int register_dca_provider()

in dca-core.c [340:390]

• 44 lines of code
• 7 McCabe index (conditional complexity)

int register_dca_provider(struct dca_provider *dca, struct device *dev)
{
	int err;
	unsigned long flags;
	struct dca_domain *domain, *newdomain = NULL;

	raw_spin_lock_irqsave(&dca_lock, flags);
	if (dca_providers_blocked) {
		raw_spin_unlock_irqrestore(&dca_lock, flags);
		return -ENODEV;
	}
	raw_spin_unlock_irqrestore(&dca_lock, flags);

	err = dca_sysfs_add_provider(dca, dev);
	if (err)
		return err;

	raw_spin_lock_irqsave(&dca_lock, flags);
	domain = dca_get_domain(dev);
	if (!domain) {
		struct pci_bus *rc;

		if (dca_providers_blocked) {
			raw_spin_unlock_irqrestore(&dca_lock, flags);
			dca_sysfs_remove_provider(dca);
			unregister_dca_providers();
			return -ENODEV;
		}

		raw_spin_unlock_irqrestore(&dca_lock, flags);
		rc = dca_pci_rc_from_dev(dev);
		newdomain = dca_allocate_domain(rc);
		if (!newdomain)
			return -ENODEV;
		raw_spin_lock_irqsave(&dca_lock, flags);
		/* Recheck, we might have raced after dropping the lock */
		domain = dca_get_domain(dev);
		if (!domain) {
			domain = newdomain;
			newdomain = NULL;
			list_add(&domain->node, &dca_domains);
		}
	}
	list_add(&dca->node, &domain->dca_providers);
	raw_spin_unlock_irqrestore(&dca_lock, flags);

	blocking_notifier_call_chain(&dca_provider_chain,
				     DCA_PROVIDER_ADD, NULL);
	kfree(newdomain);
	return 0;
}