linux-kernel - Re: [PATCH] media: atmel-isi: drop unnecessary while loop

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Message-ID: <20180604132736.zay3ae5we6d7adsk@rfolt0960.corp.atmel.com>
Date:   Mon, 4 Jun 2018 15:27:36 +0200
From:   Ludovic Desroches <ludovic.desroches@...rochip.com>
To:     Nicholas Mc Guire <hofrat@...ntech.at>
CC:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        <linux-media@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        Nicholas Mc Guire <hofrat@...dl.org>
Subject: Re: [PATCH] media: atmel-isi: drop unnecessary while loop

On Fri, Jun 01, 2018 at 12:46:14PM +0000, Nicholas Mc Guire wrote:
> From: Nicholas Mc Guire <hofrat@...dl.org>
> 
> As there is no way this can loop it actually makes no sense to have
> a while(1){} around the body - all three possible paths end in a return
> statement. 
> 
> Signed-off-by: Nicholas Mc Guire <hofrat@...dl.org>
> Fixes: commit c1d82b895380 "[media] atmel-isi: move out of soc_camera to atmel"
Acked-by: Ludovic Desroches <ludovic.desroches@...rochip.com>

Thanks.

> ---
> 
> The diff output is unfortunately not that readable - essentially only
> the outer while(1){ } was removed. 
> 
> Patch was compile tested with: x86_64_defconfig + CONFIG_MEDIA_SUPPORT=y
> MEDIA_CAMERA_SUPPORT=y, CONFIG_MEDIA_CONTROLLER=y, V4L_PLATFORM_DRIVERS=y
> OF=y, CONFIG_COMPILE_TEST=y, CONFIG_VIDEO_ATMEL_ISI=y
> 
> Compile testing atmel-isi.c shows some sparse warnings. Seems to be due to
> sizeof operator being applied to a union (not related to the function being
> changed though).
> 
> Patch is against 4.17-rc7 (localversion-next is next-20180531)
> 
>  drivers/media/platform/atmel/atmel-isi.c | 28 +++++++++++++---------------
>  1 file changed, 13 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/media/platform/atmel/atmel-isi.c b/drivers/media/platform/atmel/atmel-isi.c
> index e5be21a..85fc7b9 100644
> --- a/drivers/media/platform/atmel/atmel-isi.c
> +++ b/drivers/media/platform/atmel/atmel-isi.c
> @@ -1106,23 +1106,21 @@ static int isi_graph_parse(struct atmel_isi *isi, struct device_node *node)
>  	struct device_node *ep = NULL;
>  	struct device_node *remote;
>  
> -	while (1) {
> -		ep = of_graph_get_next_endpoint(node, ep);
> -		if (!ep)
> -			return -EINVAL;
> -
> -		remote = of_graph_get_remote_port_parent(ep);
> -		if (!remote) {
> -			of_node_put(ep);
> -			return -EINVAL;
> -		}
> +	ep = of_graph_get_next_endpoint(node, ep);
> +	if (!ep)
> +		return -EINVAL;
>  
> -		/* Remote node to connect */
> -		isi->entity.node = remote;
> -		isi->entity.asd.match_type = V4L2_ASYNC_MATCH_FWNODE;
> -		isi->entity.asd.match.fwnode = of_fwnode_handle(remote);
> -		return 0;
> +	remote = of_graph_get_remote_port_parent(ep);
> +	if (!remote) {
> +		of_node_put(ep);
> +		return -EINVAL;
>  	}
> +
> +	/* Remote node to connect */
> +	isi->entity.node = remote;
> +	isi->entity.asd.match_type = V4L2_ASYNC_MATCH_FWNODE;
> +	isi->entity.asd.match.fwnode = of_fwnode_handle(remote);
> +	return 0;
>  }
>  
>  static int isi_graph_init(struct atmel_isi *isi)
> -- 
> 2.1.4
>