diff --git a/audio/2.0/default/Device.cpp b/audio/2.0/default/Device.cpp
index 280d320..3727966 100644
--- a/audio/2.0/default/Device.cpp
+++ b/audio/2.0/default/Device.cpp
@@ -17,11 +17,9 @@
 #define LOG_TAG "DeviceHAL"
 //#define LOG_NDEBUG 0
 
+#include <algorithm>
 #include <memory.h>
 #include <string.h>
-#include <algorithm>
-#include <mutex>
-#include <vector>
 
 #include <android/log.h>
 
@@ -38,57 +36,8 @@
 namespace V2_0 {
 namespace implementation {
 
-namespace {
-
-class Diagnostics {
-   public:
-    static Diagnostics& getInstance() {
-        std::lock_guard<std::mutex> _(mLock);
-        if (mInstance == nullptr) {
-            mInstance = new Diagnostics;
-        }
-        return *mInstance;
-    }
-
-    void registerDevice(Device* dev) {
-        std::lock_guard<std::mutex> _(mLock);
-        mDevices.push_back(wp<Device>(dev));
-    }
-
-    void checkForErasedHalCblk(const Device* dev) {
-        if (dev->version() != 0) return;  // all OK
-
-        std::ostringstream ss;
-        ss << "Zero HAL CB for " << dev->type() << ":" << std::hex
-           << dev->device() << "; Others: ";
-        {
-            std::lock_guard<std::mutex> _(mLock);
-            for (auto wp : mDevices) {
-                sp<Device> other{wp.promote()};
-                if (other.get() == nullptr || other.get() == dev) continue;
-                ss << other->type() << ":" << other->version() << ":"
-                   << std::hex << other->device() << "; ";
-            }
-        }
-        ALOGE("%s", ss.str().c_str());
-    }
-
-   private:
-    Diagnostics() {}
-
-    static std::mutex mLock;
-    static Diagnostics* mInstance;
-    std::vector<wp<Device>> mDevices;
-};
-
-std::mutex Diagnostics::mLock;
-Diagnostics* Diagnostics::mInstance{nullptr};
-
-}  // namespace
-
-Device::Device(audio_hw_device_t* device, const char* type)
-    : mDevice{device}, mType{type} {
-    Diagnostics::getInstance().registerDevice(this);
+Device::Device(audio_hw_device_t* device)
+        : mDevice(device) {
 }
 
 Device::~Device() {
@@ -127,12 +76,10 @@
 }
 
 char* Device::halGetParameters(const char* keys) {
-    Diagnostics::getInstance().checkForErasedHalCblk(this);
     return mDevice->get_parameters(mDevice, keys);
 }
 
 int Device::halSetParameters(const char* keysAndValues) {
-    Diagnostics::getInstance().checkForErasedHalCblk(this);
     return mDevice->set_parameters(mDevice, keysAndValues);
 }
 
diff --git a/audio/2.0/default/Device.h b/audio/2.0/default/Device.h
index 55bd0ab..7738361 100644
--- a/audio/2.0/default/Device.h
+++ b/audio/2.0/default/Device.h
@@ -56,7 +56,7 @@
 using ::android::sp;
 
 struct Device : public IDevice, public ParametersUtil {
-    Device(audio_hw_device_t* device, const char* type);
+    explicit Device(audio_hw_device_t* device);
 
     // Methods from ::android::hardware::audio::V2_0::IDevice follow.
     Return<Result> initCheck()  override;
@@ -101,18 +101,17 @@
     void closeInputStream(audio_stream_in_t* stream);
     void closeOutputStream(audio_stream_out_t* stream);
     audio_hw_device_t* device() const { return mDevice; }
-    const char* type() const { return mType; }
-    uint32_t version() const { return mDevice->common.version; }
 
-   private:
+  private:
     audio_hw_device_t *mDevice;
-    const char* mType;
 
     virtual ~Device();
 
     // Methods from ParametersUtil.
     char* halGetParameters(const char* keys) override;
     int halSetParameters(const char* keysAndValues) override;
+
+    uint32_t version() const { return mDevice->common.version; }
 };
 
 }  // namespace implementation
diff --git a/audio/2.0/default/DevicesFactory.cpp b/audio/2.0/default/DevicesFactory.cpp
index b344968..b913bc7 100644
--- a/audio/2.0/default/DevicesFactory.cpp
+++ b/audio/2.0/default/DevicesFactory.cpp
@@ -86,7 +86,7 @@
                 result = new PrimaryDevice(halDevice);
             } else {
                 result = new ::android::hardware::audio::V2_0::implementation::
-                    Device(halDevice, moduleName);
+                    Device(halDevice);
             }
             retval = Result::OK;
         } else if (halStatus == -EINVAL) {
diff --git a/audio/2.0/default/PrimaryDevice.cpp b/audio/2.0/default/PrimaryDevice.cpp
index 746d873..a4a8206 100644
--- a/audio/2.0/default/PrimaryDevice.cpp
+++ b/audio/2.0/default/PrimaryDevice.cpp
@@ -26,7 +26,8 @@
 namespace implementation {
 
 PrimaryDevice::PrimaryDevice(audio_hw_device_t* device)
-    : mDevice{new Device(device, AUDIO_HARDWARE_MODULE_ID_PRIMARY)} {}
+        : mDevice(new Device(device)) {
+}
 
 PrimaryDevice::~PrimaryDevice() {}