int usb_drv_cleanup_last_transfer(int endpoint, bool send)
{
    int pipe = endpoint * 2 + (send ? 1 : 0);
    int i=0;
    struct queue_head* qh = &qh_array[pipe];
    logf("enter usb_drv_cleanup_last_transfer");

    for(i=0;i<NUM_TRANSFER_DESCRIPTORS;i++) {
        if((td_array[i].reserved & DTD_RESERVED_PIPE_MASK)>>DTD_RESERVED_PIPE_OFFSET == pipe) {
            //td_array[i].reserved = 0;
        }
    }
    qh->first_td = DTD_NEXT_TERMINATE;
    logf("exit usb_drv_cleanup_last_transfer");
    return 0;
}