ntb_qp_link_work
callout_reset(&qp->link_work, 0, ntb_qp_link_work, qp);
NTB_LINK_DOWN_TIMEOUT * hz / 1000, ntb_qp_link_work, qp);
static void ntb_qp_link_work(void *arg);
callout_reset(&qp->link_work, 0, ntb_qp_link_work, qp);