mac80211: revamp beacon configuration

This patch changes mac80211's beacon configuration handling
to never pass skbs to the driver directly but rather always
require the driver to use ieee80211_beacon_get(). Additionally,
it introduces "change flags" on the config_interface() call
to enable drivers to figure out what is changing. Finally, it
removes the beacon_update() driver callback in favour of
having IBSS beacon delivered by ieee80211_beacon_get() as well.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 17 insertions, 28 deletions

diff --git a/drivers/net/wireless/b43legacy/main.c b/drivers/net/wireless/b43legacy/main.c
index 069157eea05..a1b8bf3ee73 100644
--- a/drivers/net/wireless/b43legacy/main.c
+++ b/drivers/net/wireless/b43legacy/main.c
@@ -1138,14 +1138,22 @@ static void b43legacy_write_probe_resp_template(struct b43legacy_wldev *dev,
 
 /* Asynchronously update the packet templates in template RAM.
  * Locking: Requires wl->irq_lock to be locked. */
-static void b43legacy_update_templates(struct b43legacy_wl *wl,
-				       struct sk_buff *beacon)
+static void b43legacy_update_templates(struct b43legacy_wl *wl)
 {
+	struct sk_buff *beacon;
 	/* This is the top half of the ansynchronous beacon update. The bottom
 	 * half is the beacon IRQ. Beacon update must be asynchronous to avoid
 	 * sending an invalid beacon. This can happen for example, if the
 	 * firmware transmits a beacon while we are updating it. */
 
+	/* We could modify the existing beacon and set the aid bit in the TIM
+	 * field, but that would probably require resizing and moving of data
+	 * within the beacon template. Simply request a new beacon and let
+	 * mac80211 do the hard work. */
+	beacon = ieee80211_beacon_get(wl->hw, wl->vif);
+	if (unlikely(!beacon))
+		return;
+
 	if (wl->current_beacon)
 		dev_kfree_skb_any(wl->current_beacon);
 	wl->current_beacon = beacon;
@@ -2727,10 +2735,13 @@ static int b43legacy_op_config_interface(struct ieee80211_hw *hw,
 		memset(wl->bssid, 0, ETH_ALEN);
 	if (b43legacy_status(dev) >= B43legacy_STAT_INITIALIZED) {
 		if (b43legacy_is_mode(wl, IEEE80211_IF_TYPE_AP)) {
-			B43legacy_WARN_ON(conf->type != IEEE80211_IF_TYPE_AP);
+			B43legacy_WARN_ON(vif->type != IEEE80211_IF_TYPE_AP);
 			b43legacy_set_ssid(dev, conf->ssid, conf->ssid_len);
-			if (conf->beacon)
-				b43legacy_update_templates(wl, conf->beacon);
+			if (conf->changed & IEEE80211_IFCC_BEACON)
+				b43legacy_update_templates(wl);
+		} else if (b43legacy_is_mode(wl, IEEE80211_IF_TYPE_IBSS)) {
+			if (conf->changed & IEEE80211_IFCC_BEACON)
+				b43legacy_update_templates(wl);
 		}
 		b43legacy_write_mac_bssid_templates(dev);
 	}
@@ -3396,31 +3407,10 @@ static int b43legacy_op_beacon_set_tim(struct ieee80211_hw *hw,
 				       int aid, int set)
 {
 	struct b43legacy_wl *wl = hw_to_b43legacy_wl(hw);
-	struct sk_buff *beacon;
-	unsigned long flags;
-
-	/* We could modify the existing beacon and set the aid bit in the TIM
-	 * field, but that would probably require resizing and moving of data
-	 * within the beacon template. Simply request a new beacon and let
-	 * mac80211 do the hard work. */
-	beacon = ieee80211_beacon_get(hw, wl->vif);
-	if (unlikely(!beacon))
-		return -ENOMEM;
-	spin_lock_irqsave(&wl->irq_lock, flags);
-	b43legacy_update_templates(wl, beacon);
-	spin_unlock_irqrestore(&wl->irq_lock, flags);
-
-	return 0;
-}
-
-static int b43legacy_op_ibss_beacon_update(struct ieee80211_hw *hw,
-					   struct sk_buff *beacon)
-{
-	struct b43legacy_wl *wl = hw_to_b43legacy_wl(hw);
 	unsigned long flags;
 
 	spin_lock_irqsave(&wl->irq_lock, flags);
-	b43legacy_update_templates(wl, beacon);
+	b43legacy_update_templates(wl);
 	spin_unlock_irqrestore(&wl->irq_lock, flags);
 
 	return 0;
@@ -3440,7 +3430,6 @@ static const struct ieee80211_ops b43legacy_hw_ops = {
 	.stop			= b43legacy_op_stop,
 	.set_retry_limit	= b43legacy_op_set_retry_limit,
 	.set_tim		= b43legacy_op_beacon_set_tim,
-	.beacon_update		= b43legacy_op_ibss_beacon_update,
 };
 
 /* Hard-reset the chip. Do not call this directly.