linux-kernel - Re: [char-misc-next V2] mei: add device kind to sysfs

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Date:   Tue, 28 Jul 2020 20:52:19 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Tomas Winkler <tomas.winkler@...el.com>
Cc:     Alexander Usyskin <alexander.usyskin@...el.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [char-misc-next V2] mei: add device kind to sysfs

On Tue, Jul 28, 2020 at 09:28:36PM +0300, Tomas Winkler wrote:
> +/**
> + * kind_show - display device kind
> + *
> + * @device: device pointer
> + * @attr: attribute pointer
> + * @buf: char out buffer
> + *
> + * Return: number of the bytes printed into buf or error

No need for kernel doc for static sysfs attributes, but ok...

> + */
> +static ssize_t kind_show(struct device *device,
> +			 struct device_attribute *attr, char *buf)
> +{
> +	struct mei_device *dev = dev_get_drvdata(device);
> +	ssize_t ret = 0;

No need to initialize this.

> +
> +	mutex_lock(&dev->device_lock);
> +	if (dev->kind)
> +		ret = sprintf(buf, "%s\n", dev->kind);
> +	else
> +		ret = sprintf(buf, "%s\n", "mei");
> +	mutex_unlock(&dev->device_lock);

Why do you need a lock?  kind can not change, so what are you trying to
protect from?

thanks,

greg k-h