D55314.diff
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	diff --git a/sys/powerpc/powerpc/busdma_machdep.c b/sys/powerpc/powerpc/busdma_machdep.c
	--- a/sys/powerpc/powerpc/busdma_machdep.c
	+++ b/sys/powerpc/powerpc/busdma_machdep.c
	@@ -71,15 +71,24 @@
	bus_size_t maxsegsz, int flags, bus_dma_lock_t *lockfunc,
	void lockfuncarg, bus_dma_tag_t dmat)
	{
	+ struct bus_dma_tag_common *tc;
	+ int error;

	/* Filters are no longer supported. */
	if (filter != NULL \|\| filterarg != NULL)
	return (EINVAL);

	-
	- return bus_dma_bounce_impl.tag_create(parent, alignment,
	- boundary, lowaddr, highaddr, maxsize, nsegments,
	- maxsegsz, flags, lockfunc, lockfuncarg, dmat);
	+ if (parent == NULL) {
	+ error = bus_dma_bounce_impl.tag_create(parent, alignment,
	+ boundary, lowaddr, highaddr, maxsize, nsegments, maxsegsz,
	+ flags, lockfunc, lockfuncarg, dmat);
	+ } else {
	+ tc = (struct bus_dma_tag_common *)parent;
	+ error = tc->impl->tag_create(parent, alignment,
	+ boundary, lowaddr, highaddr, maxsize, nsegments, maxsegsz,
	+ flags, lockfunc, lockfuncarg, dmat);
	+ }
	+ return (error);
	}