static int vhost_process_iotlb_msg()

in vhost.c [1093:1137]

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

static int vhost_process_iotlb_msg(struct vhost_dev *dev,
				   struct vhost_iotlb_msg *msg)
{
	int ret = 0;

	mutex_lock(&dev->mutex);
	vhost_dev_lock_vqs(dev);
	switch (msg->type) {
	case VHOST_IOTLB_UPDATE:
		if (!dev->iotlb) {
			ret = -EFAULT;
			break;
		}
		if (!umem_access_ok(msg->uaddr, msg->size, msg->perm)) {
			ret = -EFAULT;
			break;
		}
		vhost_vq_meta_reset(dev);
		if (vhost_iotlb_add_range(dev->iotlb, msg->iova,
					  msg->iova + msg->size - 1,
					  msg->uaddr, msg->perm)) {
			ret = -ENOMEM;
			break;
		}
		vhost_iotlb_notify_vq(dev, msg);
		break;
	case VHOST_IOTLB_INVALIDATE:
		if (!dev->iotlb) {
			ret = -EFAULT;
			break;
		}
		vhost_vq_meta_reset(dev);
		vhost_iotlb_del_range(dev->iotlb, msg->iova,
				      msg->iova + msg->size - 1);
		break;
	default:
		ret = -EINVAL;
		break;
	}

	vhost_dev_unlock_vqs(dev);
	mutex_unlock(&dev->mutex);

	return ret;
}