int cpuidle_add_sysfs()

in sysfs.c [690:727]

• 23 lines of code
• 4 McCabe index (conditional complexity)

int cpuidle_add_sysfs(struct cpuidle_device *dev)
{
	struct cpuidle_device_kobj *kdev;
	struct device *cpu_dev = get_cpu_device((unsigned long)dev->cpu);
	int error;

	/*
	 * Return if cpu_device is not setup for this CPU.
	 *
	 * This could happen if the arch did not set up cpu_device
	 * since this CPU is not in cpu_present mask and the
	 * driver did not send a correct CPU mask during registration.
	 * Without this check we would end up passing bogus
	 * value for &cpu_dev->kobj in kobject_init_and_add()
	 */
	if (!cpu_dev)
		return -ENODEV;

	kdev = kzalloc(sizeof(*kdev), GFP_KERNEL);
	if (!kdev)
		return -ENOMEM;
	kdev->dev = dev;

	init_completion(&kdev->kobj_unregister);

	error = kobject_init_and_add(&kdev->kobj, &ktype_cpuidle, &cpu_dev->kobj,
				   "cpuidle");
	if (error) {
		kobject_put(&kdev->kobj);
		kfree(kdev);
		return error;
	}

	dev->kobj_dev = kdev;
	kobject_uevent(&kdev->kobj, KOBJ_ADD);

	return 0;
}