diff --git a/include/media/AudioSystem.h b/include/media/AudioSystem.h
index 89bc95d..d54ab35 100644
--- a/include/media/AudioSystem.h
+++ b/include/media/AudioSystem.h
@@ -218,8 +218,8 @@
         // IAudioFlingerClient
 
         // indicate a change in the configuration of an output or input: keeps the cached
-        // values for output/input parameters upto date in client process
-        virtual void ioConfigChanged(int event, audio_io_handle_t ioHandle, void *param2);
+        // values for output/input parameters up-to-date in client process
+        virtual void ioConfigChanged(int event, audio_io_handle_t ioHandle, const void *param2);
     };
 
     class AudioPolicyServiceClient: public IBinder::DeathRecipient
diff --git a/include/media/IAudioFlingerClient.h b/include/media/IAudioFlingerClient.h
index f3b4df1..75a9971 100644
--- a/include/media/IAudioFlingerClient.h
+++ b/include/media/IAudioFlingerClient.h
@@ -33,7 +33,7 @@
     DECLARE_META_INTERFACE(AudioFlingerClient);
 
     // Notifies a change of audio input/output configuration.
-    virtual void ioConfigChanged(int event, audio_io_handle_t ioHandle, void *param2) = 0;
+    virtual void ioConfigChanged(int event, audio_io_handle_t ioHandle, const void *param2) = 0;
 
 };
 
diff --git a/media/libmedia/AudioSystem.cpp b/media/libmedia/AudioSystem.cpp
index ec4c044..e0b186a 100644
--- a/media/libmedia/AudioSystem.cpp
+++ b/media/libmedia/AudioSystem.cpp
@@ -405,9 +405,9 @@
 }
 
 void AudioSystem::AudioFlingerClient::ioConfigChanged(int event, audio_io_handle_t ioHandle,
-        void *param2) {
+        const void *param2) {
     ALOGV("ioConfigChanged() event %d", event);
-    OutputDescriptor *desc;
+    const OutputDescriptor *desc;
     audio_stream_type_t stream;
 
     if (ioHandle == 0) return;
@@ -417,7 +417,7 @@
     switch (event) {
     case STREAM_CONFIG_CHANGED:
         if (param2 == NULL) break;
-        stream = *(audio_stream_type_t *)param2;
+        stream = *(const audio_stream_type_t *)param2;
         ALOGV("ioConfigChanged() STREAM_CONFIG_CHANGED stream %d, output %d", stream, ioHandle);
         if (gStreamOutputMap.indexOfKey(stream) >= 0) {
             gStreamOutputMap.replaceValueFor(stream, ioHandle);
@@ -429,7 +429,7 @@
             break;
         }
         if (param2 == NULL) break;
-        desc = (OutputDescriptor *)param2;
+        desc = (const OutputDescriptor *)param2;
 
         OutputDescriptor *outputDesc =  new OutputDescriptor(*desc);
         gOutputs.add(ioHandle, outputDesc);
@@ -458,7 +458,7 @@
             break;
         }
         if (param2 == NULL) break;
-        desc = (OutputDescriptor *)param2;
+        desc = (const OutputDescriptor *)param2;
 
         ALOGV("ioConfigChanged() new config for output %d samplingRate %d, format %d channels %d frameCount %d latency %d",
                 ioHandle, desc->samplingRate, desc->format,
diff --git a/media/libmedia/IAudioFlingerClient.cpp b/media/libmedia/IAudioFlingerClient.cpp
index ce28b33..1db39a3 100644
--- a/media/libmedia/IAudioFlingerClient.cpp
+++ b/media/libmedia/IAudioFlingerClient.cpp
@@ -39,18 +39,18 @@
     {
     }
 
-    void ioConfigChanged(int event, audio_io_handle_t ioHandle, void *param2)
+    void ioConfigChanged(int event, audio_io_handle_t ioHandle, const void *param2)
     {
         Parcel data, reply;
         data.writeInterfaceToken(IAudioFlingerClient::getInterfaceDescriptor());
         data.writeInt32(event);
         data.writeInt32((int32_t) ioHandle);
         if (event == AudioSystem::STREAM_CONFIG_CHANGED) {
-            uint32_t stream = *(uint32_t *)param2;
+            uint32_t stream = *(const uint32_t *)param2;
             ALOGV("ioConfigChanged stream %d", stream);
             data.writeInt32(stream);
         } else if (event != AudioSystem::OUTPUT_CLOSED && event != AudioSystem::INPUT_CLOSED) {
-            AudioSystem::OutputDescriptor *desc = (AudioSystem::OutputDescriptor *)param2;
+            const AudioSystem::OutputDescriptor *desc = (const AudioSystem::OutputDescriptor *)param2;
             data.writeInt32(desc->samplingRate);
             data.writeInt32(desc->format);
             data.writeInt32(desc->channels);
@@ -73,7 +73,7 @@
             CHECK_INTERFACE(IAudioFlingerClient, data, reply);
             int event = data.readInt32();
             audio_io_handle_t ioHandle = (audio_io_handle_t) data.readInt32();
-            void *param2 = NULL;
+            const void *param2 = NULL;
             AudioSystem::OutputDescriptor desc;
             uint32_t stream;
             if (event == AudioSystem::STREAM_CONFIG_CHANGED) {
diff --git a/services/audioflinger/AudioFlinger.cpp b/services/audioflinger/AudioFlinger.cpp
index d8a5d99..97a8f8b 100644
--- a/services/audioflinger/AudioFlinger.cpp
+++ b/services/audioflinger/AudioFlinger.cpp
@@ -1053,7 +1053,7 @@
 }
 
 // audioConfigChanged_l() must be called with AudioFlinger::mLock held
-void AudioFlinger::audioConfigChanged_l(int event, audio_io_handle_t ioHandle, void *param2)
+void AudioFlinger::audioConfigChanged_l(int event, audio_io_handle_t ioHandle, const void *param2)
 {
     size_t size = mNotificationClients.size();
     for (size_t i = 0; i < size; i++) {
diff --git a/services/audioflinger/AudioFlinger.h b/services/audioflinger/AudioFlinger.h
index 336c777..7fc6cc2 100644
--- a/services/audioflinger/AudioFlinger.h
+++ b/services/audioflinger/AudioFlinger.h
@@ -1063,7 +1063,7 @@
               // no range check, doesn't check per-thread stream volume, AudioFlinger::mLock held
               float streamVolume_l(audio_stream_type_t stream) const
                                 { return mStreamTypes[stream].volume; }
-              void audioConfigChanged_l(int event, audio_io_handle_t ioHandle, void *param2);
+              void audioConfigChanged_l(int event, audio_io_handle_t ioHandle, const void *param2);
 
               // allocate an audio_io_handle_t, session ID, or effect ID
               uint32_t nextUniqueId();