DMAMAP_MBUF
map->flags &= ~DMAMAP_MBUF;
if (map->flags & (DMAMAP_DMAMEM_ALLOC | DMAMAP_COHERENT | DMAMAP_MBUF))
map->flags |= DMAMAP_MBUF;
(DMAMAP_FROM_DMAMEM | DMAMAP_COHERENT | DMAMAP_MBUF)
map->flags |= DMAMAP_MBUF;
map->flags &= ~DMAMAP_MBUF;