linux-kernel - Re: [PATCH 02/17] staging: nuc-wmi: detect WMI API detection

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Message-ID: <20210517093545.GD1955@kadam>
Date:   Mon, 17 May 2021 12:35:45 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Cc:     gregkh@...uxfoundation.org, linuxarm@...wei.com,
        mauro.chehab@...wei.com, Pavel Machek <pavel@....cz>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        linux-leds@...r.kernel.org, linux-staging@...ts.linux.dev
Subject: Re: [PATCH 02/17] staging: nuc-wmi: detect WMI API detection

On Sun, May 16, 2021 at 12:53:30PM +0200, Mauro Carvalho Chehab wrote:
> -	leds = output[0];
> +	if (ver != LED_API_NUC6) {
> +		ret = nuc_nmi_cmd(dev, LED_VERSION_CONTROL, input, output);

Does this need to be checked?

	if (ret)
		return ret;

> +		ver = output[0] | output[1] << 16;
> +		if (!ver)
> +			ver = LED_API_REV_0_64;
> +		else if (ver == 0x0126)
> +			ver = LED_API_REV_1_0;
> +	}
> +
> +	/* Currently, only API Revision 0.64 is supported */
> +	if (ver != LED_API_REV_0_64)
> +		return -ENODEV;
> +
>  	if (!leds) {
>  		dev_warn(dev, "No LEDs found\n");
>  		return -ENODEV;

regards,
dan carpenter