linux-kernel - Re: [PATCH v6 2/5] leds: Add helper for getting default pattern from Device Tree

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Date:   Mon, 7 Jan 2019 18:49:24 +0100
From:   Pavel Machek <pavel@....cz>
To:     Krzysztof Kozlowski <krzk@...nel.org>
Cc:     Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-kernel@...r.kernel.org, linux-leds@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v6 2/5] leds: Add helper for getting default pattern from
 Device Tree

Hi!

> Multiple LED triggers might need to access default pattern so add a
> helper for that.
> 
>  }
>  EXPORT_SYMBOL_GPL(led_update_brightness);
>  
> +u32 *led_get_default_pattern(struct led_classdev *led_cdev, unsigned int *size)
> +{
> +	struct device_node *np = dev_of_node(led_cdev->dev);
> +	u32 *pattern;
> +	int count;
> +
> +	if (!np)
> +		return NULL;
> +
> +	count = of_property_count_u32_elems(np, "led-pattern");
> +	if (count < 0)
> +		return NULL;
> +
> +	pattern = kcalloc(count, sizeof(*pattern), GFP_KERNEL);
> +	if (!pattern)
> +		return NULL;
> +
> +	if (of_property_read_u32_array(np, "led-pattern", pattern, count))
> +		goto err;

Just kfree and return here. No need for goto if that is just one case.


>  /**
> + * led_get_default_pattern - return default pattern
> + *
> + * @led_cdev: the LED to get default pattern for
> + * @size:     pointer for storing the number of elements in returned array,
> + *            modified only if return != NULL
> + *
> + * Return:    Allocated array of integers with default pattern from DeviceTree
> + *            or NULL.  Caller is responsible for kfree().
> + */

"DeviceTree" -> "device tree".

									Pavel

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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