aac_cmd_dma_alloc
if (aac_cmd_dma_alloc(softs, acp, bp, flags, callback, arg) == AACOK)
if (aac_cmd_dma_alloc(softs, &usge->acp, bp, 0, NULL_FUNC,
extern int aac_cmd_dma_alloc(struct aac_softstate *, struct aac_cmd *,