ath9k: Add support FIF_OTHER_BSS filtering mode.

Support for FIF_OTHER_BSS was missing.  This patch adds support for this
filtering mode which in turn resolves a problem where mesh interfaces would not
receive broadcast traffic.
Signed-off-by: NJavier Cardona <javier@cozybit.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/ath9k/recv.c

@@ -423,11 +423,12 @@ u32 ath_calcrxfilter(struct ath_softc *sc)
 	if (sc->rx.rxfilter & FIF_PSPOLL)
 		rfilt |= ATH9K_RX_FILTER_PSPOLL;
 
-	if (sc->sec_wiphy) {
+	if (sc->sec_wiphy || (sc->rx.rxfilter & FIF_OTHER_BSS)) {
 		/* TODO: only needed if more than one BSSID is in use in
 		 * station/adhoc mode */
-		/* TODO: for older chips, may need to add ATH9K_RX_FILTER_PROM
-		 */
+		/* The following may also be needed for other older chips */
+		if (sc->sc_ah->hw_version.macVersion == AR_SREV_VERSION_9160)
+			rfilt |= ATH9K_RX_FILTER_PROM;
 		rfilt |= ATH9K_RX_FILTER_MCAST_BCAST_ALL;
 	}