Log warnings when LibusbUtils::GetDeviceList fails

Source/Core/Core/IOS/USB/Bluetooth/BTReal.cpp

@@ -84,7 +84,7 @@ std::optional<IPCReply> BluetoothRealDevice::Open(const OpenRequest& request)
     return IPCReply(IPC_EACCES);
 
   m_last_open_error.clear();
-  m_context.GetDeviceList([this](libusb_device* device) {
+  const int ret = m_context.GetDeviceList([this](libusb_device* device) {
     libusb_device_descriptor device_descriptor;
     libusb_get_device_descriptor(device, &device_descriptor);
     auto config_descriptor = LibusbUtils::MakeConfigDescriptor(device);
@@ -116,6 +116,11 @@ std::optional<IPCReply> BluetoothRealDevice::Open(const OpenRequest& request)
     }
     return true;
   });
+  if (ret != LIBUSB_SUCCESS)
+  {
+    m_last_open_error =
+        Common::FmtFormatT("GetDeviceList failed: {0}", LibusbUtils::ErrorWrap(ret));
+  }
 
   if (m_handle == nullptr)
   {

Source/Core/Core/IOS/USB/Host.cpp

@@ -121,7 +121,7 @@ bool USBHost::AddNewDevices(std::set<u64>& new_devices, DeviceChangeHooks& hooks
 
   if (m_context.IsValid())
   {
-    m_context.GetDeviceList([&](libusb_device* device) {
+    const int ret = m_context.GetDeviceList([&](libusb_device* device) {
       libusb_device_descriptor descriptor;
       libusb_get_device_descriptor(device, &descriptor);
       if (whitelist.count({descriptor.idVendor, descriptor.idProduct}) == 0)
@@ -137,6 +137,8 @@ bool USBHost::AddNewDevices(std::set<u64>& new_devices, DeviceChangeHooks& hooks
         hooks.emplace(GetDeviceById(id), ChangeEvent::Inserted);
       return true;
     });
+    if (ret != LIBUSB_SUCCESS)
+      WARN_LOG_FMT(IOS_USB, "GetDeviceList failed: {}", LibusbUtils::ErrorWrap(ret));
   }
 #endif
   return true;

Source/Core/Core/LibusbUtils.cpp

@@ -47,16 +47,16 @@ public:
     libusb_exit(m_context);
   }
 
-  libusb_context* GetContext() { return m_context; }
+  libusb_context* GetContext() const { return m_context; }
 
-  bool GetDeviceList(GetDeviceListCallback callback)
+  int GetDeviceList(GetDeviceListCallback callback) const
   {
     std::lock_guard lock{m_device_list_mutex};
 
     libusb_device** list;
     ssize_t count = libusb_get_device_list(m_context, &list);
     if (count < 0)
-      return false;
+      return static_cast<int>(count);
 
     for (ssize_t i = 0; i < count; ++i)
     {
@@ -64,7 +64,7 @@ public:
         break;
     }
     libusb_free_device_list(list, 1);
-    return true;
+    return LIBUSB_SUCCESS;
   }
 
 private:
@@ -81,7 +81,7 @@ private:
   }
 
   libusb_context* m_context = nullptr;
-  std::mutex m_device_list_mutex;
+  mutable std::mutex m_device_list_mutex;
   Common::Flag m_event_thread_running;
   std::thread m_event_thread;
 };
@@ -89,8 +89,8 @@ private:
 class Context::Impl
 {
 public:
-  libusb_context* GetContext() { return nullptr; }
+  libusb_context* GetContext() const { return nullptr; }
-  bool GetDeviceList(GetDeviceListCallback callback) { return false; }
+  int GetDeviceList(GetDeviceListCallback callback) const { return -1; }
 };
 #endif
 
@@ -110,7 +110,7 @@ bool Context::IsValid() const
   return m_impl->GetContext() != nullptr;
 }
 
-bool Context::GetDeviceList(GetDeviceListCallback callback)
+int Context::GetDeviceList(GetDeviceListCallback callback) const
 {
   return m_impl->GetDeviceList(std::move(callback));
 }

Source/Core/Core/LibusbUtils.h

@@ -31,7 +31,7 @@ public:
   bool IsValid() const;
 
   // Only valid if the context is valid.
-  bool GetDeviceList(GetDeviceListCallback callback);
+  int GetDeviceList(GetDeviceListCallback callback) const;
 
 private:
   class Impl;

Source/Core/InputCommon/GCAdapter.cpp

@@ -462,7 +462,7 @@ static void Setup()
   s_controller_type.fill(ControllerType::None);
   s_controller_rumble.fill(0);
 
-  s_libusb_context->GetDeviceList([](libusb_device* device) {
+  const int ret = s_libusb_context->GetDeviceList([](libusb_device* device) {
     if (CheckDeviceAccess(device))
     {
       // Only connect to a single adapter in case the user has multiple connected
@@ -471,6 +471,8 @@ static void Setup()
     }
     return true;
   });
+  if (ret != LIBUSB_SUCCESS)
+    WARN_LOG_FMT(CONTROLLERINTERFACE, "Failed to get device list: {}", LibusbUtils::ErrorWrap(ret));
 
   if (s_status != ADAPTER_DETECTED && prev_status != s_status && s_detect_callback != nullptr)
     s_detect_callback();

Source/Core/UICommon/USBUtils.cpp

@@ -11,6 +11,7 @@
 #endif
 
 #include "Common/CommonTypes.h"
+#include "Common/Logging/Log.h"
 #include "Core/LibusbUtils.h"
 
 // Because opening and getting the device name from devices is slow, especially on Windows
@@ -45,13 +46,15 @@ std::map<std::pair<u16, u16>, std::string> GetInsertedDevices()
   if (!context.IsValid())
     return devices;
 
-  context.GetDeviceList([&](libusb_device* device) {
+  const int ret = context.GetDeviceList([&](libusb_device* device) {
     libusb_device_descriptor descr;
     libusb_get_device_descriptor(device, &descr);
     const std::pair<u16, u16> vid_pid{descr.idVendor, descr.idProduct};
     devices[vid_pid] = GetDeviceName(vid_pid);
     return true;
   });
+  if (ret != LIBUSB_SUCCESS)
+    WARN_LOG_FMT(COMMON, "GetDeviceList failed: {}", LibusbUtils::ErrorWrap(ret));
 #endif
 
   return devices;