AAC_CMD_DMA_VALID
if (acp->flags & AAC_CMD_DMA_VALID) {
acp->flags &= ~AAC_CMD_DMA_VALID;
if (acp->flags & AAC_CMD_DMA_VALID) {
AAC_CMD_BUF_READ | AAC_CMD_BUF_WRITE | AAC_CMD_DMA_VALID;
if (acp->flags & AAC_CMD_DMA_VALID) {
if (bp && bp->b_bcount != 0 && !(acp->flags & AAC_CMD_DMA_VALID)) {
acp->flags |= AAC_CMD_DMA_VALID;