Merge changes from topic "am-f4faa2c1-7416-4076-9f85-b0cd734dba65" into oc-dev

                io = mPlaybackThreads.keyAt(0);

            }

            ALOGV("createEffect() got io %d for effect %s", io, desc.name);

        } else if (checkPlaybackThread_l(io) != nullptr) {

            // allow only one effect chain per sessionId on mPlaybackThreads.

            for (size_t i = 0; i < mPlaybackThreads.size(); i++) {

                const audio_io_handle_t checkIo = mPlaybackThreads.keyAt(i);

                if (io == checkIo) continue;

                const uint32_t sessionType =

                        mPlaybackThreads.valueAt(i)->hasAudioSession(sessionId);

                if ((sessionType & ThreadBase::EFFECT_SESSION) != 0) {

                    ALOGE("%s: effect %s io %d denied because session %d effect exists on io %d",

                            __func__, desc.name, (int)io, (int)sessionId, (int)checkIo);

                    android_errorWriteLog(0x534e4554, "123237974");

                    lStatus = BAD_VALUE;

                    goto Exit;

                }

            }

        }

        ThreadBase *thread = checkRecordThread_l(io);

        if (thread == NULL) {