D54841.diff
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	diff --git a/sys/compat/linuxkpi/common/src/linux_pci.c b/sys/compat/linuxkpi/common/src/linux_pci.c
	--- a/sys/compat/linuxkpi/common/src/linux_pci.c
	+++ b/sys/compat/linuxkpi/common/src/linux_pci.c
	@@ -1720,9 +1720,26 @@
	}
	LINUX_DMA_PCTRIE_REMOVE(&priv->ptree, dma_addr);

	- if ((attrs & DMA_ATTR_SKIP_CPU_SYNC) == 0)
	- dma_sync_single_for_cpu(dev, dma_addr, len, direction);
	+ if ((attrs & DMA_ATTR_SKIP_CPU_SYNC) != 0)
	+ goto skip_sync;

	+ /* dma_sync_single_for_cpu() unrolled to avoid lock recursicn. */
	+ switch (direction) {
	+ case DMA_BIDIRECTIONAL:
	+ bus_dmamap_sync(obj->dmat, obj->dmamap, BUS_DMASYNC_POSTREAD);
	+ bus_dmamap_sync(obj->dmat, obj->dmamap, BUS_DMASYNC_PREREAD);
	+ break;
	+ case DMA_TO_DEVICE:
	+ bus_dmamap_sync(obj->dmat, obj->dmamap, BUS_DMASYNC_POSTWRITE);
	+ break;
	+ case DMA_FROM_DEVICE:
	+ bus_dmamap_sync(obj->dmat, obj->dmamap, BUS_DMASYNC_POSTREAD);
	+ break;
	+ default:
	+ break;
	+ }
	+
	+skip_sync:
	bus_dmamap_unload(obj->dmat, obj->dmamap);
	bus_dmamap_destroy(obj->dmat, obj->dmamap);
	DMA_PRIV_UNLOCK(priv);