Re: [PATCH] hwmon: replace snprintf in show functions with sysfs_emit

From: Guenter Roeck <linux@roeck-us.net>
To: Qing Wang <wangqing@vivo.com>, Jean Delvare <jdelvare@suse.com>,
	linux-hwmon@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] hwmon: replace snprintf in show functions with sysfs_emit
Date: Fri, 15 Oct 2021 15:00:59 -0700	[thread overview]
Message-ID: <96c3c93c-f959-a401-3c91-df58e2643a39@roeck-us.net> (raw)
In-Reply-To: <1634280525-4532-1-git-send-email-wangqing@vivo.com>

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@vivo.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);
> 