static int _set_required_opps()

in core.c [885:940]

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

static int _set_required_opps(struct device *dev,
			      struct opp_table *opp_table,
			      struct dev_pm_opp *opp, bool up)
{
	struct opp_table **required_opp_tables = opp_table->required_opp_tables;
	struct device **genpd_virt_devs = opp_table->genpd_virt_devs;
	int i, ret = 0;

	if (!required_opp_tables)
		return 0;

	/* required-opps not fully initialized yet */
	if (lazy_linking_pending(opp_table))
		return -EBUSY;

	/*
	 * We only support genpd's OPPs in the "required-opps" for now, as we
	 * don't know much about other use cases. Error out if the required OPP
	 * doesn't belong to a genpd.
	 */
	if (unlikely(!required_opp_tables[0]->is_genpd)) {
		dev_err(dev, "required-opps don't belong to a genpd\n");
		return -ENOENT;
	}

	/* Single genpd case */
	if (!genpd_virt_devs)
		return _set_required_opp(dev, dev, opp, 0);

	/* Multiple genpd case */

	/*
	 * Acquire genpd_virt_dev_lock to make sure we don't use a genpd_dev
	 * after it is freed from another thread.
	 */
	mutex_lock(&opp_table->genpd_virt_dev_lock);

	/* Scaling up? Set required OPPs in normal order, else reverse */
	if (up) {
		for (i = 0; i < opp_table->required_opp_count; i++) {
			ret = _set_required_opp(dev, genpd_virt_devs[i], opp, i);
			if (ret)
				break;
		}
	} else {
		for (i = opp_table->required_opp_count - 1; i >= 0; i--) {
			ret = _set_required_opp(dev, genpd_virt_devs[i], opp, i);
			if (ret)
				break;
		}
	}

	mutex_unlock(&opp_table->genpd_virt_dev_lock);

	return ret;
}