diff --git a/audio/aidl/default/presetReverb/PresetReverbSw.cpp b/audio/aidl/default/presetReverb/PresetReverbSw.cpp
index 3f02eb7..2ac2010 100644
--- a/audio/aidl/default/presetReverb/PresetReverbSw.cpp
+++ b/audio/aidl/default/presetReverb/PresetReverbSw.cpp
@@ -161,10 +161,6 @@
     return mContext;
 }
 
-std::shared_ptr<EffectContext> PresetReverbSw::getContext() {
-    return mContext;
-}
-
 RetCode PresetReverbSw::releaseContext() {
     if (mContext) {
         mContext.reset();
diff --git a/audio/aidl/default/presetReverb/PresetReverbSw.h b/audio/aidl/default/presetReverb/PresetReverbSw.h
index 9ceee7c..61fc88c 100644
--- a/audio/aidl/default/presetReverb/PresetReverbSw.h
+++ b/audio/aidl/default/presetReverb/PresetReverbSw.h
@@ -56,21 +56,23 @@
     }
 
     ndk::ScopedAStatus getDescriptor(Descriptor* _aidl_return) override;
-    ndk::ScopedAStatus setParameterSpecific(const Parameter::Specific& specific) override;
-    ndk::ScopedAStatus getParameterSpecific(const Parameter::Id& id,
-                                            Parameter::Specific* specific) override;
+    ndk::ScopedAStatus setParameterSpecific(const Parameter::Specific& specific)
+            REQUIRES(mImplMutex) override;
+    ndk::ScopedAStatus getParameterSpecific(const Parameter::Id& id, Parameter::Specific* specific)
+            REQUIRES(mImplMutex) override;
 
-    std::shared_ptr<EffectContext> createContext(const Parameter::Common& common) override;
-    std::shared_ptr<EffectContext> getContext() override;
-    RetCode releaseContext() override;
+    std::shared_ptr<EffectContext> createContext(const Parameter::Common& common)
+            REQUIRES(mImplMutex) override;
+    RetCode releaseContext() REQUIRES(mImplMutex) override;
 
-    IEffect::Status effectProcessImpl(float* in, float* out, int samples) override;
+    IEffect::Status effectProcessImpl(float* in, float* out, int samples)
+            REQUIRES(mImplMutex) override;
     std::string getEffectName() override { return kEffectName; }
 
   private:
-    std::shared_ptr<PresetReverbSwContext> mContext;
+    std::shared_ptr<PresetReverbSwContext> mContext GUARDED_BY(mImplMutex);
 
     ndk::ScopedAStatus getParameterPresetReverb(const PresetReverb::Tag& tag,
-                                                Parameter::Specific* specific);
+                                                Parameter::Specific* specific) REQUIRES(mImplMutex);
 };
 }  // namespace aidl::android::hardware::audio::effect