RT2560_PRIO_RING_COUNT
sc->prioq.next = (sc->prioq.next + 1) % RT2560_PRIO_RING_COUNT;
if (sc->prioq.queued < RT2560_PRIO_RING_COUNT)
sc->prioq.cur = (sc->prioq.cur + 1) % RT2560_PRIO_RING_COUNT;
sc->prioq.cur = (sc->prioq.cur + 1) % RT2560_PRIO_RING_COUNT;
error = rt2560_alloc_tx_ring(sc, &sc->prioq, RT2560_PRIO_RING_COUNT);
tmp = RT2560_PRIO_RING_COUNT << 24 |
if (sc->prioq.queued >= RT2560_PRIO_RING_COUNT) {