diff --git a/services/surfaceflinger/DisplayHardware/PowerAdvisor.cpp b/services/surfaceflinger/DisplayHardware/PowerAdvisor.cpp
index 1d8179c..4b4c050 100644
--- a/services/surfaceflinger/DisplayHardware/PowerAdvisor.cpp
+++ b/services/surfaceflinger/DisplayHardware/PowerAdvisor.cpp
@@ -85,6 +85,7 @@
 
     const bool expectsExpensiveRendering = !mExpensiveDisplays.empty();
     if (mNotifiedExpensiveRendering != expectsExpensiveRendering) {
+        std::lock_guard lock(mPowerHalMutex);
         HalWrapper* const halWrapper = getPowerHal();
         if (halWrapper == nullptr) {
             return;
@@ -108,6 +109,7 @@
     }
 
     if (mSendUpdateImminent.load()) {
+        std::lock_guard lock(mPowerHalMutex);
         HalWrapper* const halWrapper = getPowerHal();
         if (halWrapper == nullptr) {
             return;
diff --git a/services/surfaceflinger/DisplayHardware/PowerAdvisor.h b/services/surfaceflinger/DisplayHardware/PowerAdvisor.h
index 34e63e7..95eb0e2 100644
--- a/services/surfaceflinger/DisplayHardware/PowerAdvisor.h
+++ b/services/surfaceflinger/DisplayHardware/PowerAdvisor.h
@@ -19,6 +19,8 @@
 #include <atomic>
 #include <unordered_set>
 
+#include <utils/Mutex.h>
+
 #include "../Scheduler/OneShotTimer.h"
 #include "DisplayIdentification.h"
 
@@ -56,10 +58,11 @@
     void notifyDisplayUpdateImminent() override;
 
 private:
-    HalWrapper* getPowerHal();
+    HalWrapper* getPowerHal() REQUIRES(mPowerHalMutex);
+    bool mReconnectPowerHal GUARDED_BY(mPowerHalMutex) = false;
+    std::mutex mPowerHalMutex;
 
     std::atomic_bool mBootFinished = false;
-    bool mReconnectPowerHal = false;
 
     std::unordered_set<DisplayId> mExpensiveDisplays;
     bool mNotifiedExpensiveRendering = false;