linux-kernel - Re: [PATCH v5 05/26] leds: core: Add support for composing LED class device names

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Message-ID: <20190703220043.GA876@amd>
Date:   Thu, 4 Jul 2019 00:00:43 +0200
From:   Pavel Machek <pavel@....cz>
To:     Jacek Anaszewski <jacek.anaszewski@...il.com>
Cc:     linux-leds@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, robh@...nel.org, dtor@...gle.com,
        linux@...ck-us.net, dmurphy@...com,
        Baolin Wang <baolin.wang@...aro.org>,
        Daniel Mack <daniel@...que.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Oleh Kravchenko <oleg@....org.ua>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Simon Shields <simon@...eageos.org>
Subject: Re: [PATCH v5 05/26] leds: core: Add support for composing LED class
 device names

Hi!

Sorry for the delay.

> @@ -27,6 +29,18 @@ EXPORT_SYMBOL_GPL(leds_list_lock);
>  LIST_HEAD(leds_list);
>  EXPORT_SYMBOL_GPL(leds_list);
>  
> +const char *led_colors[LED_COLOR_ID_MAX] = {

const char * const , if we want to play that game?


> +	[LED_COLOR_ID_WHITE] = "white",
> +	[LED_COLOR_ID_RED] = "red",
> +	[LED_COLOR_ID_GREEN] = "green",
> +	[LED_COLOR_ID_BLUE] = "blue",
> +	[LED_COLOR_ID_AMBER] = "amber",
> +	[LED_COLOR_ID_VIOLET] = "violet",
> +	[LED_COLOR_ID_YELLOW] = "yellow",
> +	[LED_COLOR_ID_IR] = "ir",
> +};
> +EXPORT_SYMBOL_GPL(led_colors);
> +

> +	if (fwnode_property_present(fwnode, "label")) {
> +		ret = fwnode_property_read_string(fwnode, "label", &props->label);
> +		if (ret)
> +			dev_err(dev, "Error parsing \'label\' property (%d)\n", ret);
> +		return;

I don't think you need to escape ' with \.

> +	if (fwnode_property_present(fwnode, "function")) {
> +		ret = fwnode_property_read_string(fwnode, "function", &props->function);
> +		if (ret) {
> +			dev_err(dev,
> +				"Error parsing \'function\' property (%d)\n",
> +				ret);
> +		}
> +	} else {
> +		return;
> +	}

> +
> +	if (fwnode_property_present(fwnode, "function-enumerator")) {

I'd do if (!fwnode_property_present()) return; in both occasions, to
save an indentation level; but that's nitpicking.

> +	if (props.label) {
> +		/*
> +		 * If init_data.devicename is NULL, then it indicates that
> +		 * DT label should be used as-is for LED class device name.
> +		 * Otherwise the label is prepended with devicename to compose
> +		 * the final LED class device name.
> +		 */
> +		if (!devicename) {
> +			strncpy(led_classdev_name, props.label,
> +				LED_MAX_NAME_SIZE);
> +		} else {
> +			snprintf(led_classdev_name, LED_MAX_NAME_SIZE, "%s:%s",
> +				 devicename, props.label);
> +		}

Unlike snprintf(), strncpy() does not guarantee NULL termination.

I did not check the shell script.

With that fixed,

Acked-by: Pavel Machek <pavel@....cz>

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

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