linux-kernel - Re: [PATCHv4 02/16] drivers: thermal: introduce device tree parser

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Date:	Wed, 18 Sep 2013 13:44:50 -0700
From:	Joe Perches <joe@...ches.com>
To:	Eduardo Valentin <eduardo.valentin@...com>
Cc:	swarren@...dotorg.org, pawel.moll@....com, mark.rutland@....com,
	ian.campbell@...rix.com, rob.herring@...xeda.com,
	linux@...ck-us.net, rui.zhang@...el.com, wni@...dia.com,
	grant.likely@...aro.org, durgadoss.r@...el.com,
	lm-sensors@...sensors.org, linux-kernel@...r.kernel.org,
	linux-pm@...r.kernel.org
Subject: Re: [PATCHv4 02/16] drivers: thermal: introduce device tree parser

On Wed, 2013-09-18 at 16:31 -0400, Eduardo Valentin wrote:

> +/**
> + * of_parse_thermal_zones - parse device tree thermal data
> + *
> + * Initialization function that can be called by machine initialization
> + * code to parse thermal data and populate the thermal framework
> + * with hardware thermal zones info. This function only parses thermal zones.
> + * Cooling devices and sensor devices nodes are supposed to be parsed
> + * by their respective drivers.
> + *
> + * Return: 0 on success, proper error code otherwise
> + *
> + */
> +int __init of_parse_thermal_zones(void)
> +{
> +	struct device_node *np, *child;
> +	struct __thermal_zone *tz;
> +	struct thermal_zone_device_ops *ops;
> +
> +	np = of_find_node_by_name(NULL, "thermal-zones");
> +	if (!np) {
> +		pr_err("unable to find thermal zones\n");
> +		return 0;

return 0? This is success?

> +	}
> +
> +	for_each_child_of_node(np, child) {
> +		struct thermal_zone_device *zone;
> +		struct thermal_zone_params *tzp;
> +
> +		tz = thermal_of_build_thermal_zone(child);
> +		if (IS_ERR(tz)) {
> +			pr_err("failed to build thermal zone %ld\n",
> +			       PTR_ERR(tz));
> +			return 0;
> +		}
> +
> +		ops = kzalloc(sizeof(*ops), GFP_KERNEL);
> +		if (!ops)
> +			return 0;
> +
> +		memcpy(ops, &of_thermal_ops, sizeof(*ops));

kmemdup instead of alloc/memcpy

> +		tzp = kzalloc(sizeof(*tzp), GFP_KERNEL);
> +		if (!ops)
> +			return 0;
> +
> +		/* No hwmon because there might be hwmon drivers registering */
> +		tzp->no_hwmon = true;
> +
> +		zone = thermal_zone_device_register(child->name, tz->ntrips,
> +						    0, tz,
> +						    ops, tzp,
> +						    tz->passive_delay,
> +						    tz->polling_delay);
> +		if (IS_ERR(zone))
> +			pr_err("Failed to build %s zone %ld\n", child->name,
> +			       PTR_ERR(zone));
> +	}
> +	return 0;
> +}

All returns are 0, always successful?


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