D8717.diff
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	Index: head/sys/dev/iwn/if_iwn.c
	===================================================================
	--- head/sys/dev/iwn/if_iwn.c
	+++ head/sys/dev/iwn/if_iwn.c
	@@ -1910,6 +1910,9 @@
	goto fail;
	}

	+ bus_dmamap_sync(ring->data_dmat, data->map,
	+ BUS_DMASYNC_PREREAD);
	+
	/* Set physical address of RX buffer (256-byte aligned). */
	ring->desc[i] = htole32(paddr >> 8);
	}
	@@ -3040,14 +3043,19 @@
	if (error != 0 && error != EFBIG) {
	panic("%s: could not load old RX mbuf", __func__);
	}
	+ bus_dmamap_sync(ring->data_dmat, data->map,
	+ BUS_DMASYNC_PREREAD);
	/* Physical address may have changed. */
	ring->desc[ring->cur] = htole32(paddr >> 8);
	- bus_dmamap_sync(ring->data_dmat, ring->desc_dma.map,
	+ bus_dmamap_sync(ring->desc_dma.tag, ring->desc_dma.map,
	BUS_DMASYNC_PREWRITE);
	counter_u64_add(ic->ic_ierrors, 1);
	return;
	}

	+ bus_dmamap_sync(ring->data_dmat, data->map,
	+ BUS_DMASYNC_PREREAD);
	+
	m = data->m;
	data->m = m1;
	/* Update RX descriptor. */