static uint64_t ehci_opreg_read(void *ptr, hwaddr addr,
                                unsigned size)
{
    EHCIState *s = ptr;
    uint32_t val;

    switch (addr) {
    case FRINDEX:
        /* Round down to mult of 8, else it can go backwards on migration */
        val = s->frindex & ~7;
        break;
    default:
        val = s->opreg[addr >> 2];
    }

    trace_usb_ehci_opreg_read(addr + s->opregbase, addr2str(addr), val);
    return val;
}

The product does not release a resource after its effective lifetime has ended, i.e., after the resource is no longer needed.