mac80211: rt2x00: fix WARN_ON_ONCE() caused by inbalanced set/clear of beacon enable bit

Signed-off-by: evaxige <evaxige@qq.com>

SVN-Revision: 47668

package/kernel/mac80211/patches/622-rt2x00-fix-beacon-bit-balance.patch

@@ -0,0 +1,47 @@
+--- a/drivers/net/wireless/rt2x00/rt2x00mac.c
++++ b/drivers/net/wireless/rt2x00/rt2x00mac.c
+@@ -632,12 +632,8 @@
+ 		} else if (bss_conf->enable_beacon && !intf->enable_beacon) {
+ 			rt2x00dev->intf_beaconing++;
+ 			intf->enable_beacon = true;
+-			/*
+-			 * Upload beacon to the H/W. This is only required on
+-			 * USB devices. PCI devices fetch beacons periodically.
+-			 */
+-			if (rt2x00_is_usb(rt2x00dev))
+-				rt2x00queue_update_beacon(rt2x00dev, vif);
++
++			rt2x00queue_update_beacon(rt2x00dev, vif);
+ 
+ 			if (rt2x00dev->intf_beaconing == 1) {
+ 				/*
+--- a/drivers/net/wireless/rt2x00/rt2x00dev.c
++++ b/drivers/net/wireless/rt2x00/rt2x00dev.c
+@@ -144,7 +144,8 @@
+ 
+ 	if (test_and_clear_bit(DELAYED_UPDATE_BEACON, &intf->delayed_flags)) {
+ 		mutex_lock(&intf->beacon_skb_mutex);
+-		rt2x00queue_update_beacon(rt2x00dev, vif);
++		if (intf->enable_beacon)
++			rt2x00queue_update_beacon(rt2x00dev, vif);
+ 		mutex_unlock(&intf->beacon_skb_mutex);
+ 	}
+ }
+@@ -207,6 +208,7 @@
+ 					struct ieee80211_vif *vif)
+ {
+ 	struct rt2x00_dev *rt2x00dev = data;
++	struct rt2x00_intf *intf = vif_to_intf(vif);
+ 
+ 	if (vif->type != NL80211_IFTYPE_AP &&
+ 	    vif->type != NL80211_IFTYPE_ADHOC &&
+@@ -220,7 +222,8 @@
+ 	 * never be called for USB devices.
+ 	 */
+ 	WARN_ON(rt2x00_is_usb(rt2x00dev));
+-	rt2x00queue_update_beacon(rt2x00dev, vif);
++	if (intf->enable_beacon)
++		rt2x00queue_update_beacon(rt2x00dev, vif);
+ }
+ 
+ void rt2x00lib_beacondone(struct rt2x00_dev *rt2x00dev)