mac80211: Add capability to enable/disable beaconing

This patch adds a flag to notify drivers to start and stop
beaconing when needed, for example, during a scan run. Based
on Sujith's first patch to do the same, but now disables
beaconing for all virtual interfaces while scanning, has a
separate change flag and tracks user-space requests.

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

1 files changed, 11 insertions, 7 deletions

diff --git a/net/mac80211/scan.c b/net/mac80211/scan.c
index a2caeed57f4e..8248d7b6ae82 100644
--- a/net/mac80211/scan.c
+++ b/net/mac80211/scan.c
@@ -20,6 +20,7 @@
 
 #include <linux/wireless.h>
 #include <linux/if_arp.h>
+#include <linux/rtnetlink.h>
 #include <net/mac80211.h>
 #include <net/iw_handler.h>
 
@@ -472,8 +473,8 @@ void ieee80211_scan_completed(struct ieee80211_hw *hw)
         netif_addr_unlock(local->mdev);
         netif_tx_unlock_bh(local->mdev);
 
-        rcu_read_lock();
-        list_for_each_entry_rcu(sdata, &local->interfaces, list) {
+        mutex_lock(&local->iflist_mtx);
+        list_for_each_entry(sdata, &local->interfaces, list) {
                 /* Tell AP we're back */
                 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
                         if (sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED) {
@@ -482,8 +483,10 @@ void ieee80211_scan_completed(struct ieee80211_hw *hw)
                         }
                 } else
                         netif_tx_wake_all_queues(sdata->dev);
+
+                ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON_ENABLED);
         }
-        rcu_read_unlock();
+        mutex_unlock(&local->iflist_mtx);
 
  done:
         ieee80211_mlme_notify_scan_completed(local);
@@ -491,7 +494,6 @@ void ieee80211_scan_completed(struct ieee80211_hw *hw)
 }
 EXPORT_SYMBOL(ieee80211_scan_completed);
 
-
 void ieee80211_scan_work(struct work_struct *work)
 {
         struct ieee80211_local *local =
@@ -633,8 +635,10 @@ int ieee80211_start_scan(struct ieee80211_sub_if_data *scan_sdata,
 
         local->sw_scanning = true;
 
-        rcu_read_lock();
-        list_for_each_entry_rcu(sdata, &local->interfaces, list) {
+        mutex_lock(&local->iflist_mtx);
+        list_for_each_entry(sdata, &local->interfaces, list) {
+                ieee80211_if_config(sdata, IEEE80211_IFCC_BEACON_ENABLED);
+
                 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
                         if (sdata->u.sta.flags & IEEE80211_STA_ASSOCIATED) {
                                 netif_tx_stop_all_queues(sdata->dev);
@@ -643,7 +647,7 @@ int ieee80211_start_scan(struct ieee80211_sub_if_data *scan_sdata,
                 } else
                         netif_tx_stop_all_queues(sdata->dev);
         }
-        rcu_read_unlock();
+        mutex_unlock(&local->iflist_mtx);
 
         if (ssid) {
                 local->scan_ssid_len = ssid_len;