wpi_alloc_tx_ring
err = wpi_alloc_tx_ring(sc, &sc->sc_txq[i], WPI_TX_RING_COUNT,
err = wpi_alloc_tx_ring(sc, &sc->sc_cmdq, WPI_CMD_RING_COUNT, 4);
err = wpi_alloc_tx_ring(sc, &sc->sc_svcq, WPI_SVC_RING_COUNT, 5);
static int wpi_alloc_tx_ring(wpi_sc_t *, wpi_tx_ring_t *, int, int);