mac80211: clean up beacon interval settings

We currently have two beacon interval configuration knobs:
hw.conf.beacon_int and vif.bss_info.beacon_int. This is
rather confusing, even though the former is used when we
beacon ourselves and the latter when we are associated to
an AP.

This just deprecates the hw.conf.beacon_int setting in favour
of always using vif.bss_info.beacon_int. Since it touches all
the beaconing IBSS code anyway, we can also add support for
the cfg80211 IBSS beacon interval configuration easily.

NOTE: The hw.conf.beacon_int setting is retained for now due
      to drivers still using it -- I couldn't untangle all
      drivers, some are updated in this patch.

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

6 files changed, 41 insertions, 33 deletions

diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index 5e1c230744b5..a898ccd3f2c9 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -451,18 +451,11 @@ static int ieee80211_config_beacon(struct ieee80211_sub_if_data *sdata,
          * This is a kludge. beacon interval should really be part
          * of the beacon information.
          */
-        if (params->interval && (sdata->local->hw.conf.beacon_int !=
-                                 params->interval)) {
-                sdata->local->hw.conf.beacon_int = params->interval;
-                err = ieee80211_hw_config(sdata->local,
-                                        IEEE80211_CONF_CHANGE_BEACON_INTERVAL);
-                if (err < 0)
-                        return err;
-                /*
-                 * We updated some parameter so if below bails out
-                 * it's not an error.
-                 */
-                err = 0;
+        if (params->interval &&
+            (sdata->vif.bss_conf.beacon_int != params->interval)) {
+                sdata->vif.bss_conf.beacon_int = params->interval;
+                ieee80211_bss_info_change_notify(sdata,
+                                                 BSS_CHANGED_BEACON_INT);
         }
 
         /* Need to have a beacon head if we don't have one yet */
diff --git a/net/mac80211/ibss.c b/net/mac80211/ibss.c
index 25ff583612ef..f4879dad3cd7 100644
--- a/net/mac80211/ibss.c
+++ b/net/mac80211/ibss.c
@@ -73,6 +73,7 @@ static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
         struct ieee80211_mgmt *mgmt;
         u8 *pos;
         struct ieee80211_supported_band *sband;
+        u32 bss_change;
 
         if (local->ops->reset_tsf) {
                 /* Reset own TSF to allow time synchronization work. */
@@ -92,8 +93,6 @@ static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
 
         memcpy(ifibss->bssid, bssid, ETH_ALEN);
 
-        local->hw.conf.beacon_int = beacon_int >= 10 ? beacon_int : 10;
-
         sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0;
 
         ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
@@ -101,6 +100,12 @@ static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
         local->oper_channel = chan;
         local->oper_channel_type = NL80211_CHAN_NO_HT;
         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
+
+        sdata->vif.bss_conf.beacon_int = beacon_int;
+        bss_change = BSS_CHANGED_BEACON_INT;
+        bss_change |= ieee80211_reset_erp_info(sdata);
+        ieee80211_bss_info_change_notify(sdata, bss_change);
+
         sband = local->hw.wiphy->bands[chan->band];
 
         /* Build IBSS probe response */
@@ -111,7 +116,7 @@ static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
         memset(mgmt->da, 0xff, ETH_ALEN);
         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
         memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
-        mgmt->u.beacon.beacon_int = cpu_to_le16(local->hw.conf.beacon_int);
+        mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
         mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
         mgmt->u.beacon.capab_info = cpu_to_le16(capability);
 
@@ -181,8 +186,13 @@ static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
                                     struct ieee80211_bss *bss)
 {
+        u16 beacon_int = bss->cbss.beacon_interval;
+
+        if (beacon_int < 10)
+                beacon_int = 10;
+
         __ieee80211_sta_join_ibss(sdata, bss->cbss.bssid,
-                                  bss->cbss.beacon_interval,
+                                  beacon_int,
                                   bss->cbss.channel,
                                   bss->supp_rates_len, bss->supp_rates,
                                   bss->cbss.capability,
@@ -464,9 +474,6 @@ static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
 
         sband = local->hw.wiphy->bands[ifibss->channel->band];
 
-        if (local->hw.conf.beacon_int == 0)
-                local->hw.conf.beacon_int = 100;
-
         capability = WLAN_CAPABILITY_IBSS;
 
         if (sdata->default_key)
@@ -480,7 +487,7 @@ static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
                 *pos++ = (u8) (rate / 5);
         }
 
-        __ieee80211_sta_join_ibss(sdata, bssid, local->hw.conf.beacon_int,
+        __ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
                                   ifibss->channel, sband->n_bitrates,
                                   supp_rates, capability, 0);
 }
@@ -823,6 +830,8 @@ int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
         } else
                 sdata->u.ibss.fixed_bssid = false;
 
+        sdata->vif.bss_conf.beacon_int = params->beacon_interval;
+
         sdata->u.ibss.channel = params->channel;
         sdata->u.ibss.fixed_channel = params->channel_fixed;
 
diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index e00d124e4ef7..b254879d8631 100644
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -294,9 +294,6 @@ void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 {
         struct ieee80211_local *local = sdata->local;
 
-        if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
-                return;
-
         if (!changed)
                 return;
 
@@ -305,6 +302,17 @@ void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
                                              &sdata->vif,
                                              &sdata->vif.bss_conf,
                                              changed);
+
+        /*
+         * DEPRECATED
+         *
+         * ~changed is just there to not do this at resume time
+         */
+        if (changed & BSS_CHANGED_BEACON_INT && ~changed) {
+                local->hw.conf.beacon_int = sdata->vif.bss_conf.beacon_int;
+                ieee80211_hw_config(local,
+                                    _IEEE80211_CONF_CHANGE_BEACON_INTERVAL);
+        }
 }
 
 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
@@ -971,9 +979,6 @@ int ieee80211_register_hw(struct ieee80211_hw *hw)
 
         debugfs_hw_add(local);
 
-        if (local->hw.conf.beacon_int < 10)
-                local->hw.conf.beacon_int = 100;
-
         if (local->hw.max_listen_interval == 0)
                 local->hw.max_listen_interval = 1;
 
diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index a2f5e6223059..bfd571e6f221 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -842,6 +842,7 @@ static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
                 sdata->vif.bss_conf.timestamp = bss->cbss.tsf;
                 sdata->vif.bss_conf.dtim_period = bss->dtim_period;
 
+                bss_info_changed |= BSS_CHANGED_BEACON_INT;
                 bss_info_changed |= ieee80211_handle_bss_capability(sdata,
                         bss->cbss.capability, bss->has_erp_value, bss->erp_value);
 
diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c
index 654a8e963ccb..7116220d06be 100644
--- a/net/mac80211/sta_info.c
+++ b/net/mac80211/sta_info.c
@@ -543,9 +543,8 @@ void sta_info_unlink(struct sta_info **sta)
         spin_unlock_irqrestore(&local->sta_lock, flags);
 }
 
-static inline int sta_info_buffer_expired(struct ieee80211_local *local,
-                                          struct sta_info *sta,
-                                          struct sk_buff *skb)
+static int sta_info_buffer_expired(struct sta_info *sta,
+                                   struct sk_buff *skb)
 {
         struct ieee80211_tx_info *info;
         int timeout;
@@ -556,8 +555,9 @@ static inline int sta_info_buffer_expired(struct ieee80211_local *local,
         info = IEEE80211_SKB_CB(skb);
 
         /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
-        timeout = (sta->listen_interval * local->hw.conf.beacon_int * 32 /
-                   15625) * HZ;
+        timeout = (sta->listen_interval *
+                   sta->sdata->vif.bss_conf.beacon_int *
+                   32 / 15625) * HZ;
         if (timeout < STA_TX_BUFFER_EXPIRE)
                 timeout = STA_TX_BUFFER_EXPIRE;
         return time_after(jiffies, info->control.jiffies + timeout);
@@ -577,7 +577,7 @@ static void sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
         for (;;) {
                 spin_lock_irqsave(&sta->ps_tx_buf.lock, flags);
                 skb = skb_peek(&sta->ps_tx_buf);
-                if (sta_info_buffer_expired(local, sta, skb))
+                if (sta_info_buffer_expired(sta, skb))
                         skb = __skb_dequeue(&sta->ps_tx_buf);
                 else
                         skb = NULL;
diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index 1865622003c9..29df65045fc9 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -2132,7 +2132,7 @@ struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw,
                 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
                 /* BSSID is left zeroed, wildcard value */
                 mgmt->u.beacon.beacon_int =
-                        cpu_to_le16(local->hw.conf.beacon_int);
+                        cpu_to_le16(sdata->vif.bss_conf.beacon_int);
                 mgmt->u.beacon.capab_info = 0x0; /* 0x0 for MPs */
 
                 pos = skb_put(skb, 2);