ath5k: always extend rx timestamp with tsf

always extend the rx timestamp with the local TSF, since this information is
also needed for proper IBSS merging. this is done in the tasklet for now, maybe
has to be moved to the interrupt handler like in madwifi.

drivers/net/wireless/ath5k/base.c:      Changes-licensed-under: 3-Clause-BSD
Signed-off-by: Bruno Randolf <bruno@thinktube.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath5k/base.c

@@ -1775,11 +1775,18 @@ ath5k_tasklet_rx(unsigned long data)
 			skb_pull(skb, pad);
 		}
 
-		if (sc->opmode == IEEE80211_IF_TYPE_MNTR)
-			rxs.mactime = ath5k_extend_tsf(sc->ah,
-					ds->ds_rxstat.rs_tstamp);
-		else
-			rxs.mactime = ds->ds_rxstat.rs_tstamp;
+		/*
+		 * always extend the mac timestamp, since this information is
+		 * also needed for proper IBSS merging.
+		 *
+		 * XXX: it might be too late to do it here, since rs_tstamp is
+		 * 15bit only. that means TSF extension has to be done within
+		 * 32768usec (about 32ms). it might be necessary to move this to
+		 * the interrupt handler, like it is done in madwifi.
+		 */
+		rxs.mactime = ath5k_extend_tsf(sc->ah, ds->ds_rxstat.rs_tstamp);
+		rxs.flag |= RX_FLAG_TSFT;
+
 		rxs.freq = sc->curchan->freq;
 		rxs.channel = sc->curchan->chan;
 		rxs.phymode = sc->curmode;