[PATCH v4 04/21] media: rkisp1: resizer: Fix and simplify (un)registration

[Ricardo Ribalda]

Laurent Pinchart wrote:

> The rkisp1_rsz_register() and rkisp1_rsz_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_rsz_unregister() and
> rkisp1_resizer_devs_unregister() safe to be called on an unregistered
> resizer subdev to prepare for simplification of error handling at probe
> time.
> 
> Signed-off-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
> Reviewed-by: Dafna Hirschfeld <dafna at fastmail.com>
Reviewed-by: Ricardo Ribalda <ribalda at chromium.org>
> ---
> Changes since v1:
> 
> - Reset rsz->rkisp1 in rkisp1_resizer_devs_register()
> ---
>  .../platform/rockchip/rkisp1/rkisp1-resizer.c | 34 +++++++++----------
>  1 file changed, 17 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/media/platform/rockchip/rkisp1/rkisp1-resizer.c b/drivers/media/platform/rockchip/rkisp1/rkisp1-resizer.c
> index 2070f4b06705..df2beee1be99 100644
> --- a/drivers/media/platform/rockchip/rkisp1/rkisp1-resizer.c
> +++ b/drivers/media/platform/rockchip/rkisp1/rkisp1-resizer.c
> @@ -782,8 +782,12 @@ static const struct v4l2_subdev_ops rkisp1_rsz_ops = {
>  
>  static void rkisp1_rsz_unregister(struct rkisp1_resizer *rsz)
>  {
> +	if (!rsz->rkisp1)
> +		return;
> +
>  	v4l2_device_unregister_subdev(&rsz->sd);
>  	media_entity_cleanup(&rsz->sd.entity);
> +	mutex_destroy(&rsz->ops_lock);
>  }
>  
>  static int rkisp1_rsz_register(struct rkisp1_resizer *rsz)
> @@ -821,47 +825,43 @@ static int rkisp1_rsz_register(struct rkisp1_resizer *rsz)
>  	mutex_init(&rsz->ops_lock);
>  	ret = media_entity_pads_init(&sd->entity, RKISP1_RSZ_PAD_MAX, pads);
>  	if (ret)
> -		return ret;
> +		goto error;
>  
>  	ret = v4l2_device_register_subdev(&rsz->rkisp1->v4l2_dev, sd);
>  	if (ret) {
>  		dev_err(sd->dev, "Failed to register resizer subdev\n");
> -		goto err_cleanup_media_entity;
> +		goto error;
>  	}
>  
>  	rkisp1_rsz_init_config(sd, &state);
>  	return 0;
>  
> -err_cleanup_media_entity:
> +error:
>  	media_entity_cleanup(&sd->entity);
> -
> +	mutex_destroy(&rsz->ops_lock);
>  	return ret;
>  }
>  
>  int rkisp1_resizer_devs_register(struct rkisp1_device *rkisp1)
>  {
> -	struct rkisp1_resizer *rsz;
> -	unsigned int i, j;
> +	unsigned int i;
>  	int ret;
>  
>  	for (i = 0; i < ARRAY_SIZE(rkisp1->resizer_devs); i++) {
> -		rsz = &rkisp1->resizer_devs[i];
> +		struct rkisp1_resizer *rsz = &rkisp1->resizer_devs[i];
> +
>  		rsz->rkisp1 = rkisp1;
>  		rsz->id = i;
> +
>  		ret = rkisp1_rsz_register(rsz);
> -		if (ret)
> -			goto err_unreg_resizer_devs;
> +		if (ret) {
> +			rsz->rkisp1 = NULL;
> +			rkisp1_resizer_devs_unregister(rkisp1);
> +			return ret;
> +		}
>  	}
>  
>  	return 0;
> -
> -err_unreg_resizer_devs:
> -	for (j = 0; j < i; j++) {
> -		rsz = &rkisp1->resizer_devs[j];
> -		rkisp1_rsz_unregister(rsz);
> -	}
> -
> -	return ret;
>  }
>  
>  void rkisp1_resizer_devs_unregister(struct rkisp1_device *rkisp1)
> -- 
> Regards,
> 
> Laurent Pinchart
> 
>