Index: sys/dev/pci/if_iwn.c
===================================================================
RCS file: /cvsroot/src/sys/dev/pci/if_iwn.c,v
retrieving revision 1.18
diff -u -p -u -r1.18 if_iwn.c
--- sys/dev/pci/if_iwn.c	14 Sep 2008 10:09:39 -0000	1.18
+++ sys/dev/pci/if_iwn.c	23 Sep 2008 12:57:46 -0000
@@ -536,6 +536,8 @@ iwn_setup_beacon(struct iwn_softc *sc, s
 	IWN_SET_DESC_SEG(desc, 1,  data->map->dm_segs[0].ds_addr,
 	    data->map->dm_segs[1].ds_len);
 
+	bus_dmamap_sync(sc->sc_dmat, data->map, 0,
+	    data->map->dm_mapsize /* calc? */, BUS_DMASYNC_PREWRITE);
 
 	/* kick cmd ring */
 	ring->cur = (ring->cur + 1) % IWN_TX_RING_COUNT;
@@ -2125,6 +2127,9 @@ iwn_tx_data(struct iwn_softc *sc, struct
 
 	ring->queued++;
 
+	bus_dmamap_sync(sc->sc_dmat, data->map, 0,
+	    data->map->dm_mapsize /* calc? */, BUS_DMASYNC_PREWRITE);
+
 	/* kick ring */
 	ring->cur = (ring->cur + 1) % IWN_TX_RING_COUNT;
 	IWN_WRITE(sc, IWN_TX_WIDX, ring->qid << 8 | ring->cur);
@@ -2480,6 +2485,9 @@ iwn_cmd(struct iwn_softc *sc, int code, 
 		    htole16(8);
 	}
 
+	bus_dmamap_sync(sc->sc_dmat, ring->cmd_dma.map, 0,
+	    4 + size, BUS_DMASYNC_PREWRITE);
+
 	/* kick cmd ring */
 	ring->cur = (ring->cur + 1) % IWN_TX_RING_COUNT;
 	IWN_WRITE(sc, IWN_TX_WIDX, ring->qid << 8 | ring->cur);
@@ -3485,6 +3493,9 @@ iwn_scan(struct iwn_softc *sc, uint16_t 
 		    htole16(8);
 	}
 
+	bus_dmamap_sync(sc->sc_dmat, data->map, 0,
+	    data->map->dm_mapsize /* pktlen? */, BUS_DMASYNC_PREWRITE);
+
 	/* kick cmd ring */
 	ring->cur = (ring->cur + 1) % IWN_TX_RING_COUNT;
 	IWN_WRITE(sc, IWN_TX_WIDX, ring->qid << 8 | ring->cur);