void usb_claim_port(USBDevice *dev, Error **errp) { USBBus *bus = usb_bus_from_device(dev); USBPort *port; assert(dev->port == NULL); if (dev->port_path) { QTAILQ_FOREACH(port, &bus->free, next) { if (strcmp(port->path, dev->port_path) == 0) { break; } } if (port == NULL) { error_setg(errp, "usb port %s (bus %s) not found (in use?)", dev->port_path, bus->qbus.name); return; } } else { if (bus->nfree == 1 && strcmp(object_get_typename(OBJECT(dev)), "usb-hub") != 0) { /* Create a new hub and chain it on */ usb_create_simple(bus, "usb-hub"); } if (bus->nfree == 0) { error_setg(errp, "tried to attach usb device %s to a bus " "with no free ports", dev->product_desc); return; } port = QTAILQ_FIRST(&bus->free); } trace_usb_port_claim(bus->busnr, port->path); QTAILQ_REMOVE(&bus->free, port, next); bus->nfree--; dev->port = port; port->dev = dev; QTAILQ_INSERT_TAIL(&bus->used, port, next); bus->nused++; }