diff --git a/dlls/d3d9/device.c b/dlls/d3d9/device.c
index da462b1a6c6..97c71bb7ace 100644
--- a/dlls/d3d9/device.c
+++ b/dlls/d3d9/device.c
@@ -626,21 +626,28 @@ static HRESULT CDECL reset_enum_callback(struct wined3d_resource *resource)
     return D3D_OK;
 }
 
-static HRESULT WINAPI DECLSPEC_HOTPATCH d3d9_device_Reset(IDirect3DDevice9Ex *iface,
-        D3DPRESENT_PARAMETERS *present_parameters)
+static HRESULT d3d9_device_reset(struct d3d9_device *device,
+        D3DPRESENT_PARAMETERS *present_parameters, D3DDISPLAYMODEEX *mode)
 {
-    struct d3d9_device *device = impl_from_IDirect3DDevice9Ex(iface);
     struct wined3d_swapchain_desc swapchain_desc;
+    struct wined3d_display_mode wined3d_mode;
     HRESULT hr;
 
-    TRACE("iface %p, present_parameters %p.\n", iface, present_parameters);
-
     if (!device->d3d_parent->extended && device->device_state == D3D9_DEVICE_STATE_LOST)
     {
         WARN("App not active, returning D3DERR_DEVICELOST.\n");
         return D3DERR_DEVICELOST;
     }
 
+    if (mode)
+    {
+        wined3d_mode.width = mode->Width;
+        wined3d_mode.height = mode->Height;
+        wined3d_mode.refresh_rate = mode->RefreshRate;
+        wined3d_mode.format_id = wined3dformat_from_d3dformat(mode->Format);
+        wined3d_mode.scanline_ordering = mode->ScanLineOrdering;
+    }
+
     wined3d_mutex_lock();
 
     if (device->vertex_buffer)
@@ -649,6 +656,7 @@ static HRESULT WINAPI DECLSPEC_HOTPATCH d3d9_device_Reset(IDirect3DDevice9Ex *if
         device->vertex_buffer = NULL;
         device->vertex_buffer_size = 0;
     }
+
     if (device->index_buffer)
     {
         wined3d_buffer_decref(device->index_buffer);
@@ -657,17 +665,27 @@ static HRESULT WINAPI DECLSPEC_HOTPATCH d3d9_device_Reset(IDirect3DDevice9Ex *if
     }
 
     wined3d_swapchain_desc_from_present_parameters(&swapchain_desc, present_parameters);
-    hr = wined3d_device_reset(device->wined3d_device, &swapchain_desc,
-            NULL, reset_enum_callback, !device->d3d_parent->extended);
-    if (FAILED(hr) && !device->d3d_parent->extended)
-        device->device_state = D3D9_DEVICE_STATE_NOT_RESET;
-    else
+    if (SUCCEEDED(hr = wined3d_device_reset(device->wined3d_device, &swapchain_desc,
+            mode ? &wined3d_mode : NULL, reset_enum_callback, !device->d3d_parent->extended)))
         device->device_state = D3D9_DEVICE_STATE_OK;
+    else if (!device->d3d_parent->extended)
+        device->device_state = D3D9_DEVICE_STATE_NOT_RESET;
+
     wined3d_mutex_unlock();
 
     return hr;
 }
 
+static HRESULT WINAPI DECLSPEC_HOTPATCH d3d9_device_Reset(IDirect3DDevice9Ex *iface,
+        D3DPRESENT_PARAMETERS *present_parameters)
+{
+    struct d3d9_device *device = impl_from_IDirect3DDevice9Ex(iface);
+
+    TRACE("iface %p, present_parameters %p.\n", iface, present_parameters);
+
+    return d3d9_device_reset(device, present_parameters, NULL);
+}
+
 static HRESULT WINAPI DECLSPEC_HOTPATCH d3d9_device_Present(IDirect3DDevice9Ex *iface,
         const RECT *src_rect, const RECT *dst_rect, HWND dst_window_override, const RGNDATA *dirty_region)
 {
@@ -3253,42 +3271,10 @@ static HRESULT WINAPI DECLSPEC_HOTPATCH d3d9_device_ResetEx(IDirect3DDevice9Ex *
         D3DPRESENT_PARAMETERS *present_parameters, D3DDISPLAYMODEEX *mode)
 {
     struct d3d9_device *device = impl_from_IDirect3DDevice9Ex(iface);
-    struct wined3d_swapchain_desc swapchain_desc;
-    struct wined3d_display_mode wined3d_mode;
-    HRESULT hr;
 
     TRACE("iface %p, present_parameters %p, mode %p.\n", iface, present_parameters, mode);
 
-    if (mode)
-    {
-        wined3d_mode.width = mode->Width;
-        wined3d_mode.height = mode->Height;
-        wined3d_mode.refresh_rate = mode->RefreshRate;
-        wined3d_mode.format_id = wined3dformat_from_d3dformat(mode->Format);
-        wined3d_mode.scanline_ordering = mode->ScanLineOrdering;
-    }
-
-    wined3d_mutex_lock();
-
-    if (device->vertex_buffer)
-    {
-        wined3d_buffer_decref(device->vertex_buffer);
-        device->vertex_buffer = NULL;
-        device->vertex_buffer_size = 0;
-    }
-    if (device->index_buffer)
-    {
-        wined3d_buffer_decref(device->index_buffer);
-        device->index_buffer = NULL;
-        device->index_buffer_size = 0;
-    }
-
-    wined3d_swapchain_desc_from_present_parameters(&swapchain_desc, present_parameters);
-    hr = wined3d_device_reset(device->wined3d_device, &swapchain_desc,
-            mode ? &wined3d_mode : NULL, reset_enum_callback, FALSE);
-    wined3d_mutex_unlock();
-
-    return hr;
+    return d3d9_device_reset(device, present_parameters, mode);
 }
 
 static HRESULT WINAPI d3d9_device_GetDisplayModeEx(IDirect3DDevice9Ex *iface,