static int vhost_vsock_dev_open()

in vsock.c [661:702]

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

static int vhost_vsock_dev_open(struct inode *inode, struct file *file)
{
	struct vhost_virtqueue **vqs;
	struct vhost_vsock *vsock;
	int ret;

	/* This struct is large and allocation could fail, fall back to vmalloc
	 * if there is no other way.
	 */
	vsock = kvmalloc(sizeof(*vsock), GFP_KERNEL | __GFP_RETRY_MAYFAIL);
	if (!vsock)
		return -ENOMEM;

	vqs = kmalloc_array(ARRAY_SIZE(vsock->vqs), sizeof(*vqs), GFP_KERNEL);
	if (!vqs) {
		ret = -ENOMEM;
		goto out;
	}

	vsock->guest_cid = 0; /* no CID assigned yet */

	atomic_set(&vsock->queued_replies, 0);

	vqs[VSOCK_VQ_TX] = &vsock->vqs[VSOCK_VQ_TX];
	vqs[VSOCK_VQ_RX] = &vsock->vqs[VSOCK_VQ_RX];
	vsock->vqs[VSOCK_VQ_TX].handle_kick = vhost_vsock_handle_tx_kick;
	vsock->vqs[VSOCK_VQ_RX].handle_kick = vhost_vsock_handle_rx_kick;

	vhost_dev_init(&vsock->dev, vqs, ARRAY_SIZE(vsock->vqs),
		       UIO_MAXIOV, VHOST_VSOCK_PKT_WEIGHT,
		       VHOST_VSOCK_WEIGHT, true, NULL);

	file->private_data = vsock;
	spin_lock_init(&vsock->send_pkt_list_lock);
	INIT_LIST_HEAD(&vsock->send_pkt_list);
	vhost_work_init(&vsock->send_pkt_work, vhost_transport_send_pkt_work);
	return 0;

out:
	vhost_vsock_free(vsock);
	return ret;
}