core: barrier service thread shutdown

src/core/hle/service/nvflinger/nvflinger.cpp

@@ -102,15 +102,19 @@ NVFlinger::~NVFlinger() {
         system.CoreTiming().UnscheduleEvent(single_composition_event, {});
     }
 
+    ShutdownLayers();
+
+    if (nvdrv) {
+        nvdrv->Close(disp_fd);
+    }
+}
+
+void NVFlinger::ShutdownLayers() {
     for (auto& display : displays) {
         for (size_t layer = 0; layer < display.GetNumLayers(); ++layer) {
             display.GetLayer(layer).Core().NotifyShutdown();
         }
     }
-
-    if (nvdrv) {
-        nvdrv->Close(disp_fd);
-    }
 }
 
 void NVFlinger::SetNVDrvInstance(std::shared_ptr<Nvidia::Module> instance) {

src/core/hle/service/nvflinger/nvflinger.h

@@ -48,6 +48,8 @@ public:
     explicit NVFlinger(Core::System& system_, HosBinderDriverServer& hos_binder_driver_server_);
     ~NVFlinger();
 
+    void ShutdownLayers();
+
     /// Sets the NVDrv module instance to use to send buffers to the GPU.
     void SetNVDrvInstance(std::shared_ptr<Nvidia::Module> instance);