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

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Message-ID: <1cc95085-2465-9f01-094b-c4233cd665c1@gmail.com>
Date:   Wed, 17 Jul 2019 23:03:01 +0200
From:   Jacek Anaszewski <jacek.anaszewski@...il.com>
To:     Pavel Machek <pavel@....cz>
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 Pavel,

On 7/4/19 12:00 AM, Pavel Machek wrote:
> Hi!
> 
> Sorry for the delay.

No problem.

>> @@ -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?

Ack.

>> +	[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 \.

Right.

>> +	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.

Ack.

>> +	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.

Indeed. I'll change strncpy to strscpy.

> I did not check the shell script.
> 
> With that fixed,
> 
> Acked-by: Pavel Machek <pavel@....cz>

Thanks!

-- 
Best regards,
Jacek Anaszewski