rt2x00: Simplify intf->delayed_flags locking

Instead of protecting delayed_flags with a spinlock use atomic bitops to
make the code more readable.

Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>
Acked-by: Gertjan van Wingerde <gwingerde@gmail.com>
Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/rt2x00/rt2x00.h

@@ -347,6 +347,10 @@ struct link {
 	struct delayed_work watchdog_work;
 };
 
+enum rt2x00_delayed_flags {
+	DELAYED_UPDATE_BEACON,
+};
+
 /*
  * Interface structure
  * Per interface configuration details, this structure
@@ -374,8 +378,7 @@ struct rt2x00_intf {
 	/*
 	 * Actions that needed rescheduling.
 	 */
-	unsigned int delayed_flags;
-#define DELAYED_UPDATE_BEACON		0x00000001
+	unsigned long delayed_flags;
 
 	/*
 	 * Software sequence counter, this is only required

drivers/net/wireless/rt2x00/rt2x00dev.c

@@ -110,19 +110,6 @@ static void rt2x00lib_intf_scheduled_iter(void *data, u8 *mac,
 {
 	struct rt2x00_dev *rt2x00dev = data;
 	struct rt2x00_intf *intf = vif_to_intf(vif);
-	int delayed_flags;
-
-	/*
-	 * Copy all data we need during this action under the protection
-	 * of a spinlock. Otherwise race conditions might occur which results
-	 * into an invalid configuration.
-	 */
-	spin_lock(&intf->lock);
-
-	delayed_flags = intf->delayed_flags;
-	intf->delayed_flags = 0;
-
-	spin_unlock(&intf->lock);
 
 	/*
 	 * It is possible the radio was disabled while the work had been
@@ -133,7 +120,7 @@ static void rt2x00lib_intf_scheduled_iter(void *data, u8 *mac,
 	if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 		return;
 
-	if (delayed_flags & DELAYED_UPDATE_BEACON)
+	if (test_and_clear_bit(DELAYED_UPDATE_BEACON, &intf->delayed_flags))
 		rt2x00queue_update_beacon(rt2x00dev, vif, true);
 }
 

drivers/net/wireless/rt2x00/rt2x00mac.c

@@ -444,9 +444,7 @@ static void rt2x00mac_set_tim_iter(void *data, u8 *mac,
 	    vif->type != NL80211_IFTYPE_WDS)
 		return;
 
-	spin_lock(&intf->lock);
-	intf->delayed_flags |= DELAYED_UPDATE_BEACON;
-	spin_unlock(&intf->lock);
+	set_bit(DELAYED_UPDATE_BEACON, &intf->delayed_flags);
 }
 
 int rt2x00mac_set_tim(struct ieee80211_hw *hw, struct ieee80211_sta *sta,