rt2x00: Pass BlockAck and BlackAckReq frames to mac80211 in monitor mode

Previously BlockAcks were always dropped by the rt2800 hardware while
BlockAckReqs were always accepted. However, both are only useful on
monitor interfaces at the moment and both are control frames. So
pass them up when mac80211 sets FIF_CONTROL.
Signed-off-by: NHelmut Schaa <helmut.schaa@googlemail.com>
Acked-by: NGertjan van Wingerde <gwingerde@gmail.com>
Acked-by: NIvo van Doorn <IvDoorn@gmail.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/rt2x00/rt2800lib.c

@@ -1203,8 +1203,10 @@ void rt2800_config_filter(struct rt2x00_dev *rt2x00dev,
 			   !(filter_flags & FIF_CONTROL));
 	rt2x00_set_field32(&reg, RX_FILTER_CFG_DROP_PSPOLL,
 			   !(filter_flags & FIF_PSPOLL));
-	rt2x00_set_field32(&reg, RX_FILTER_CFG_DROP_BA, 1);
-	rt2x00_set_field32(&reg, RX_FILTER_CFG_DROP_BAR, 0);
+	rt2x00_set_field32(&reg, RX_FILTER_CFG_DROP_BA,
+			   !(filter_flags & FIF_CONTROL));
+	rt2x00_set_field32(&reg, RX_FILTER_CFG_DROP_BAR,
+			   !(filter_flags & FIF_CONTROL));
 	rt2x00_set_field32(&reg, RX_FILTER_CFG_DROP_CNTL,
 			   !(filter_flags & FIF_CONTROL));
 	rt2800_register_write(rt2x00dev, RX_FILTER_CFG, reg);