drm/virtio: make sure context is created in gem open

The context might still be missing when DRM_IOCTL_PRIME_FD_TO_HANDLE is
the first ioctl on the drm_file.

Fixes: 72b48ae8 ("drm/virtio: enqueue virtio_gpu_create_context after the first 3D ioctl")
Cc: Gurchetan Singh <gurchetansingh@chromium.org>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: NChia-I Wu <olvaffe@gmail.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20210107210726.269584-1-olvaffe@gmail.comReviewed-by: NGurchetan Singh <gurchetansingh@chromium.org>
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>

drivers/gpu/drm/virtio/virtgpu_gem.c

@@ -39,9 +39,6 @@ static int virtio_gpu_gem_create(struct drm_file *file,
 	int ret;
 	u32 handle;
 
-	if (vgdev->has_virgl_3d)
-		virtio_gpu_create_context(dev, file);
-
 	ret = virtio_gpu_object_create(vgdev, params, &obj, NULL);
 	if (ret < 0)
 		return ret;
@@ -119,6 +116,11 @@ int virtio_gpu_gem_object_open(struct drm_gem_object *obj,
 	if (!vgdev->has_virgl_3d)
 		goto out_notify;
 
+	/* the context might still be missing when the first ioctl is
+	 * DRM_IOCTL_MODE_CREATE_DUMB or DRM_IOCTL_PRIME_FD_TO_HANDLE
+	 */
+	virtio_gpu_create_context(obj->dev, file);
+
 	objs = virtio_gpu_array_alloc(1);
 	if (!objs)
 		return -ENOMEM;