linux-kernel - Re: [PATCH v5 1/1] hwmon: Add driver for Astera Labs PT5161L retimer

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Date: Mon, 5 Feb 2024 11:43:35 -0800
From: Guenter Roeck <linux@...ck-us.net>
To: Cosmo Chou <chou.cosmo@...il.com>
Cc: robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
	conor+dt@...nel.org, jdelvare@...e.com, corbet@....net,
	broonie@...nel.org, naresh.solanki@...ements.com,
	vincent@...emblay.dev, patrick.rudolph@...ements.com,
	luca.ceresoli@...tlin.com, bhelgaas@...gle.com, festevam@...x.de,
	alexander.stein@...tq-group.com, heiko@...ech.de,
	jernej.skrabec@...il.com, macromorgan@...mail.com,
	forbidden405@...mail.com, sre@...nel.org, linus.walleij@...aro.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-hwmon@...r.kernel.org, linux-doc@...r.kernel.org,
	cosmo.chou@...ntatw.com
Subject: Re: [PATCH v5 1/1] hwmon: Add driver for Astera Labs PT5161L retimer

On Mon, Feb 05, 2024 at 11:20:13PM +0800, Cosmo Chou wrote:
> This driver implements support for temperature monitoring of Astera Labs
> PT5161L series PCIe retimer chips.
> 
> This driver implementation originates from the CSDK available at
> Link: https://github.com/facebook/openbmc/tree/helium/common/recipes-lib/retimer-v2.14
> The communication protocol utilized is based on the I2C/SMBus standard.
> 
> Signed-off-by: Cosmo Chou <chou.cosmo@...il.com>
> ---
[ ... ]

> +static ssize_t pt5161l_debugfs_read_fw_ver(struct file *file, char __user *buf,
> +					   size_t count, loff_t *ppos)
> +{
> +	struct pt5161l_data *data = file->private_data;
> +	int ret;
> +	char ver[32];
> +
> +	mutex_lock(&data->lock);
> +	ret = pt5161l_fwsts_check(data);
> +	mutex_unlock(&data->lock);
> +	if (ret)
> +		return ret;
> +
> +	ret = snprintf(ver, sizeof(ver), "%u.%u.%u\n", data->fw_ver.major,
> +		       data->fw_ver.minor, data->fw_ver.build);
> +	if (ret < 0)
> +		return ret;
> +

You almost got me here ;-). snprintf() never returns a negative error code,
so checking for it is not necessary.

> +	return simple_read_from_buffer(buf, count, ppos, ver, ret + 1);

Number of bytes written plus 1 ? Why ?

Thanks,
Guenter