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

[Greg KH]

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 :(