[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, 24 insertions, 1 deletions

diff --git a/net/mac80211/ieee80211.c b/net/mac80211/ieee80211.c
index f811a260ee9c..4715a9525918 100644
--- a/net/mac80211/ieee80211.c
+++ b/net/mac80211/ieee80211.c
@@ -464,8 +464,10 @@ static int ieee80211_open(struct net_device *dev)
         if (sdata->type == IEEE80211_IF_TYPE_MNTR) {
                 local->monitors++;
                 local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
-        } else
+        } else {
                 ieee80211_if_config(dev);
+                ieee80211_reset_erp_info(dev);
+        }
 
         if (sdata->type == IEEE80211_IF_TYPE_STA &&
             !local->user_space_mlme)
@@ -748,6 +750,27 @@ int ieee80211_hw_config(struct ieee80211_local *local)
         return ret;
 }
 
+void ieee80211_erp_info_change_notify(struct net_device *dev, u8 changes)
+{
+        struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
+        struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
+        if (local->ops->erp_ie_changed)
+                local->ops->erp_ie_changed(local_to_hw(local), changes,
+                                           sdata->use_protection,
+                                           !sdata->short_preamble);
+}
+
+void ieee80211_reset_erp_info(struct net_device *dev)
+{
+        struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
+
+        sdata->short_preamble = 0;
+        sdata->use_protection = 0;
+        ieee80211_erp_info_change_notify(dev,
+                                         IEEE80211_ERP_CHANGE_PROTECTION |
+                                         IEEE80211_ERP_CHANGE_PREAMBLE);
+}
+
 struct dev_mc_list *ieee80211_get_mc_list_item(struct ieee80211_hw *hw,
                                                struct dev_mc_list *prev,
                                                void **ptr)