diff --git a/bluetooth/1.0/default/bluetooth_hci.cc b/bluetooth/1.0/default/bluetooth_hci.cc
index 869c723..a2211f4 100644
--- a/bluetooth/1.0/default/bluetooth_hci.cc
+++ b/bluetooth/1.0/default/bluetooth_hci.cc
@@ -33,8 +33,7 @@
 
 class BluetoothDeathRecipient : public hidl_death_recipient {
  public:
-  BluetoothDeathRecipient(const sp<IBluetoothHci> hci)
-    : mHci(hci), has_died_(false) {}
+  BluetoothDeathRecipient(const sp<IBluetoothHci> hci) : mHci(hci) {}
 
   virtual void serviceDied(
       uint64_t /*cookie*/,
@@ -52,7 +51,7 @@
 };
 
 BluetoothHci::BluetoothHci()
-    : death_recipient_(new BluetoothDeathRecipient(this)) {bt_enabled = 0;}
+    : death_recipient_(new BluetoothDeathRecipient(this)) {}
 
 Return<void> BluetoothHci::initialize(
     const ::android::sp<IBluetoothHciCallbacks>& cb) {
@@ -62,19 +61,8 @@
     return Void();
   }
 
-  if (bt_enabled == 1) {
-    ALOGE("initialize was called!");
-    return Void();
-  }
-  bt_enabled = 1;
   death_recipient_->setHasDied(false);
   cb->linkToDeath(death_recipient_, 0);
-  unlink_cb_ = [cb](sp<BluetoothDeathRecipient>& death_recipient) {
-    if (death_recipient->getHasDied())
-      ALOGI("Skipping unlink call, service died.");
-    else
-      cb->unlinkToDeath(death_recipient);
-  };
 
   bool rc = VendorInterface::Initialize(
       [cb](bool status) {
@@ -124,12 +112,6 @@
 
 Return<void> BluetoothHci::close() {
   ALOGI("BluetoothHci::close()");
-
-  if (bt_enabled != 1) {
-    ALOGE("should initialize first!");
-    return Void();
-  }
-  bt_enabled = 0;
   unlink_cb_(death_recipient_);
   VendorInterface::Shutdown();
   return Void();
@@ -152,11 +134,6 @@
 
 void BluetoothHci::sendDataToController(const uint8_t type,
                                         const hidl_vec<uint8_t>& data) {
-  if (bt_enabled != 1) {
-    ALOGE("should initialize first!");
-    return;
-  }
-
   VendorInterface::get()->Send(type, data.data(), data.size());
 }
 
diff --git a/bluetooth/1.0/default/bluetooth_hci.h b/bluetooth/1.0/default/bluetooth_hci.h
index 5130c87..c966990 100644
--- a/bluetooth/1.0/default/bluetooth_hci.h
+++ b/bluetooth/1.0/default/bluetooth_hci.h
@@ -48,7 +48,6 @@
   void sendDataToController(const uint8_t type, const hidl_vec<uint8_t>& data);
   ::android::sp<BluetoothDeathRecipient> death_recipient_;
   std::function<void(sp<BluetoothDeathRecipient>&)> unlink_cb_;
-  int bt_enabled;
 };
 
 extern "C" IBluetoothHci* HIDL_FETCH_IBluetoothHci(const char* name);
diff --git a/bluetooth/1.0/default/vendor_interface.cc b/bluetooth/1.0/default/vendor_interface.cc
index c23d667..1d15dd6 100644
--- a/bluetooth/1.0/default/vendor_interface.cc
+++ b/bluetooth/1.0/default/vendor_interface.cc
@@ -36,8 +36,6 @@
     "BLUETOOTH_VENDOR_LIB_INTERFACE";
 
 static const int INVALID_FD = -1;
-std::mutex vendor_mutex_;
-std::mutex initcb_mutex_;
 
 namespace {
 
@@ -49,25 +47,13 @@
   uint16_t opcode;
 } internal_command;
 
-enum {
-  VENDOR_STATE_INIT = 1,
-  VENDOR_STATE_OPENING,	/* during opening */
-  VENDOR_STATE_OPENED,	/* open in fops_open */
-  VENDOR_STATE_CLOSING,	/* during closing */
-  VENDOR_STATE_CLOSED,	/* closed */
-
-  VENDOR_STATE_MSG_NUM
-} ;
-
-uint8_t vstate = VENDOR_STATE_INIT;
-
 // True when LPM is not enabled yet or wake is not asserted.
 bool lpm_wake_deasserted;
 uint32_t lpm_timeout_ms;
 bool recent_activity_flag;
 
 VendorInterface* g_vendor_interface = nullptr;
-static VendorInterface vendor_interface;
+std::mutex wakeup_mutex_;
 
 HC_BT_HDR* WrapPacketAndCopy(uint16_t event, const hidl_vec<uint8_t>& data) {
   size_t packet_size = data.size() + sizeof(HC_BT_HDR);
@@ -181,8 +167,11 @@
     InitializeCompleteCallback initialize_complete_cb,
     PacketReadCallback event_cb, PacketReadCallback acl_cb,
     PacketReadCallback sco_cb, PacketReadCallback iso_cb) {
-  ALOGI("%s: VendorInterface::Initialize", __func__);
-  g_vendor_interface = &vendor_interface;
+  if (g_vendor_interface) {
+    ALOGE("%s: No previous Shutdown()?", __func__);
+    return false;
+  }
+  g_vendor_interface = new VendorInterface();
   return g_vendor_interface->Open(initialize_complete_cb, event_cb, acl_cb,
                                   sco_cb, iso_cb);
 }
@@ -190,8 +179,9 @@
 void VendorInterface::Shutdown() {
   LOG_ALWAYS_FATAL_IF(!g_vendor_interface, "%s: No Vendor interface!",
                       __func__);
-  ALOGI("%s: VendorInterface::Shutdown", __func__);
   g_vendor_interface->Close();
+  delete g_vendor_interface;
+  g_vendor_interface = nullptr;
 }
 
 VendorInterface* VendorInterface::get() { return g_vendor_interface; }
@@ -201,189 +191,144 @@
                            PacketReadCallback acl_cb,
                            PacketReadCallback sco_cb,
                            PacketReadCallback iso_cb) {
-  {
-    std::unique_lock<std::mutex> guard(vendor_mutex_);
-    if (vstate == VENDOR_STATE_OPENED) {
-      ALOGW("VendorInterface opened!");
-      return true;
-    }
+  initialize_complete_cb_ = initialize_complete_cb;
 
-    if ((vstate == VENDOR_STATE_CLOSING) ||
-        (vstate == VENDOR_STATE_OPENING)) {
-      ALOGW("VendorInterface open/close is on-going !");
-      return true;
-    }
+  // Initialize vendor interface
 
-    vstate = VENDOR_STATE_OPENING;
-    ALOGI("%s: VendorInterface::Open", __func__);
+  lib_handle_ = dlopen(VENDOR_LIBRARY_NAME, RTLD_NOW);
+  if (!lib_handle_) {
+    ALOGE("%s unable to open %s (%s)", __func__, VENDOR_LIBRARY_NAME,
+          dlerror());
+    return false;
+  }
 
-    initialize_complete_cb_ = initialize_complete_cb;
-    // Initialize vendor interface
-
-    lib_handle_ = dlopen(VENDOR_LIBRARY_NAME, RTLD_NOW);
-    if (!lib_handle_) {
-      ALOGE("%s unable to open %s (%s)", __func__, VENDOR_LIBRARY_NAME,
-            dlerror());
-      return false;
-    }
-
-    lib_interface_ = reinterpret_cast<bt_vendor_interface_t*>(
-        dlsym(lib_handle_, VENDOR_LIBRARY_SYMBOL_NAME));
-    if (!lib_interface_) {
-      ALOGE("%s unable to find symbol %s in %s (%s)", __func__,
-            VENDOR_LIBRARY_SYMBOL_NAME, VENDOR_LIBRARY_NAME, dlerror());
-      return false;
-    }
+  lib_interface_ = reinterpret_cast<bt_vendor_interface_t*>(
+      dlsym(lib_handle_, VENDOR_LIBRARY_SYMBOL_NAME));
+  if (!lib_interface_) {
+    ALOGE("%s unable to find symbol %s in %s (%s)", __func__,
+          VENDOR_LIBRARY_SYMBOL_NAME, VENDOR_LIBRARY_NAME, dlerror());
+    return false;
+  }
 
   // Get the local BD address
 
-    uint8_t local_bda[BluetoothAddress::kBytes] = {0, 0, 0, 0, 0, 0};
-    if (!BluetoothAddress::get_local_address(local_bda)) {
-      // BT driver will get BD address from NVRAM for MTK solution
-      ALOGW("%s: No pre-set Bluetooth Address!", __func__);
-    }
-    int status = lib_interface_->init(&lib_callbacks, (unsigned char*)local_bda);
-    if (status) {
-      ALOGE("%s unable to initialize vendor library: %d", __func__, status);
-      return false;
-    }
+  uint8_t local_bda[BluetoothAddress::kBytes];
+  if (!BluetoothAddress::get_local_address(local_bda)) {
+    LOG_ALWAYS_FATAL("%s: No Bluetooth Address!", __func__);
+  }
+  int status = lib_interface_->init(&lib_callbacks, (unsigned char*)local_bda);
+  if (status) {
+    ALOGE("%s unable to initialize vendor library: %d", __func__, status);
+    return false;
+  }
 
-    ALOGD("%s vendor library loaded", __func__);
+  ALOGD("%s vendor library loaded", __func__);
 
   // Power on the controller
 
-    int power_state = BT_VND_PWR_ON;
-    lib_interface_->op(BT_VND_OP_POWER_CTRL, &power_state);
+  int power_state = BT_VND_PWR_ON;
+  lib_interface_->op(BT_VND_OP_POWER_CTRL, &power_state);
 
   // Get the UART socket(s)
 
-    int fd_list[CH_MAX] = {0};
-    int fd_count = lib_interface_->op(BT_VND_OP_USERIAL_OPEN, &fd_list);
+  int fd_list[CH_MAX] = {0};
+  int fd_count = lib_interface_->op(BT_VND_OP_USERIAL_OPEN, &fd_list);
 
-    if (fd_count < 1 || fd_count > CH_MAX - 1) {
-      ALOGE("%s: fd_count %d is invalid!", __func__, fd_count);
+  if (fd_count < 1 || fd_count > CH_MAX - 1) {
+    ALOGE("%s: fd_count %d is invalid!", __func__, fd_count);
+    return false;
+  }
+
+  for (int i = 0; i < fd_count; i++) {
+    if (fd_list[i] == INVALID_FD) {
+      ALOGE("%s: fd %d is invalid!", __func__, fd_list[i]);
       return false;
     }
+  }
 
-    for (int i = 0; i < fd_count; i++) {
-      if (fd_list[i] == INVALID_FD) {
-        ALOGE("%s: fd %d is invalid!", __func__, fd_list[i]);
-        return false;
-      }
-    }
+  event_cb_ = event_cb;
+  PacketReadCallback intercept_events = [this](const hidl_vec<uint8_t>& event) {
+    HandleIncomingEvent(event);
+  };
 
-    event_cb_ = event_cb;
-    PacketReadCallback intercept_events = [this](const hidl_vec<uint8_t>& event) {
-      HandleIncomingEvent(event);
-    };
-
-    if (fd_count == 1) {
-      hci::H4Protocol* h4_hci =
-          new hci::H4Protocol(fd_list[0], intercept_events, acl_cb, sco_cb, iso_cb);
-      fd_watcher_.WatchFdForNonBlockingReads(
-          fd_list[0], [h4_hci](int fd) { h4_hci->OnDataReady(fd); });
-      hci_ = h4_hci;
-    } else {
-      hci::MctProtocol* mct_hci =
-          new hci::MctProtocol(fd_list, intercept_events, acl_cb);
-      fd_watcher_.WatchFdForNonBlockingReads(
-          fd_list[CH_EVT], [mct_hci](int fd) { mct_hci->OnEventDataReady(fd); });
-      fd_watcher_.WatchFdForNonBlockingReads(
-          fd_list[CH_ACL_IN],
-          [mct_hci](int fd) { mct_hci->OnAclDataReady(fd); });
-      hci_ = mct_hci;
-    }
+  if (fd_count == 1) {
+    hci::H4Protocol* h4_hci =
+        new hci::H4Protocol(fd_list[0], intercept_events, acl_cb, sco_cb, iso_cb);
+    fd_watcher_.WatchFdForNonBlockingReads(
+        fd_list[0], [h4_hci](int fd) { h4_hci->OnDataReady(fd); });
+    hci_ = h4_hci;
+  } else {
+    hci::MctProtocol* mct_hci =
+        new hci::MctProtocol(fd_list, intercept_events, acl_cb);
+    fd_watcher_.WatchFdForNonBlockingReads(
+        fd_list[CH_EVT], [mct_hci](int fd) { mct_hci->OnEventDataReady(fd); });
+    fd_watcher_.WatchFdForNonBlockingReads(
+        fd_list[CH_ACL_IN], [mct_hci](int fd) { mct_hci->OnAclDataReady(fd); });
+    hci_ = mct_hci;
+  }
 
   // Initially, the power management is off.
-    lpm_wake_deasserted = true;
+  lpm_wake_deasserted = true;
 
   // Start configuring the firmware
-    firmware_startup_timer_ = new FirmwareStartupTimer();
-    lib_interface_->op(BT_VND_OP_FW_CFG, nullptr);
+  firmware_startup_timer_ = new FirmwareStartupTimer();
+  lib_interface_->op(BT_VND_OP_FW_CFG, nullptr);
 
-    vstate = VENDOR_STATE_OPENED;
-    ALOGI("%s: VendorInterface::Open done!!!", __func__);
-  }  // vendor_mutex_ done
   return true;
 }
 
 void VendorInterface::Close() {
   // These callbacks may send HCI events (vendor-dependent), so make sure to
   // StopWatching the file descriptor after this.
-
-  if (vstate != VENDOR_STATE_OPENED) {
-    ALOGW("VendorInterface is not allow close(%d)", vstate);
-    return;
-  }
-  vstate = VENDOR_STATE_CLOSING;
-  ALOGI("%s: VendorInterface::Close", __func__);
-
   if (lib_interface_ != nullptr) {
-    lib_interface_->cleanup();
     bt_vendor_lpm_mode_t mode = BT_VND_LPM_DISABLE;
     lib_interface_->op(BT_VND_OP_LPM_SET_MODE, &mode);
   }
 
-  {
-    std::unique_lock<std::mutex> guard(vendor_mutex_);
+  fd_watcher_.StopWatchingFileDescriptors();
 
-    fd_watcher_.StopWatchingFileDescriptors();
-    if (hci_ != nullptr) {
-      delete hci_;
-      hci_ = nullptr;
-    }
+  if (hci_ != nullptr) {
+    delete hci_;
+    hci_ = nullptr;
+  }
 
-    if (lib_interface_ != nullptr) {
-      lib_interface_->op(BT_VND_OP_USERIAL_CLOSE, nullptr);
+  if (lib_interface_ != nullptr) {
+    lib_interface_->op(BT_VND_OP_USERIAL_CLOSE, nullptr);
 
-      int power_state = BT_VND_PWR_OFF;
-      lib_interface_->op(BT_VND_OP_POWER_CTRL, &power_state);
+    int power_state = BT_VND_PWR_OFF;
+    lib_interface_->op(BT_VND_OP_POWER_CTRL, &power_state);
 
-      lib_interface_ = nullptr;
-    }
+    lib_interface_->cleanup();
+    lib_interface_ = nullptr;
+  }
 
-    if (lib_handle_ != nullptr) {
-      dlclose(lib_handle_);
-      lib_handle_ = nullptr;
-    }
+  if (lib_handle_ != nullptr) {
+    dlclose(lib_handle_);
+    lib_handle_ = nullptr;
+  }
 
-    if (firmware_startup_timer_ != nullptr) {
-      delete firmware_startup_timer_;
-      firmware_startup_timer_ = nullptr;
-    }
-    vstate = VENDOR_STATE_CLOSED;
-  }  // vendor_mutex_ done
-  ALOGI("%s: VendorInterface::Close done!!!", __func__);
+  if (firmware_startup_timer_ != nullptr) {
+    delete firmware_startup_timer_;
+    firmware_startup_timer_ = nullptr;
+  }
 }
 
 size_t VendorInterface::Send(uint8_t type, const uint8_t* data, size_t length) {
-  {
-    std::unique_lock<std::mutex> guard(vendor_mutex_);
+  std::unique_lock<std::mutex> lock(wakeup_mutex_);
+  recent_activity_flag = true;
 
-    if (vstate != VENDOR_STATE_OPENED) {
-      ALOGW("VendorInterface is not open yet(%d)!", vstate);
-      return 0;
-    }
-    ALOGI("%s: VendorInterface::Send", __func__);
-
-    if (lib_interface_ == nullptr) {
-      ALOGE("lib_interface_ is null");
-      return 0;
-    }
-    recent_activity_flag = true;
-    if (lpm_wake_deasserted == true) {
-      // Restart the timer.
-      fd_watcher_.ConfigureTimeout(std::chrono::milliseconds(lpm_timeout_ms),
+  if (lpm_wake_deasserted == true) {
+    // Restart the timer.
+    fd_watcher_.ConfigureTimeout(std::chrono::milliseconds(lpm_timeout_ms),
                                  [this]() { OnTimeout(); });
-      // Assert wake.
-      lpm_wake_deasserted = false;
-      bt_vendor_lpm_wake_state_t wakeState = BT_VND_LPM_WAKE_ASSERT;
-      lib_interface_->op(BT_VND_OP_LPM_WAKE_SET_STATE, &wakeState);
-      ALOGV("%s: Sent wake before (%02x)", __func__, data[0] | (data[1] << 8));
-    }
+    // Assert wake.
+    lpm_wake_deasserted = false;
+    bt_vendor_lpm_wake_state_t wakeState = BT_VND_LPM_WAKE_ASSERT;
+    lib_interface_->op(BT_VND_OP_LPM_WAKE_SET_STATE, &wakeState);
+    ALOGV("%s: Sent wake before (%02x)", __func__, data[0] | (data[1] << 8));
+  }
 
-    return hci_ ? hci_->Send(type, data, length) : 0;
-  }  // vendor_mutex_ done
+  return hci_->Send(type, data, length);
 }
 
 void VendorInterface::OnFirmwareConfigured(uint8_t result) {
@@ -394,36 +339,25 @@
     firmware_startup_timer_ = nullptr;
   }
 
-  {
-    std::unique_lock<std::mutex> guard(initcb_mutex_);
-    ALOGD("%s OnFirmwareConfigured get lock", __func__);
-    if (initialize_complete_cb_ != nullptr) {
-      LOG_ALWAYS_FATAL_IF((result != 0),
-          "%s: Failed to init firmware!", __func__);
-      initialize_complete_cb_(result == 0);
-    }
-  }  // initcb_mutex_ done
-
-  if (lib_interface_ != nullptr) {
-    lib_interface_->op(BT_VND_OP_GET_LPM_IDLE_TIMEOUT, &lpm_timeout_ms);
-    ALOGI("%s: lpm_timeout_ms %d", __func__, lpm_timeout_ms);
-
-    bt_vendor_lpm_mode_t mode = BT_VND_LPM_ENABLE;
-    lib_interface_->op(BT_VND_OP_LPM_SET_MODE, &mode);
-
-    ALOGD("%s Calling StartLowPowerWatchdog()", __func__);
-    fd_watcher_.ConfigureTimeout(std::chrono::milliseconds(lpm_timeout_ms),
-                                 [this]() { OnTimeout(); });
-  }
-  else {
-    ALOGE("lib_interface_ is null");
+  if (initialize_complete_cb_ != nullptr) {
+    initialize_complete_cb_(result == 0);
+    initialize_complete_cb_ = nullptr;
   }
 
-  initialize_complete_cb_ = nullptr;
+  lib_interface_->op(BT_VND_OP_GET_LPM_IDLE_TIMEOUT, &lpm_timeout_ms);
+  ALOGI("%s: lpm_timeout_ms %d", __func__, lpm_timeout_ms);
+
+  bt_vendor_lpm_mode_t mode = BT_VND_LPM_ENABLE;
+  lib_interface_->op(BT_VND_OP_LPM_SET_MODE, &mode);
+
+  ALOGD("%s Calling StartLowPowerWatchdog()", __func__);
+  fd_watcher_.ConfigureTimeout(std::chrono::milliseconds(lpm_timeout_ms),
+                               [this]() { OnTimeout(); });
 }
 
 void VendorInterface::OnTimeout() {
   ALOGV("%s", __func__);
+  std::unique_lock<std::mutex> lock(wakeup_mutex_);
   if (recent_activity_flag == false) {
     lpm_wake_deasserted = true;
     bt_vendor_lpm_wake_state_t wakeState = BT_VND_LPM_WAKE_DEASSERT;
diff --git a/bluetooth/1.0/default/vendor_interface.h b/bluetooth/1.0/default/vendor_interface.h
index 2df3946..040f31a 100644
--- a/bluetooth/1.0/default/vendor_interface.h
+++ b/bluetooth/1.0/default/vendor_interface.h
@@ -22,8 +22,6 @@
 #include "bt_vendor_lib.h"
 #include "hci_protocol.h"
 
-extern std::mutex initcb_mutex_;
-
 namespace android {
 namespace hardware {
 namespace bluetooth {
@@ -47,9 +45,10 @@
   size_t Send(uint8_t type, const uint8_t* data, size_t length);
 
   void OnFirmwareConfigured(uint8_t result);
-  virtual ~VendorInterface() = default;
 
  private:
+  virtual ~VendorInterface() = default;
+
   bool Open(InitializeCompleteCallback initialize_complete_cb,
             PacketReadCallback event_cb, PacketReadCallback acl_cb,
             PacketReadCallback sco_cb, PacketReadCallback iso_cb);