int pm_genpd_init()

in power/domain.c [1961:2031]

• 60 lines of code
• 14 McCabe index (conditional complexity)

int pm_genpd_init(struct generic_pm_domain *genpd,
		  struct dev_power_governor *gov, bool is_off)
{
	int ret;

	if (IS_ERR_OR_NULL(genpd))
		return -EINVAL;

	INIT_LIST_HEAD(&genpd->parent_links);
	INIT_LIST_HEAD(&genpd->child_links);
	INIT_LIST_HEAD(&genpd->dev_list);
	RAW_INIT_NOTIFIER_HEAD(&genpd->power_notifiers);
	genpd_lock_init(genpd);
	genpd->gov = gov;
	INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn);
	atomic_set(&genpd->sd_count, 0);
	genpd->status = is_off ? GENPD_STATE_OFF : GENPD_STATE_ON;
	genpd->device_count = 0;
	genpd->max_off_time_ns = -1;
	genpd->max_off_time_changed = true;
	genpd->provider = NULL;
	genpd->has_provider = false;
	genpd->accounting_time = ktime_get();
	genpd->domain.ops.runtime_suspend = genpd_runtime_suspend;
	genpd->domain.ops.runtime_resume = genpd_runtime_resume;
	genpd->domain.ops.prepare = genpd_prepare;
	genpd->domain.ops.suspend_noirq = genpd_suspend_noirq;
	genpd->domain.ops.resume_noirq = genpd_resume_noirq;
	genpd->domain.ops.freeze_noirq = genpd_freeze_noirq;
	genpd->domain.ops.thaw_noirq = genpd_thaw_noirq;
	genpd->domain.ops.poweroff_noirq = genpd_poweroff_noirq;
	genpd->domain.ops.restore_noirq = genpd_restore_noirq;
	genpd->domain.ops.complete = genpd_complete;
	genpd->domain.start = genpd_dev_pm_start;

	if (genpd->flags & GENPD_FLAG_PM_CLK) {
		genpd->dev_ops.stop = pm_clk_suspend;
		genpd->dev_ops.start = pm_clk_resume;
	}

	/* Always-on domains must be powered on at initialization. */
	if ((genpd_is_always_on(genpd) || genpd_is_rpm_always_on(genpd)) &&
			!genpd_status_on(genpd))
		return -EINVAL;

	if (genpd_is_cpu_domain(genpd) &&
	    !zalloc_cpumask_var(&genpd->cpus, GFP_KERNEL))
		return -ENOMEM;

	/* Use only one "off" state if there were no states declared */
	if (genpd->state_count == 0) {
		ret = genpd_set_default_power_state(genpd);
		if (ret) {
			if (genpd_is_cpu_domain(genpd))
				free_cpumask_var(genpd->cpus);
			return ret;
		}
	} else if (!gov && genpd->state_count > 1) {
		pr_warn("%s: no governor for states\n", genpd->name);
	}

	device_initialize(&genpd->dev);
	dev_set_name(&genpd->dev, "%s", genpd->name);

	mutex_lock(&gpd_list_lock);
	list_add(&genpd->gpd_list_node, &gpd_list);
	mutex_unlock(&gpd_list_lock);
	genpd_debug_add(genpd);

	return 0;
}