[MAC80211]: implement ERP info change notifications

zd1211rw and bcm43xx are interested in being notified when ERP IE conditions
change, so that they can reprogram a register which affects how control frames
are transmitted.

This patch adds an interface similar to the one that can be found in softmac.

Signed-off-by: Daniel Drake <dsd@gentoo.org>
Signed-off-by: Jiri Benc <jbenc@suse.cz>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 7 insertions, 3 deletions

diff --git a/net/mac80211/ieee80211_sta.c b/net/mac80211/ieee80211_sta.c
index 0f5f8131bd71..33414f160538 100644
--- a/net/mac80211/ieee80211_sta.c
+++ b/net/mac80211/ieee80211_sta.c
@@ -319,6 +319,7 @@ static void ieee80211_handle_erp_ie(struct net_device *dev, u8 erp_value)
         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
         int use_protection = (erp_value & WLAN_ERP_USE_PROTECTION) != 0;
         int preamble_mode = (erp_value & WLAN_ERP_BARKER_PREAMBLE) != 0;
+        u8 changes = 0;
 
         if (use_protection != sdata->use_protection) {
                 if (net_ratelimit()) {
@@ -329,6 +330,7 @@ static void ieee80211_handle_erp_ie(struct net_device *dev, u8 erp_value)
                                MAC_ARG(ifsta->bssid));
                 }
                 sdata->use_protection = use_protection;
+                changes |= IEEE80211_ERP_CHANGE_PROTECTION;
         }
 
         if (!preamble_mode != sdata->short_preamble) {
@@ -341,7 +343,11 @@ static void ieee80211_handle_erp_ie(struct net_device *dev, u8 erp_value)
                                MAC_ARG(ifsta->bssid));
                 }
                 sdata->short_preamble = !preamble_mode;
+                changes |= IEEE80211_ERP_CHANGE_PREAMBLE;
         }
+
+        if (changes)
+                ieee80211_erp_info_change_notify(dev, changes);
 }
 
 
@@ -400,7 +406,6 @@ static void ieee80211_set_associated(struct net_device *dev,
                                      struct ieee80211_if_sta *ifsta, int assoc)
 {
         union iwreq_data wrqu;
-        struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 
         if (ifsta->associated == assoc)
                 return;
@@ -428,8 +433,7 @@ static void ieee80211_set_associated(struct net_device *dev,
                 ieee80211_sta_send_associnfo(dev, ifsta);
         } else {
                 netif_carrier_off(dev);
-                sdata->short_preamble = 0;
-                sdata->use_protection = 0;
+                ieee80211_reset_erp_info(dev);
                 memset(wrqu.ap_addr.sa_data, 0, ETH_ALEN);
         }
         wrqu.ap_addr.sa_family = ARPHRD_ETHER;