WDCF_DMA_WAIT
chp->ch_flags |= WDCF_DMA_WAIT;
if (chp->ch_flags & WDCF_DMA_WAIT) {
chp->ch_flags &= ~WDCF_DMA_WAIT;
if (chp->ch_flags & WDCF_DMA_WAIT) {
chp->ch_flags &= ~WDCF_DMA_WAIT;
if (chp->ch_flags & WDCF_DMA_WAIT) {
chp->ch_flags &= ~WDCF_DMA_WAIT;