static int create_trip_attrs()

in thermal_sysfs.c [413:507]

• 78 lines of code
• 13 McCabe index (conditional complexity)

static int create_trip_attrs(struct thermal_zone_device *tz, int mask)
{
	struct attribute **attrs;
	int indx;

	/* This function works only for zones with at least one trip */
	if (tz->trips <= 0)
		return -EINVAL;

	tz->trip_type_attrs = kcalloc(tz->trips, sizeof(*tz->trip_type_attrs),
				      GFP_KERNEL);
	if (!tz->trip_type_attrs)
		return -ENOMEM;

	tz->trip_temp_attrs = kcalloc(tz->trips, sizeof(*tz->trip_temp_attrs),
				      GFP_KERNEL);
	if (!tz->trip_temp_attrs) {
		kfree(tz->trip_type_attrs);
		return -ENOMEM;
	}

	if (tz->ops->get_trip_hyst) {
		tz->trip_hyst_attrs = kcalloc(tz->trips,
					      sizeof(*tz->trip_hyst_attrs),
					      GFP_KERNEL);
		if (!tz->trip_hyst_attrs) {
			kfree(tz->trip_type_attrs);
			kfree(tz->trip_temp_attrs);
			return -ENOMEM;
		}
	}

	attrs = kcalloc(tz->trips * 3 + 1, sizeof(*attrs), GFP_KERNEL);
	if (!attrs) {
		kfree(tz->trip_type_attrs);
		kfree(tz->trip_temp_attrs);
		if (tz->ops->get_trip_hyst)
			kfree(tz->trip_hyst_attrs);
		return -ENOMEM;
	}

	for (indx = 0; indx < tz->trips; indx++) {
		/* create trip type attribute */
		snprintf(tz->trip_type_attrs[indx].name, THERMAL_NAME_LENGTH,
			 "trip_point_%d_type", indx);

		sysfs_attr_init(&tz->trip_type_attrs[indx].attr.attr);
		tz->trip_type_attrs[indx].attr.attr.name =
						tz->trip_type_attrs[indx].name;
		tz->trip_type_attrs[indx].attr.attr.mode = S_IRUGO;
		tz->trip_type_attrs[indx].attr.show = trip_point_type_show;
		attrs[indx] = &tz->trip_type_attrs[indx].attr.attr;

		/* create trip temp attribute */
		snprintf(tz->trip_temp_attrs[indx].name, THERMAL_NAME_LENGTH,
			 "trip_point_%d_temp", indx);

		sysfs_attr_init(&tz->trip_temp_attrs[indx].attr.attr);
		tz->trip_temp_attrs[indx].attr.attr.name =
						tz->trip_temp_attrs[indx].name;
		tz->trip_temp_attrs[indx].attr.attr.mode = S_IRUGO;
		tz->trip_temp_attrs[indx].attr.show = trip_point_temp_show;
		if (IS_ENABLED(CONFIG_THERMAL_WRITABLE_TRIPS) &&
		    mask & (1 << indx)) {
			tz->trip_temp_attrs[indx].attr.attr.mode |= S_IWUSR;
			tz->trip_temp_attrs[indx].attr.store =
							trip_point_temp_store;
		}
		attrs[indx + tz->trips] = &tz->trip_temp_attrs[indx].attr.attr;

		/* create Optional trip hyst attribute */
		if (!tz->ops->get_trip_hyst)
			continue;
		snprintf(tz->trip_hyst_attrs[indx].name, THERMAL_NAME_LENGTH,
			 "trip_point_%d_hyst", indx);

		sysfs_attr_init(&tz->trip_hyst_attrs[indx].attr.attr);
		tz->trip_hyst_attrs[indx].attr.attr.name =
					tz->trip_hyst_attrs[indx].name;
		tz->trip_hyst_attrs[indx].attr.attr.mode = S_IRUGO;
		tz->trip_hyst_attrs[indx].attr.show = trip_point_hyst_show;
		if (tz->ops->set_trip_hyst) {
			tz->trip_hyst_attrs[indx].attr.attr.mode |= S_IWUSR;
			tz->trip_hyst_attrs[indx].attr.store =
					trip_point_hyst_store;
		}
		attrs[indx + tz->trips * 2] =
					&tz->trip_hyst_attrs[indx].attr.attr;
	}
	attrs[tz->trips * 3] = NULL;

	tz->trips_attribute_group.attrs = attrs;

	return 0;
}