static long counter_chrdev_ioctl()

in counter-chrdev.c [348:378]

• 26 lines of code
• 5 McCabe index (conditional complexity)

static long counter_chrdev_ioctl(struct file *filp, unsigned int cmd,
				 unsigned long arg)
{
	struct counter_device *const counter = filp->private_data;
	int ret = -ENODEV;

	mutex_lock(&counter->ops_exist_lock);

	if (!counter->ops)
		goto out_unlock;

	switch (cmd) {
	case COUNTER_ADD_WATCH_IOCTL:
		ret = counter_add_watch(counter, arg);
		break;
	case COUNTER_ENABLE_EVENTS_IOCTL:
		ret = counter_enable_events(counter);
		break;
	case COUNTER_DISABLE_EVENTS_IOCTL:
		ret = counter_disable_events(counter);
		break;
	default:
		ret = -ENOIOCTLCMD;
		break;
	}

out_unlock:
	mutex_unlock(&counter->ops_exist_lock);

	return ret;
}