1 files changed, 21 insertions, 11 deletions
diff --git a/src/bluetooth/qbluetoothdevicediscoveryagent_winrt.cpp b/src/bluetooth/qbluetoothdevicediscoveryagent_winrt.cpp
index 66834827..82a2ebbc 100644
--- a/src/bluetooth/qbluetoothdevicediscoveryagent_winrt.cpp
+++ b/src/bluetooth/qbluetoothdevicediscoveryagent_winrt.cpp
@@ -157,6 +157,8 @@ private:
 #endif
     HRESULT onBluetoothLEAdvertisementReceived(IBluetoothLEAdvertisementReceivedEventArgs *args);
 
+    void decrementPairedDevicesAndCheckFinished();
+
 public slots:
     void finishDiscovery();
 
@@ -492,10 +494,7 @@ void QWinRTBluetoothDeviceDiscoveryWorker::classicBluetoothInfoFromDeviceIdAsync
         // on Windows 10 FromIdAsync might ask for device permission. We cannot wait here but have to handle that asynchronously
         HRESULT hr = m_deviceStatics->FromIdAsync(deviceId, &deviceFromIdOperation);
         if (FAILED(hr)) {
-            --m_pendingPairedDevices;
-            if (!m_pendingPairedDevices
-                    && !(requestedModes & QBluetoothDeviceDiscoveryAgent::LowEnergyMethod))
-                finishDiscovery();
+            decrementPairedDevicesAndCheckFinished();
             qCWarning(QT_BT_WINRT) << "Could not obtain bluetooth device from id";
             return S_OK;
         }
@@ -506,15 +505,13 @@ void QWinRTBluetoothDeviceDiscoveryWorker::classicBluetoothInfoFromDeviceIdAsync
             if (thisPointer) {
                 if (status == Completed)
                     thisPointer->onPairedClassicBluetoothDeviceFoundAsync(op, status);
-                --thisPointer->m_pendingPairedDevices;
+                else
+                    thisPointer->decrementPairedDevicesAndCheckFinished();
             }
             return S_OK;
         }).Get());
         if (FAILED(hr)) {
-            --m_pendingPairedDevices;
-            if (!m_pendingPairedDevices
-                    && !(requestedModes & QBluetoothDeviceDiscoveryAgent::LowEnergyMethod))
-                finishDiscovery();
+            decrementPairedDevicesAndCheckFinished();
             qCWarning(QT_BT_WINRT) << "Could not register device found callback";
             return S_OK;
         }
@@ -522,7 +519,7 @@ void QWinRTBluetoothDeviceDiscoveryWorker::classicBluetoothInfoFromDeviceIdAsync
     });
     if (FAILED(hr)) {
         emit errorOccured(QBluetoothDeviceDiscoveryAgent::UnknownError);
-        --m_pendingPairedDevices;
+        decrementPairedDevicesAndCheckFinished();
         qCWarning(QT_BT_WINRT) << "Could not obtain bluetooth device from id";
         return;
     }
@@ -531,6 +528,10 @@ void QWinRTBluetoothDeviceDiscoveryWorker::classicBluetoothInfoFromDeviceIdAsync
 // "deviceFound" will be emitted at the end of the deviceFromIdOperation callback
 void QWinRTBluetoothDeviceDiscoveryWorker::leBluetoothInfoFromDeviceIdAsync(HSTRING deviceId)
 {
+    // Note: in this method we do not need to call
+    // decrementPairedDevicesAndCheckFinished() because we *do* run LE
+    // scanning, so the condition in the check will always be false.
+    // It's enough to just decrement m_pendingPairedDevices.
     HRESULT hr;
     hr = QEventDispatcherWinRT::runOnXamlThread([deviceId, this]() {
         ComPtr<IAsyncOperation<BluetoothLEDevice *>> deviceFromIdOperation;
@@ -548,7 +549,8 @@ void QWinRTBluetoothDeviceDiscoveryWorker::leBluetoothInfoFromDeviceIdAsync(HSTR
             if (thisPointer) {
                 if (status == Completed)
                     thisPointer->onPairedBluetoothLEDeviceFoundAsync(op, status);
-                --thisPointer->m_pendingPairedDevices;
+                else
+                    --thisPointer->m_pendingPairedDevices;
             }
             return S_OK;
         }).Get());
@@ -687,6 +689,14 @@ HRESULT QWinRTBluetoothDeviceDiscoveryWorker::onPairedClassicBluetoothDeviceFoun
     return S_OK;
 }
 
+void QWinRTBluetoothDeviceDiscoveryWorker::decrementPairedDevicesAndCheckFinished()
+{
+    if ((--m_pendingPairedDevices == 0)
+        && !(requestedModes & QBluetoothDeviceDiscoveryAgent::LowEnergyMethod)) {
+        finishDiscovery();
+    }
+}
+
 HRESULT QWinRTBluetoothDeviceDiscoveryWorker::onPairedBluetoothLEDeviceFoundAsync(IAsyncOperation<BluetoothLEDevice *> *op, AsyncStatus status)
 {
     --m_pendingPairedDevices;