dma_getnexttxp
p = dma_getnexttxp(wlc->hw->di[queue],
p = dma_getnexttxp(wlc->hw->di[queue], DMA_RANGE_TRANSMITTED);
while ((p = dma_getnexttxp(pub, range))) {
struct sk_buff *dma_getnexttxp(struct dma_pub *pub, enum txd_range range);
p = dma_getnexttxp(wlc->hw->di[queue], DMA_RANGE_TRANSMITTED);