linux-kernel - Re: [PATCH] hwmon: replace snprintf in show functions with sysfs

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Date:   Fri, 15 Oct 2021 15:00:59 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Qing Wang <wangqing@...o.com>, Jean Delvare <jdelvare@...e.com>,
        linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] hwmon: replace snprintf in show functions with sysfs_emit

On 10/14/21 11:48 PM, Qing Wang wrote:
> show() must not use snprintf() when formatting the value to be
> returned to user space.
> 
> Fix the following coccicheck warning:
> drivers/hwmon/smm665.c:378: WARNING: use scnprintf or sprintf.
> 
> Use sysfs_emit instead of scnprintf or sprintf makes more sense.
> 
> Signed-off-by: Qing Wang <wangqing@...o.com>

Please refrain from such cleanup patches unless you also
make functional changes to a driver.

Guenter

> ---
>   drivers/hwmon/smm665.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/hwmon/smm665.c b/drivers/hwmon/smm665.c
> index 62906d9..122031e 100644
> --- a/drivers/hwmon/smm665.c
> +++ b/drivers/hwmon/smm665.c
> @@ -375,7 +375,7 @@ static ssize_t smm665_show_##what(struct device *dev, \
>   { \
>   	struct sensor_device_attribute *attr = to_sensor_dev_attr(da); \
>   	const int val = smm665_get_##what(dev, attr->index); \
> -	return snprintf(buf, PAGE_SIZE, "%d\n", val); \
> +	return sysfs_emit(buf, "%d\n", val); \
>   }
>   
>   SMM665_SHOW(min);
>