linux-kernel - Re: [PATCH v6 13/14] platform/x86: wmi: create character devices when requested by drivers

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Date:   Tue, 10 Oct 2017 13:04:20 +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
Subject: Re: [PATCH v6 13/14] platform/x86: wmi: create character devices
 when requested by drivers

On Mon, Oct 09, 2017 at 05:51:51PM -0500, Mario Limonciello wrote:
> +static long wmi_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
> +{
> +	struct wmi_driver *wdriver = NULL;
> +	struct wmi_block *wblock = NULL;
> +	const char *driver_name;
> +	struct list_head *p;
> +	int ret;
> +
> +	if (_IOC_TYPE(cmd) != WMI_IOC)
> +		return -ENOTTY;
> +
> +	driver_name = filp->f_path.dentry->d_iname;
> +
> +	list_for_each(p, &wmi_block_list) {

No locking while walking the list, you are brave :(