Index: head/sys/mips/mips/busdma_machdep.c
===================================================================
--- head/sys/mips/mips/busdma_machdep.c
+++ head/sys/mips/mips/busdma_machdep.c
@@ -156,8 +156,6 @@
 	bus_dma_tag_t	dmat;
 	struct memdesc	mem;
 	int		flags;
-	void		*origbuffer;
-	void		*allocbuffer;
 	TAILQ_ENTRY(bus_dmamap)	freelist;
 	STAILQ_ENTRY(bus_dmamap) links;
 	bus_dmamap_callback_t *callback;
@@ -205,11 +203,8 @@
 
 	dmat->map_count++;
 
+	bzero(map, sizeof(*map));
 	map->dmat = dmat;
-	map->flags = 0;
-	map->slist = NULL;
-	map->allocbuffer = NULL;
-	map->sync_count = 0;
 	STAILQ_INIT(&map->bpages);
 
 	return (0);