linux-kernel - Re: [PATCH V3] media: i2c: ccs: replace snprintf in show functions with sysfs

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Date:   Wed, 20 Oct 2021 10:47:36 +0100
From:   Kieran Bingham <kieran.bingham@...asonboard.com>
To:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Qing Wang <wangqing@...o.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        linux-kernel@...r.kernel.org, linux-media@...r.kernel.org
Cc:     Qing Wang <wangqing@...o.com>
Subject: Re: [PATCH V3] media: i2c: ccs: replace snprintf in show functions with sysfs_emit

Hi Qing,

Quoting Qing Wang (2021-10-20 03:14:15)
> show() should not use snprintf() when formatting the value to be
> returned to user space.
> 
> Fix the following coccicheck warning:
> drivers/media/i2c/ccs/ccs-core.c:3761: WARNING: use scnprintf or sprintf.
> 
> V3:
> - Fix some formatting problems.

This could go below the --- so that it doesn't get entered into the
commit itself, but I suspect that can be handled while applying. Not
sure what the preferences are for that.

Anyway, thank you for updating with my suggestions.

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

> 
> Signed-off-by: Qing Wang <wangqing@...o.com>
> ---
>  drivers/media/i2c/ccs/ccs-core.c | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/media/i2c/ccs/ccs-core.c b/drivers/media/i2c/ccs/ccs-core.c
> index 5363f3b..9158d3c
> --- a/drivers/media/i2c/ccs/ccs-core.c
> +++ b/drivers/media/i2c/ccs/ccs-core.c
> @@ -2758,13 +2758,13 @@ ident_show(struct device *dev, struct device_attribute *attr, char *buf)
>         struct ccs_module_info *minfo = &sensor->minfo;
>  
>         if (minfo->mipi_manufacturer_id)
> -               return snprintf(buf, PAGE_SIZE, "%4.4x%4.4x%2.2x\n",
> -                               minfo->mipi_manufacturer_id, minfo->model_id,
> -                               minfo->revision_number) + 1;
> +               return sysfs_emit(buf, "%4.4x%4.4x%2.2x\n",
> +                                 minfo->mipi_manufacturer_id, minfo->model_id,
> +                                 minfo->revision_number) + 1;
>         else
> -               return snprintf(buf, PAGE_SIZE, "%2.2x%4.4x%2.2x\n",
> -                               minfo->smia_manufacturer_id, minfo->model_id,
> -                               minfo->revision_number) + 1;
> +               return sysfs_emit(buf, "%2.2x%4.4x%2.2x\n",
> +                                 minfo->smia_manufacturer_id, minfo->model_id,
> +                                 minfo->revision_number) + 1;
>  }
>  static DEVICE_ATTR_RO(ident);
>  
> -- 
> 2.7.4
>