diff --git a/services/audioflinger/AudioFlinger.cpp b/services/audioflinger/AudioFlinger.cpp
index 103e18b..0292bc3 100644
--- a/services/audioflinger/AudioFlinger.cpp
+++ b/services/audioflinger/AudioFlinger.cpp
@@ -2688,7 +2688,6 @@
     sp<Track> trackToRemove;
     sp<Track> activeTrack;
     nsecs_t standbyTime = systemTime();
-    int8_t *curBuf;
     size_t mixBufferSize = mFrameCount*mFrameSize;
     uint32_t activeSleepTime = activeSleepTimeUs();
     uint32_t idleSleepTime = idleSleepTimeUs();
@@ -2892,7 +2891,7 @@
         if (CC_LIKELY(mixerStatus == MIXER_TRACKS_READY)) {
             AudioBufferProvider::Buffer buffer;
             size_t frameCount = mFrameCount;
-            curBuf = (int8_t *)mMixBuffer;
+            int8_t *curBuf = (int8_t *)mMixBuffer;
             // output audio to hardware
             while (frameCount) {
                 buffer.frameCount = frameCount;
@@ -3254,7 +3253,7 @@
 {
     Mutex::Autolock _l(mLock);
     for (size_t i = 0; i < mOutputTracks.size(); i++) {
-        if (mOutputTracks[i]->thread() == (ThreadBase *)thread) {
+        if (mOutputTracks[i]->thread() == thread) {
             mOutputTracks[i]->destroy();
             mOutputTracks.removeAt(i);
             updateWaitTime();
@@ -4502,10 +4501,9 @@
 void AudioFlinger::PlaybackThread::OutputTrack::clearBufferQueue()
 {
     size_t size = mBufferQueue.size();
-    Buffer *pBuffer;
 
     for (size_t i = 0; i < size; i++) {
-        pBuffer = mBufferQueue.itemAt(i);
+        Buffer *pBuffer = mBufferQueue.itemAt(i);
         delete [] pBuffer->mBuffer;
         delete pBuffer;
     }
@@ -4577,9 +4575,7 @@
 void AudioFlinger::NotificationClient::binderDied(const wp<IBinder>& who)
 {
     sp<NotificationClient> keep(this);
-    {
-        mAudioFlinger->removeNotificationClient(mPid);
-    }
+    mAudioFlinger->removeNotificationClient(mPid);
 }
 
 // ----------------------------------------------------------------------------
@@ -5555,8 +5551,7 @@
                 }
             }
         }
-        void *param2 = NULL;
-        audioConfigChanged_l(AudioSystem::OUTPUT_CLOSED, output, param2);
+        audioConfigChanged_l(AudioSystem::OUTPUT_CLOSED, output, NULL);
         mPlaybackThreads.removeItem(output);
     }
     thread->exit();
@@ -5700,8 +5695,7 @@
         }
 
         ALOGV("closeInput() %d", input);
-        void *param2 = NULL;
-        audioConfigChanged_l(AudioSystem::INPUT_CLOSED, input, param2);
+        audioConfigChanged_l(AudioSystem::INPUT_CLOSED, input, NULL);
         mRecordThreads.removeItem(input);
     }
     thread->exit();
@@ -5733,8 +5727,7 @@
 
     for (size_t i = 0; i < mPlaybackThreads.size(); i++) {
         PlaybackThread *thread = mPlaybackThreads.valueAt(i).get();
-        if (thread != dstThread &&
-            thread->type() != ThreadBase::DIRECT) {
+        if (thread != dstThread && thread->type() != ThreadBase::DIRECT) {
             MixerThread *srcThread = (MixerThread *)thread;
             srcThread->setStreamValid(stream, false);
             srcThread->invalidateTracks(stream);
@@ -5857,33 +5850,20 @@
 // checkPlaybackThread_l() must be called with AudioFlinger::mLock held
 AudioFlinger::PlaybackThread *AudioFlinger::checkPlaybackThread_l(audio_io_handle_t output) const
 {
-    PlaybackThread *thread = NULL;
-    if (mPlaybackThreads.indexOfKey(output) >= 0) {
-        thread = (PlaybackThread *)mPlaybackThreads.valueFor(output).get();
-    }
-    return thread;
+    return mPlaybackThreads.valueFor(output).get();
 }
 
 // checkMixerThread_l() must be called with AudioFlinger::mLock held
 AudioFlinger::MixerThread *AudioFlinger::checkMixerThread_l(audio_io_handle_t output) const
 {
     PlaybackThread *thread = checkPlaybackThread_l(output);
-    if (thread != NULL) {
-        if (thread->type() == ThreadBase::DIRECT) {
-            thread = NULL;
-        }
-    }
-    return (MixerThread *)thread;
+    return thread != NULL && thread->type() != ThreadBase::DIRECT ? (MixerThread *) thread : NULL;
 }
 
 // checkRecordThread_l() must be called with AudioFlinger::mLock held
 AudioFlinger::RecordThread *AudioFlinger::checkRecordThread_l(audio_io_handle_t input) const
 {
-    RecordThread *thread = NULL;
-    if (mRecordThreads.indexOfKey(input) >= 0) {
-        thread = (RecordThread *)mRecordThreads.valueFor(input).get();
-    }
-    return thread;
+    return mRecordThreads.valueFor(input).get();
 }
 
 uint32_t AudioFlinger::nextUniqueId()
@@ -6246,10 +6226,7 @@
         goto Exit;
     }
     // Only Pre processor effects are allowed on input threads and only on input threads
-    if ((mType == RECORD &&
-            (desc->flags & EFFECT_FLAG_TYPE_MASK) != EFFECT_FLAG_TYPE_PRE_PROC) ||
-            (mType != RECORD &&
-                    (desc->flags & EFFECT_FLAG_TYPE_MASK) == EFFECT_FLAG_TYPE_PRE_PROC)) {
+    if ((mType == RECORD) != ((desc->flags & EFFECT_FLAG_TYPE_MASK) == EFFECT_FLAG_TYPE_PRE_PROC)) {
         ALOGW("createEffect_l() effect %s (flags %08x) created on wrong thread type %d",
                 desc->name, desc->flags, mType);
         lStatus = BAD_VALUE;
diff --git a/services/audioflinger/AudioFlinger.h b/services/audioflinger/AudioFlinger.h
index 9396a0b..50712cf 100644
--- a/services/audioflinger/AudioFlinger.h
+++ b/services/audioflinger/AudioFlinger.h
@@ -766,7 +766,7 @@
             virtual status_t    start(pid_t tid);
             virtual void        stop();
                     bool        write(int16_t* data, uint32_t frames);
-                    bool        bufferQueueEmpty() const { return (mBufferQueue.size() == 0) ? true : false; }
+                    bool        bufferQueueEmpty() const { return mBufferQueue.size() == 0; }
                     bool        isActive() const { return mActive; }
             const wp<ThreadBase>& thread() const { return mThread; }
 
@@ -994,8 +994,8 @@
               uint32_t nextUniqueId();
 
               status_t moveEffectChain_l(int sessionId,
-                                     AudioFlinger::PlaybackThread *srcThread,
-                                     AudioFlinger::PlaybackThread *dstThread,
+                                     PlaybackThread *srcThread,
+                                     PlaybackThread *dstThread,
                                      bool reRegister);
               PlaybackThread *primaryPlaybackThread_l();
               uint32_t primaryOutputDevice_l();
diff --git a/services/audioflinger/AudioMixer.cpp b/services/audioflinger/AudioMixer.cpp
index c399691..f3bf953 100644
--- a/services/audioflinger/AudioMixer.cpp
+++ b/services/audioflinger/AudioMixer.cpp
@@ -556,7 +556,7 @@
     }
     t->prevVolume[0] = vl;
     t->prevVolume[1] = vr;
-    t->adjustVolumeRamp((aux != NULL));
+    t->adjustVolumeRamp(aux != NULL);
 }
 
 void AudioMixer::volumeStereo(track_t* t, int32_t* out, size_t frameCount, int32_t* temp, int32_t* aux)
@@ -862,7 +862,7 @@
                 while (outFrames) {
                     size_t inFrames = (t.frameCount > outFrames)?outFrames:t.frameCount;
                     if (inFrames) {
-                        (t.hook)(&t, outTemp + (BLOCKSIZE-outFrames)*MAX_NUM_CHANNELS, inFrames, state->resampleTemp, aux);
+                        t.hook(&t, outTemp + (BLOCKSIZE-outFrames)*MAX_NUM_CHANNELS, inFrames, state->resampleTemp, aux);
                         t.frameCount -= inFrames;
                         outFrames -= inFrames;
                         if (CC_UNLIKELY(aux != NULL)) {
@@ -944,7 +944,7 @@
             // the resampler.
             if ((t.needs & NEEDS_RESAMPLE__MASK) == NEEDS_RESAMPLE_ENABLED) {
                 t.resampler->setPTS(pts);
-                (t.hook)(&t, outTemp, numFrames, state->resampleTemp, aux);
+                t.hook(&t, outTemp, numFrames, state->resampleTemp, aux);
             } else {
 
                 size_t outFrames = 0;
@@ -961,7 +961,7 @@
                     if (CC_UNLIKELY(aux != NULL)) {
                         aux += outFrames;
                     }
-                    (t.hook)(&t, outTemp + outFrames*MAX_NUM_CHANNELS, t.buffer.frameCount, state->resampleTemp, aux);
+                    t.hook(&t, outTemp + outFrames*MAX_NUM_CHANNELS, t.buffer.frameCount, state->resampleTemp, aux);
                     outFrames += t.buffer.frameCount;
                     t.bufferProvider->releaseBuffer(&t.buffer);
                 }
diff --git a/services/audioflinger/AudioMixer.h b/services/audioflinger/AudioMixer.h
index f442671..c3174ae 100644
--- a/services/audioflinger/AudioMixer.h
+++ b/services/audioflinger/AudioMixer.h
@@ -114,7 +114,6 @@
     struct state_t;
     struct track_t;
 
-    typedef void (*mix_t)(state_t* state, int64_t pts);
     typedef void (*hook_t)(track_t* t, int32_t* output, size_t numOutFrames, int32_t* temp, int32_t* aux);
     static const int BLOCKSIZE = 16; // 4 cache lines
 
@@ -167,7 +166,7 @@
         uint32_t        enabledTracks;
         uint32_t        needsChanged;
         size_t          frameCount;
-        mix_t           hook;
+        void            (*hook)(state_t* state, int64_t pts);   // one of process__*, never NULL
         int32_t         *outputTemp;
         int32_t         *resampleTemp;
         int32_t         reserved[2];
diff --git a/services/audioflinger/AudioPolicyService.cpp b/services/audioflinger/AudioPolicyService.cpp
index 364fd22..987b039 100644
--- a/services/audioflinger/AudioPolicyService.cpp
+++ b/services/audioflinger/AudioPolicyService.cpp
@@ -604,8 +604,7 @@
 {
     Vector<sp<AudioEffect> > fxVector = inputDesc->mEffects;
     for (size_t i = 0; i < fxVector.size(); i++) {
-        sp<AudioEffect> fx = fxVector.itemAt(i);
-        fx->setEnabled(enabled);
+        fxVector.itemAt(i)->setEnabled(enabled);
     }
 }