rt2x00: Disable link tuning in AP mode

Since the link tuning is based on average RSSI values taken from all received
frames it doesn't make sense to enable it in AP mode where every associated
station provides independent RSSI values. Furthermore the legacy drivers
don't enable link tuning in AP mode as well.
Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>
Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/rt2x00/rt2x00link.c

@@ -271,11 +271,11 @@ void rt2x00link_start_tuner(struct rt2x00_dev *rt2x00dev)
 
 	/*
 	 * Link tuning should only be performed when
-	 * an active sta or master interface exists.
-	 * Single monitor mode interfaces should never have
-	 * work with link tuners.
+	 * an active sta interface exists. AP interfaces
+	 * don't need link tuning and monitor mode interfaces
+	 * should never have to work with link tuners.
 	 */
-	if (!rt2x00dev->intf_ap_count && !rt2x00dev->intf_sta_count)
+	if (!rt2x00dev->intf_sta_count)
 		return;
 
 	rt2x00link_reset_tuner(rt2x00dev, false);