int __init of_parse_thermal_zones()

in thermal_of.c [1045:1121]

• 59 lines of code
• 8 McCabe index (conditional complexity)

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_debug("unable to find thermal zones\n");
		return 0; /* Run successfully on systems without thermal DT */
	}

	for_each_available_child_of_node(np, child) {
		struct thermal_zone_device *zone;
		struct thermal_zone_params *tzp;
		int i, mask = 0;
		u32 prop;

		tz = thermal_of_build_thermal_zone(child);
		if (IS_ERR(tz)) {
			pr_err("failed to build thermal zone %pOFn: %ld\n",
			       child,
			       PTR_ERR(tz));
			continue;
		}

		ops = kmemdup(&of_thermal_ops, sizeof(*ops), GFP_KERNEL);
		if (!ops)
			goto exit_free;

		tzp = kzalloc(sizeof(*tzp), GFP_KERNEL);
		if (!tzp) {
			kfree(ops);
			goto exit_free;
		}

		/* No hwmon because there might be hwmon drivers registering */
		tzp->no_hwmon = true;

		if (!of_property_read_u32(child, "sustainable-power", &prop))
			tzp->sustainable_power = prop;

		for (i = 0; i < tz->ntrips; i++)
			mask |= 1 << i;

		/* these two are left for temperature drivers to use */
		tzp->slope = tz->slope;
		tzp->offset = tz->offset;

		zone = thermal_zone_device_register(child->name, tz->ntrips,
						    mask, tz,
						    ops, tzp,
						    tz->passive_delay,
						    tz->polling_delay);
		if (IS_ERR(zone)) {
			pr_err("Failed to build %pOFn zone %ld\n", child,
			       PTR_ERR(zone));
			kfree(tzp);
			kfree(ops);
			of_thermal_free_zone(tz);
			/* attempting to build remaining zones still */
		}
	}
	of_node_put(np);

	return 0;

exit_free:
	of_node_put(child);
	of_node_put(np);
	of_thermal_free_zone(tz);

	/* no memory available, so free what we have built */
	of_thermal_destroy_zones();

	return -ENOMEM;
}