Merge "Add a log message if enabling Ethernet tethering if it is already enabled." into rvc-dev

                Context.ETHERNET_SERVICE);

        synchronized (mPublicSync) {

            if (enable) {

                if (mEthernetCallback != null) return TETHER_ERROR_NO_ERROR;

                if (mEthernetCallback != null) {

                    Log.d(TAG, "Ethernet tethering already started");

                    return TETHER_ERROR_NO_ERROR;

                }

                mEthernetCallback = new EthernetCallback();

                mEthernetIfaceRequest = em.requestTetheredInterface(mExecutor, mEthernetCallback);