TAILQ_FOREACH
TAILQ_FOREACH(scb, &ahd->scb_data.free_scbs, links.tqe) {
TAILQ_FOREACH(scb, &ahd->scb_data.free_scbs, links.tqe) {
TAILQ_FOREACH(scb, &ahd->scb_data.free_scbs, links.tqe) {
TAILQ_FOREACH(scb, untagged_q, links.tqe) {