dinput: GetDeviceData always succeeds regardless if buffering is enabled or device is acquired.

dlls/dinput/device.c

@@ -1286,10 +1286,8 @@ HRESULT WINAPI IDirectInputDevice2WImpl_GetDeviceData(LPDIRECTINPUTDEVICE8W ifac
     TRACE("(%p) %p -> %p(%d) x%d, 0x%08x\n",
           This, dod, entries, entries ? *entries : 0, dodsize, flags);
 
-    if (!This->acquired)
-        return DIERR_NOTACQUIRED;
     if (!This->queue_len)
-        return DIERR_NOTBUFFERED;
+        return DI_OK;
     if (dodsize < sizeof(DIDEVICEOBJECTDATA_DX3))
         return DIERR_INVALIDPARAM;
 

dlls/dinput/tests/device.c

@@ -103,6 +103,9 @@ static void test_object_info(LPDIRECTINPUTDEVICE device, HWND hwnd)
     hr = IDirectInputDevice_GetObjectInfo(device, &obj_info, 16, DIPH_BYOFFSET);
     if (SUCCEEDED(hr))
     {
+        DWORD cnt;
+        DIDEVICEOBJECTDATA buffer[5];
+
         /* No device supports per axis relative/absolute mode */
         memset(&dp, 0, sizeof(dp));
         dp.diph.dwSize = sizeof(DIPROPDWORD);
@@ -119,9 +122,28 @@ static void test_object_info(LPDIRECTINPUTDEVICE device, HWND hwnd)
         hr = IDirectInputDevice_SetProperty(device, DIPROP_AXISMODE, &dp.diph);
         ok(hr == DI_OK, "SetProperty() failed: %08x\n", hr);
 
+        dp.dwData = 0;
+        hr = IDirectInputDevice_SetProperty(device, DIPROP_BUFFERSIZE, (LPCDIPROPHEADER)&dp.diph);
+        ok(hr == DI_OK, "SetProperty() failed: %08x\n", hr);
+
+        cnt = 5;
+        hr = IDirectInputDevice_GetDeviceData(device, sizeof(buffer), buffer, &cnt, 0);
+        ok(hr == DI_OK && cnt == 5, "GetDeviceData() failed: %08x cnt: %d\n", hr, cnt);
+
+        dp.dwData = 20;
+        hr = IDirectInputDevice_SetProperty(device, DIPROP_BUFFERSIZE, (LPCDIPROPHEADER)&dp.diph);
+        ok(hr == DI_OK, "SetProperty() failed: %08x\n", hr);
+
+        cnt = 1;
+        hr = IDirectInputDevice_GetDeviceData(device, sizeof(buffer), buffer, &cnt, 0);
+        ok(hr == DI_OK, "GetDeviceData() failed: %08x\n", hr);
+
         /* Cannot change mode while acquired */
         hr = IDirectInputDevice_Acquire(device);
         ok(hr == DI_OK, "Acquire() failed: %08x\n", hr);
+        cnt = 1;
+        hr = IDirectInputDevice_GetDeviceData(device, sizeof(buffer), buffer, &cnt, 0);
+        ok(hr == DI_OK, "GetDeviceData() failed: %08x\n", hr);
         hr = IDirectInputDevice_SetProperty(device, DIPROP_AXISMODE, &dp.diph);
         ok(hr == DIERR_ACQUIRED, "SetProperty() returned: %08x\n", hr);
         hr = IDirectInputDevice_Unacquire(device);