Re: [PATCH v4 05/21] media: rkisp1: params: Fix and simplify (un)registration

[Ricardo Ribalda <ribalda@xxxxxxxxxxxx>]

Laurent Pinchart wrote:

> The rkisp1_params_register() and rkisp1_params_unregister() functions
> don't destroy the mutex (in the error path for the former). Fix this,
> simplify error handling at registration time as media_entity_cleanup()
> can be called on an uninitialized entity, and make
> rkisp1_params_unregister() safe to be called on an unregistered params
> node to prepare for simplification of error handling at probe time.
> 
> Signed-off-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
Reviewed-by: Ricardo Ribalda <ribalda@xxxxxxxxxxxx>
> ---
> Changes since v3:
> 
> - Use video_is_registered() for registration test
> ---
>  .../media/platform/rockchip/rkisp1/rkisp1-params.c | 14 +++++++++++---
>  1 file changed, 11 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/media/platform/rockchip/rkisp1/rkisp1-params.c b/drivers/media/platform/rockchip/rkisp1/rkisp1-params.c
> index 8f62f09e635f..f6da2571b55f 100644
> --- a/drivers/media/platform/rockchip/rkisp1/rkisp1-params.c
> +++ b/drivers/media/platform/rockchip/rkisp1/rkisp1-params.c
> @@ -1844,16 +1844,20 @@ int rkisp1_params_register(struct rkisp1_device *rkisp1)
>  	node->pad.flags = MEDIA_PAD_FL_SOURCE;
>  	ret = media_entity_pads_init(&vdev->entity, 1, &node->pad);
>  	if (ret)
> -		return ret;
> +		goto error;
> +
>  	ret = video_register_device(vdev, VFL_TYPE_VIDEO, -1);
>  	if (ret) {
>  		dev_err(rkisp1->dev,
>  			"failed to register %s, ret=%d\n", vdev->name, ret);
> -		goto err_cleanup_media_entity;
> +		goto error;
>  	}
> +
>  	return 0;
> -err_cleanup_media_entity:
> +
> +error:
>  	media_entity_cleanup(&vdev->entity);
> +	mutex_destroy(&node->vlock);
>  	return ret;
>  }
>  
> @@ -1863,6 +1867,10 @@ void rkisp1_params_unregister(struct rkisp1_device *rkisp1)
>  	struct rkisp1_vdev_node *node = &params->vnode;
>  	struct video_device *vdev = &node->vdev;
>  
> +	if (!video_is_registered(vdev))
> +		return;
> +
>  	vb2_video_unregister_device(vdev);
>  	media_entity_cleanup(&vdev->entity);
> +	mutex_destroy(&node->vlock);
>  }
> -- 
> Regards,
> 
> Laurent Pinchart
> 
>