linux-kernel - Re: [PATCH] media: i2c: rdacm20: Constify static structs

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Date:   Fri, 20 Nov 2020 11:39:19 +0000
From:   Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
To:     Rikard Falkeborn <rikard.falkeborn@...il.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>
Cc:     Jacopo Mondi <jacopo+renesas@...ndi.org>,
        Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
        Niklas Söderlund 
        <niklas.soderlund+renesas@...natech.se>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] media: i2c: rdacm20: Constify static structs

Hi Rikard,

Thank you for the fix.

On 19/11/2020 22:22, Rikard Falkeborn wrote:
> The only usage of rdacm20_video_ops is to assign it to the video field
> in the v4l2_subdev_ops struct which is a pointer to const,  and the only
> usage of rdacm20_subdev_ops is to pass its address to
> v4l2_i2c_subdev_init() which accepts a pointer to const. Make them const
> to allow the compiler to put them in read-only memory.
> 
> Signed-off-by: Rikard Falkeborn <rikard.falkeborn@...il.com>

Reviewed-by: Kieran Bingham <kieran.bingham+renesas@...asonboard.com>

> ---
>  drivers/media/i2c/rdacm20.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/media/i2c/rdacm20.c b/drivers/media/i2c/rdacm20.c
> index 1ed928c4ca70..ac00a6743623 100644
> --- a/drivers/media/i2c/rdacm20.c
> +++ b/drivers/media/i2c/rdacm20.c
> @@ -435,7 +435,7 @@ static int rdacm20_get_fmt(struct v4l2_subdev *sd,
>  	return 0;
>  }
>  
> -static struct v4l2_subdev_video_ops rdacm20_video_ops = {
> +static const struct v4l2_subdev_video_ops rdacm20_video_ops = {
>  	.s_stream	= rdacm20_s_stream,
>  };
>  
> @@ -445,7 +445,7 @@ static const struct v4l2_subdev_pad_ops rdacm20_subdev_pad_ops = {
>  	.set_fmt	= rdacm20_get_fmt,
>  };
>  
> -static struct v4l2_subdev_ops rdacm20_subdev_ops = {
> +static const struct v4l2_subdev_ops rdacm20_subdev_ops = {
>  	.video		= &rdacm20_video_ops,
>  	.pad		= &rdacm20_subdev_pad_ops,
>  };
>