linux-kernel - Re: [PATCH] media: imx: Constify static struct v4l2_m2m

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Date:   Thu, 14 Oct 2021 12:47:40 +0200
From:   Philipp Zabel <p.zabel@...gutronix.de>
To:     Rikard Falkeborn <rikard.falkeborn@...il.com>,
        Steve Longerbeam <slongerbeam@...il.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        linux-media@...r.kernel.org, linux-staging@...ts.linux.dev,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] media: imx: Constify static struct v4l2_m2m_ops

Hi Rikard,

On Tue, 2021-10-12 at 23:47 +0200, Rikard Falkeborn wrote:
> The only usage of m2m_ops is to pass its address to v4l2_m2m_init(),
> which  takes a pointer to const v4l2_m2m_ops as argument. Make it const
> to allow the compiler to put it in read-only memory.
> 
> Signed-off-by: Rikard Falkeborn <rikard.falkeborn@...il.com>
> ---
>  drivers/staging/media/imx/imx-media-csc-scaler.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/media/imx/imx-media-csc-scaler.c b/drivers/staging/media/imx/imx-media-csc-scaler.c
> index eb6da9b9d8ba..1fd39a2fca98 100644
> --- a/drivers/staging/media/imx/imx-media-csc-scaler.c
> +++ b/drivers/staging/media/imx/imx-media-csc-scaler.c
> @@ -820,7 +820,7 @@ static const struct v4l2_file_operations ipu_csc_scaler_fops = {
>  	.mmap		= v4l2_m2m_fop_mmap,
>  };
>  
> -static struct v4l2_m2m_ops m2m_ops = {
> +static const struct v4l2_m2m_ops m2m_ops = {
>  	.device_run	= device_run,
>  	.job_abort	= job_abort,
>  };

Thank you,

Reviewed-by: Philipp Zabel <p.zabel@...gutronix.de>

regards
Philipp