D60099.1793590531.diff
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	diff --git a/FreeBSD/sys/arm64/arm64/busdma_bounce.c b/FreeBSD/sys/arm64/arm64/busdma_bounce.c
	--- a/FreeBSD/sys/arm64/arm64/busdma_bounce.c
	+++ b/FreeBSD/sys/arm64/arm64/busdma_bounce.c
	@@ -1095,14 +1095,20 @@
	if (op == BUS_DMASYNC_POSTWRITE)
	return;

	+ if (map == NULL) {
	+ if ((op & BUS_DMASYNC_POSTREAD) != 0)
	+ dmb(oshld);
	+ if ((op & (BUS_DMASYNC_PREREAD \| BUS_DMASYNC_PREWRITE)) != 0)
	+ dmb(oshst);
	+ return;
	+ }
	+
	if ((op & BUS_DMASYNC_POSTREAD) != 0) {
	/*
	* Wait for any DMA operations to complete before the bcopy.
	*/
	dsb(sy);
	}
	- if (map == NULL)
	- goto out;

	if ((bpage = STAILQ_FIRST(&map->bpages)) != NULL) {
	CTR4(KTR_BUSDMA, "%s: tag %p tag flags 0x%x op 0x%x "
	@@ -1173,7 +1179,6 @@
	dma_dcache_sync(sl, op);
	}

	-out:
	if ((op & (BUS_DMASYNC_PREREAD \| BUS_DMASYNC_PREWRITE)) != 0) {
	/*
	* Wait for the bcopy to complete before any DMA operations.