diff --git a/services/audioflinger/Effects.h b/services/audioflinger/Effects.h
index b516c37..d107543 100644
--- a/services/audioflinger/Effects.h
+++ b/services/audioflinger/Effects.h
@@ -217,7 +217,8 @@
     }
     status_t setDevices(const AudioDeviceTypeAddrVector& devices) final EXCLUDES_EffectBase_Mutex;
     status_t setInputDevice(const AudioDeviceTypeAddr& device) final EXCLUDES_EffectBase_Mutex;
-    status_t setVolume(uint32_t *left, uint32_t *right, bool controller, bool force) final;
+    status_t setVolume_l(uint32_t* left, uint32_t* right, bool controller, bool force) final
+            REQUIRES(audio_utils::EffectChain_Mutex);
     status_t setMode(audio_mode_t mode) final EXCLUDES_EffectBase_Mutex;
     status_t setAudioSource(audio_source_t source) final EXCLUDES_EffectBase_Mutex;
     status_t start_l() final REQUIRES(audio_utils::EffectChain_Mutex) EXCLUDES_EffectBase_Mutex;
@@ -265,8 +266,8 @@
                 ? EFFECT_BUFFER_ACCESS_WRITE : EFFECT_BUFFER_ACCESS_ACCUMULATE;
     }
 
-    status_t setVolumeInternal(uint32_t *left, uint32_t *right, bool controller);
-
+    status_t setVolumeInternal(uint32_t* left, uint32_t* right,
+                               bool controller /* the volume controller effect of the chain */);
 
     effect_config_t     mConfig;    // input and output audio configuration
     sp<EffectHalInterface> mEffectInterface; // Effect module HAL