unsigned long dev_pm_opp_get_max_volt_latency()

in core.c [228:289]

• 45 lines of code
• 10 McCabe index (conditional complexity)

unsigned long dev_pm_opp_get_max_volt_latency(struct device *dev)
{
	struct opp_table *opp_table;
	struct dev_pm_opp *opp;
	struct regulator *reg;
	unsigned long latency_ns = 0;
	int ret, i, count;
	struct {
		unsigned long min;
		unsigned long max;
	} *uV;

	opp_table = _find_opp_table(dev);
	if (IS_ERR(opp_table))
		return 0;

	/* Regulator may not be required for the device */
	if (!opp_table->regulators)
		goto put_opp_table;

	count = opp_table->regulator_count;

	uV = kmalloc_array(count, sizeof(*uV), GFP_KERNEL);
	if (!uV)
		goto put_opp_table;

	mutex_lock(&opp_table->lock);

	for (i = 0; i < count; i++) {
		uV[i].min = ~0;
		uV[i].max = 0;

		list_for_each_entry(opp, &opp_table->opp_list, node) {
			if (!opp->available)
				continue;

			if (opp->supplies[i].u_volt_min < uV[i].min)
				uV[i].min = opp->supplies[i].u_volt_min;
			if (opp->supplies[i].u_volt_max > uV[i].max)
				uV[i].max = opp->supplies[i].u_volt_max;
		}
	}

	mutex_unlock(&opp_table->lock);

	/*
	 * The caller needs to ensure that opp_table (and hence the regulator)
	 * isn't freed, while we are executing this routine.
	 */
	for (i = 0; i < count; i++) {
		reg = opp_table->regulators[i];
		ret = regulator_set_voltage_time(reg, uV[i].min, uV[i].max);
		if (ret > 0)
			latency_ns += ret * 1000;
	}

	kfree(uV);
put_opp_table:
	dev_pm_opp_put_opp_table(opp_table);

	return latency_ns;
}