/media/jni/android_mtp_MtpServer.cpp
+++ b/media/jni/android_mtp_MtpServer.cpp
@@ -56,17 +56,16 @@
     return (MtpServer*)env->GetLongField(thiz, field_MtpServer_nativeContext);
 }
 
+static void android_mtp_configure(JNIEnv *, jobject, jboolean usePtp) {
+    MtpServer::configure(usePtp);
+}
+
 static void
 android_mtp_MtpServer_setup(JNIEnv *env, jobject thiz, jobject javaDatabase, jboolean usePtp)
 {
-    int fd = open("/dev/mtp_usb", O_RDWR);
-    if (fd >= 0) {
-        MtpServer* server = new MtpServer(fd, getMtpDatabase(env, javaDatabase),
-                usePtp, AID_MEDIA_RW, 0664, 0775);
-        env->SetLongField(thiz, field_MtpServer_nativeContext, (jlong)server);
-    } else {
-        ALOGE("could not open MTP driver, errno: %d", errno);
-    }
+    MtpServer* server = new MtpServer(getMtpDatabase(env, javaDatabase),
+            usePtp, AID_MEDIA_RW, 0664, 0775);
+    env->SetLongField(thiz, field_MtpServer_nativeContext, (jlong)server);
 }
 
 static void
@@ -180,6 +179,7 @@
 // ----------------------------------------------------------------------------
 
 static const JNINativeMethod gMethods[] = {
+    {"native_configure",              "(Z)V",  (void *)android_mtp_configure},
     {"native_setup",                "(Landroid/mtp/MtpDatabase;Z)V",
                                             (void *)android_mtp_MtpServer_setup},
     {"native_run",                  "()V",  (void *)android_mtp_MtpServer_run},
diff --git a/services/usb/java/com/android/server/usb/UsbDeviceManager.java b/services/usb/java/com/android/server/usb/UsbDeviceManager.java
index 15a1e76..b3f5630 100644
--- a/services/usb/java/com/android/server/usb/UsbDeviceManager.java
+++ b/services/usb/java/com/android/server/usb/UsbDeviceManager.java
@@ -351,8 +351,6 @@
                             UsbManager.removeFunction(persisted, UsbManager.USB_FUNCTION_MTP));
                 }
 
-                setEnabledFunctions(null, false, false);
-
                 String state = FileUtils.readTextFile(new File(STATE_PATH), 0, null).trim();
                 updateState(state);
 
@@ -446,13 +444,12 @@
             return false;
         }
 
-        private boolean setUsbConfig(String config) {
+        private void setUsbConfig(String config) {
             if (DEBUG) Slog.d(TAG, "setUsbConfig(" + config + ")");
             // set the new configuration
             // we always set it due to b/23631400, where adbd was getting killed
             // and not restarted due to property timeouts on some devices
             SystemProperties.set(USB_CONFIG_PROPERTY, config);
-            return waitForState(config);
         }
 
         private void setAdbEnabled(boolean enable) {
@@ -547,8 +544,18 @@
                 // Kick the USB stack to close existing connections.
                 setUsbConfig(UsbManager.USB_FUNCTION_NONE);
 
+                if (!waitForState(UsbManager.USB_FUNCTION_NONE)) {
+                    Slog.e(TAG, "Failed to kick USB config");
+                    return false;
+                }
+
                 // Set the new USB configuration.
-                if (!setUsbConfig(functions)) {
+                setUsbConfig(functions);
+
+                // Start up dependent services.
+                updateUsbStateBroadcastIfNeeded(true);
+
+                if (!waitForState(functions)) {
                     Slog.e(TAG, "Failed to switch USB config to " + functions);
                     return false;
                 }
@@ -631,7 +638,7 @@
             return false;
         }
 
-        private void updateUsbStateBroadcastIfNeeded() {
+        private void updateUsbStateBroadcastIfNeeded(boolean configChanged) {
             // send a sticky broadcast containing current USB state
             Intent intent = new Intent(UsbManager.ACTION_USB_STATE);
             intent.addFlags(Intent.FLAG_RECEIVER_REPLACE_PENDING
@@ -640,6 +647,7 @@
             intent.putExtra(UsbManager.USB_HOST_CONNECTED, mHostConnected);
             intent.putExtra(UsbManager.USB_CONFIGURED, mConfigured);
             intent.putExtra(UsbManager.USB_DATA_UNLOCKED, isUsbTransferAllowed() && mUsbDataUnlocked);
+            intent.putExtra(UsbManager.USB_CONFIG_CHANGED, configChanged);
 
             if (mCurrentFunctions != null) {
                 String[] functions = mCurrentFunctions.split(",");
@@ -737,7 +745,7 @@
                         setEnabledFunctions(null, false, false);
                     }
                     if (mBootCompleted) {
-                        updateUsbStateBroadcastIfNeeded();
+                        updateUsbStateBroadcastIfNeeded(false);
                         updateUsbFunctions();
                     }
                     break;
@@ -749,7 +757,7 @@
                     args.recycle();
                     updateUsbNotification();
                     if (mBootCompleted) {
-                        updateUsbStateBroadcastIfNeeded();
+                        updateUsbStateBroadcastIfNeeded(false);
                     }
                     break;
                 case MSG_ENABLE_ADB:
@@ -765,11 +773,11 @@
                 case MSG_SYSTEM_READY:
                     updateUsbNotification();
                     updateAdbNotification();
-                    updateUsbStateBroadcastIfNeeded();
                     updateUsbFunctions();
                     break;
                 case MSG_BOOT_COMPLETED:
                     mBootCompleted = true;
+                    setEnabledFunctions(null, false, false);
                     if (mCurrentAccessory != null) {
                         getCurrentSettings().accessoryAttached(mCurrentAccessory);
                     }