static void xhci_port_reset(XHCIPort *port, bool warm_reset)
{
    trace_usb_xhci_port_reset(port->portnr, warm_reset);

    if (!xhci_port_have_device(port)) {
        return;
    }

    usb_device_reset(port->uport->dev);

    switch (port->uport->dev->speed) {
    case USB_SPEED_SUPER:
        if (warm_reset) {
            port->portsc |= PORTSC_WRC;
        }
        /* fall through */
    case USB_SPEED_LOW:
    case USB_SPEED_FULL:
    case USB_SPEED_HIGH:
        set_field(&port->portsc, PLS_U0, PORTSC_PLS);
        trace_usb_xhci_port_link(port->portnr, PLS_U0);
        port->portsc |= PORTSC_PED;
        break;
    }

    port->portsc &= ~PORTSC_PR;
    xhci_port_notify(port, PORTSC_PRC);
}

The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop.