linux-kernel - Re: [PATCH v4 2/4] leds: Add managed API to get a LED from a device driver

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Date:   Wed, 31 Jul 2019 16:23:07 +0300
From:   Tomi Valkeinen <tomi.valkeinen@...com>
To:     Jean-Jacques Hiblot <jjhiblot@...com>,
        <jacek.anaszewski@...il.com>, <pavel@....cz>, <robh+dt@...nel.org>,
        <mark.rutland@....com>, <lee.jones@...aro.org>,
        <daniel.thompson@...aro.org>, <jingoohan1@...il.com>
CC:     <dmurphy@...com>, <linux-leds@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>
Subject: Re: [PATCH v4 2/4] leds: Add managed API to get a LED from a device
 driver

On 17/07/2019 17:15, Jean-Jacques Hiblot wrote:

> +struct led_classdev *__must_check devm_led_get(struct device *dev,
> +					       int index)
> +{
> +	struct led_classdev *led;
> +	struct led_classdev **dr;
> +

Should you check here if dev->of_node == NULL? Or should of_led_get() 
check it.

> +	led = of_led_get(dev->of_node, index);
> +	if (IS_ERR(led))
> +		return led;
> +
> +	dr = devres_alloc(devm_led_release, sizeof(struct led_classdev *),
> +			  GFP_KERNEL);
> +	if (!dr) {
> +		led_put(led);
> +		return ERR_PTR(-ENOMEM);
> +	}
> +
> +	*dr = led;
> +	devres_add(dev, dr);
> +
> +	return led;
> +}

  Tomi

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