D27448.diff
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	Index: head/sys/x86/x86/busdma_bounce.c
	===================================================================
	--- head/sys/x86/x86/busdma_bounce.c
	+++ head/sys/x86/x86/busdma_bounce.c
	@@ -969,7 +969,7 @@
	bus_size_t datacount1, datacount2;

	if (map == NULL \|\| (bpage = STAILQ_FIRST(&map->bpages)) == NULL)
	- return;
	+ goto out;

	/*
	* Handle data bouncing. We might also want to add support for
	@@ -1059,6 +1059,8 @@
	}
	dmat->bounce_zone->total_bounced++;
	}
	+out:
	+ atomic_thread_fence_rel();
	}

	static void