int cpuidle_enable_device()

in cpuidle.c [497:540]

• 31 lines of code
• 9 McCabe index (conditional complexity)

int cpuidle_enable_device(struct cpuidle_device *dev)
{
	int ret;
	struct cpuidle_driver *drv;

	if (!dev)
		return -EINVAL;

	if (dev->enabled)
		return 0;

	if (!cpuidle_curr_governor)
		return -EIO;

	drv = cpuidle_get_cpu_driver(dev);

	if (!drv)
		return -EIO;

	if (!dev->registered)
		return -EINVAL;

	ret = cpuidle_add_device_sysfs(dev);
	if (ret)
		return ret;

	if (cpuidle_curr_governor->enable) {
		ret = cpuidle_curr_governor->enable(drv, dev);
		if (ret)
			goto fail_sysfs;
	}

	smp_wmb();

	dev->enabled = 1;

	enabled_devices++;
	return 0;

fail_sysfs:
	cpuidle_remove_device_sysfs(dev);

	return ret;
}