linux-kernel - Re: [PATCH v3] Add driver to force WMI Thunderbolt controller power status

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Message-ID: <20170913172024.GA8782@wunner.de>
Date:   Wed, 13 Sep 2017 19:20:24 +0200
From:   Lukas Wunner <lukas@...ner.de>
To:     Mario Limonciello <mario.limonciello@...l.com>
Cc:     dvhart@...radead.org, LKML <linux-kernel@...r.kernel.org>,
        platform-driver-x86@...r.kernel.org,
        Richard Hughes <hughsient@...il.com>,
        Yehezkel Bernat <yehezkelshb@...il.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>
Subject: Re: [PATCH v3] Add driver to force WMI Thunderbolt controller power
 status

Sorry, late to the party.

On Fri, Sep 08, 2017 at 10:23:11AM -0500, Mario Limonciello wrote:
> +	mode = hex_to_bin(buf[0]);
> +	if (mode == 0 || mode == 1) {
> +		status = wmi_evaluate_method(INTEL_WMI_THUNDERBOLT_GUID, 0, 1,
> +					     &input, NULL);
> +		if (ACPI_FAILURE(status)) {
> +			pr_err("intel-wmi-thunderbolt: failed setting %s\n",
> +			       buf);
> +			return -ENODEV;
> +		}
> +	} else {
> +		pr_err("intel-wmi-thunderbolt: unsupported mode: %d", mode);
> +	}
> +	return count;
> +}

Seems odd to allow user space to fill the log by writing invalid data
to sysfs, likewise that success is returned in the else case.
I'd drop both pr_err() and return -EINVAL in the else case.


> +static const struct wmi_device_id intel_wmi_thunderbolt_id_table[] = {
> +	{ .guid_string = INTEL_WMI_THUNDERBOLT_GUID },
> +	{ },
> +};

I'm not familiar with WMI, but don't you need a MODULE_DEVICE_TABLE here?
How does user space know which module to load upon receiving the uevent?

Thanks,

Lukas