int cpuidle_coupled_register_device()

in coupled.c [642:680]

• 29 lines of code
• 6 McCabe index (conditional complexity)

int cpuidle_coupled_register_device(struct cpuidle_device *dev)
{
	int cpu;
	struct cpuidle_device *other_dev;
	call_single_data_t *csd;
	struct cpuidle_coupled *coupled;

	if (cpumask_empty(&dev->coupled_cpus))
		return 0;

	for_each_cpu(cpu, &dev->coupled_cpus) {
		other_dev = per_cpu(cpuidle_devices, cpu);
		if (other_dev && other_dev->coupled) {
			coupled = other_dev->coupled;
			goto have_coupled;
		}
	}

	/* No existing coupled info found, create a new one */
	coupled = kzalloc(sizeof(struct cpuidle_coupled), GFP_KERNEL);
	if (!coupled)
		return -ENOMEM;

	coupled->coupled_cpus = dev->coupled_cpus;

have_coupled:
	dev->coupled = coupled;
	if (WARN_ON(!cpumask_equal(&dev->coupled_cpus, &coupled->coupled_cpus)))
		coupled->prevent++;

	cpuidle_coupled_update_online_cpus(coupled);

	coupled->refcnt++;

	csd = &per_cpu(cpuidle_coupled_poke_cb, dev->cpu);
	INIT_CSD(csd, cpuidle_coupled_handle_poke, (void *)(unsigned long)dev->cpu);

	return 0;
}