D3012.id6749.diff
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	Index: sys/sys/bus_dma.h
	===================================================================
	--- sys/sys/bus_dma.h
	+++ sys/sys/bus_dma.h
	@@ -282,13 +282,17 @@
	void bus_dmamem_free(bus_dma_tag_t dmat, void *vaddr, bus_dmamap_t map);

	/*
	- * Perform a synchronization operation on the given map.
	+ * Perform a synchronization operation on the given map. If the map
	+ * is NULL we have a fully IO-coherent system. Place a memory barrier
	+ * then to ensure all data accesses are visible before going any further.
	*/
	void _bus_dmamap_sync(bus_dma_tag_t, bus_dmamap_t, bus_dmasync_op_t);
	#define bus_dmamap_sync(dmat, dmamap, op) \
	do { \
	if ((dmamap) != NULL) \
	_bus_dmamap_sync(dmat, dmamap, op); \
	+ else \
	+ mb(); \
	} while (0)

	/*