sbdma_add_rcvbuffer
if (sbdma_add_rcvbuffer(sc, d, NULL) != 0)
if (unlikely(sbdma_add_rcvbuffer(sc, d, NULL) ==
sbdma_add_rcvbuffer(sc, d, sb);
sbdma_add_rcvbuffer(sc, d, sb);
static int sbdma_add_rcvbuffer(struct sbmac_softc *sc, struct sbmacdma *d,