linux-kernel - Re: [PATCHv3 02/16] drivers: thermal: introduce device tree parser

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Date:	Wed, 18 Sep 2013 12:11:23 -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,
	linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
	lm-sensors@...sensors.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCHv3 02/16] drivers: thermal: introduce device tree parser

On Wed, 2013-09-18 at 15:02 -0400, Eduardo Valentin wrote:
> This patch introduces a device tree bindings for
> describing the hardware thermal behavior and limits.
> Also a parser to read and interpret the data and feed
> it in the thermal framework is presented.

trivial notes:

> diff --git a/drivers/thermal/of-thermal.c b/drivers/thermal/of-thermal.c
[]
> +static int of_thermal_get_trend(struct thermal_zone_device *tz, int trip,
> +				enum thermal_trend *trend)
> +{
> +	struct __thermal_zone *data = tz->devdata;
> +	long dev_trend;
> +	int r;
> +
> +	if (!data->get_trend)
> +		return -EINVAL;
> +
> +	r = data->get_trend(data->sensor_data, &dev_trend);
> +	if (r)
> +		return r;
> +
> +	if (dev_trend > 0)
> +		*trend = THERMAL_TREND_RAISING;
> +	else if (dev_trend < 0)
> +		*trend = THERMAL_TREND_DROPPING;
> +	else
> +		*trend = THERMAL_TREND_STABLE;
> +
> +	return 0;
> +}

If readings are within some non zero noise level,
perhaps stable should be returned.

> +static struct __thermal_zone *
> +thermal_of_build_thermal_zone(struct device_node *np)
> +{
> +	struct device_node *child, *gchild;
> +	struct __thermal_zone *tz;
> +	int ret, i;
> +	u32 prop;
> +
> +	if (!np) {
> +		pr_err("no thermal zone np\n");
> +		return ERR_PTR(-EINVAL);
> +	}
> +
> +	tz = kzalloc(sizeof(*tz), GFP_KERNEL);
> +	if (!tz) {
> +		pr_err("not enough memory for thermal of zone\n");

Unnecessary OOM message.
All allocs without GFP_NOWARN get a dump_stack()

> +int __init of_parse_thermal_zones(void)
> +{
[]
> +		ops = kzalloc(sizeof(*ops), GFP_KERNEL);
> +		if (!ops) {
> +			pr_err("no memory available for thermal ops\n");
> +			return 0;
> +		}
> +		memcpy(ops, &of_thermal_ops, sizeof(*ops));
> +
> +		tzp = kzalloc(sizeof(*tzp), GFP_KERNEL);
> +		if (!ops) {
> +			pr_err("no memory available for thermal zone params\n");
> +			return 0;
> +		}

a couple more OOMs.


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