Linux Virtualization - Mar 2023 - [PATCH v1] drm/virtio: Fix handling CONFIG_DRM_VIRTIO_GPU_KMS option

> +++ b/drivers/gpu/drm/virtio/virtgpu_kms.c
> @@ -45,9 +45,11 @@ static void virtio_gpu_config_changed_work_func(struct
work_struct *work)
>  	if (events_read & VIRTIO_GPU_EVENT_DISPLAY) {
>  		if (vgdev->has_edid)
>  			virtio_gpu_cmd_get_edids(vgdev);
> -		virtio_gpu_cmd_get_display_info(vgdev);
> -		virtio_gpu_notify(vgdev);
> -		drm_helper_hpd_irq_event(vgdev->ddev);
> +		if (vgdev->num_scanouts) {
> +			virtio_gpu_cmd_get_display_info(vgdev);
> +			virtio_gpu_notify(vgdev);
> +			drm_helper_hpd_irq_event(vgdev->ddev);
> +		}
I'd suggest to make the edid lines conditional too.
> -	if (IS_ENABLED(CONFIG_DRM_VIRTIO_GPU_KMS) || !vgdev->num_scanouts) {
> +	if (!IS_ENABLED(CONFIG_DRM_VIRTIO_GPU_KMS) || !vgdev->num_scanouts) {
>  		DRM_INFO("KMS disabled\n");
>  		vgdev->num_scanouts = 0;
>  		vgdev->has_edid = false;
Doesn't make a difference because has_edid gets set to false here,
but IMHO it is less confusing that way.

take care,
  Gerd