linux-kernel - Re: [PATCH v10 13/15] platform/x86: wmi: create userspace interface for drivers

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Date:   Fri, 20 Oct 2017 15:22:42 +0200
From:   Greg KH <greg@...ah.com>
To:     Mario Limonciello <mario.limonciello@...l.com>
Cc:     dvhart@...radead.org, Andy Shevchenko <andy.shevchenko@...il.com>,
        LKML <linux-kernel@...r.kernel.org>,
        platform-driver-x86@...r.kernel.org,
        Andy Lutomirski <luto@...nel.org>, quasisec@...gle.com,
        pali.rohar@...il.com, rjw@...ysocki.net, mjg59@...gle.com,
        hch@....de, Alan Cox <gnomes@...rguk.ukuu.org.uk>
Subject: Re: [PATCH v10 13/15] platform/x86: wmi: create userspace interface
 for drivers

On Thu, Oct 19, 2017 at 12:50:16PM -0500, Mario Limonciello wrote:
> +static ssize_t wmi_char_read(struct file *filp, char __user *buffer,
> +	size_t length, loff_t *offset)
> +{
> +	struct wmi_block *wblock = filp->private_data;
> +	size_t count;
> +
> +	if (*offset != 0)
> +		return 0;
> +
> +	count = sizeof(wblock->req_buf_size);
> +	count = length < count ? length : count;
> +
> +	if (copy_to_user(buffer, &wblock->req_buf_size, count))
> +		return -EFAULT;
> +
> +	*offset = count;
> +	return count;

simple_read_from_buffer()?  Library functions are your friend :)

thanks,

greg k-h