int pvcalls_front_connect()

in pvcalls-front.c [412:479]

• 57 lines of code
• 8 McCabe index (conditional complexity)

int pvcalls_front_connect(struct socket *sock, struct sockaddr *addr,
				int addr_len, int flags)
{
	struct pvcalls_bedata *bedata;
	struct sock_mapping *map = NULL;
	struct xen_pvcalls_request *req;
	int notify, req_id, ret;
	evtchn_port_t evtchn;

	if (addr->sa_family != AF_INET || sock->type != SOCK_STREAM)
		return -EOPNOTSUPP;

	map = pvcalls_enter_sock(sock);
	if (IS_ERR(map))
		return PTR_ERR(map);

	bedata = dev_get_drvdata(&pvcalls_front_dev->dev);
	ret = alloc_active_ring(map);
	if (ret < 0) {
		pvcalls_exit_sock(sock);
		return ret;
	}

	spin_lock(&bedata->socket_lock);
	ret = get_request(bedata, &req_id);
	if (ret < 0) {
		spin_unlock(&bedata->socket_lock);
		free_active_ring(map);
		pvcalls_exit_sock(sock);
		return ret;
	}
	ret = create_active(map, &evtchn);
	if (ret < 0) {
		spin_unlock(&bedata->socket_lock);
		free_active_ring(map);
		pvcalls_exit_sock(sock);
		return ret;
	}

	req = RING_GET_REQUEST(&bedata->ring, req_id);
	req->req_id = req_id;
	req->cmd = PVCALLS_CONNECT;
	req->u.connect.id = (uintptr_t)map;
	req->u.connect.len = addr_len;
	req->u.connect.flags = flags;
	req->u.connect.ref = map->active.ref;
	req->u.connect.evtchn = evtchn;
	memcpy(req->u.connect.addr, addr, sizeof(*addr));

	map->sock = sock;

	bedata->ring.req_prod_pvt++;
	RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&bedata->ring, notify);
	spin_unlock(&bedata->socket_lock);

	if (notify)
		notify_remote_via_irq(bedata->irq);

	wait_event(bedata->inflight_req,
		   READ_ONCE(bedata->rsp[req_id].req_id) == req_id);

	/* read req_id, then the content */
	smp_rmb();
	ret = bedata->rsp[req_id].ret;
	bedata->rsp[req_id].req_id = PVCALLS_INVALID_ID;
	pvcalls_exit_sock(sock);
	return ret;
}