7 files changed, 113 insertions, 14 deletions

diff --git a/drivers/net/wireless/mac80211_hwsim.c b/drivers/net/wireless/mac80211_hwsim.c
index 8fa6e6ce5705..b1213b6a6b9f 100644
--- a/drivers/net/wireless/mac80211_hwsim.c
+++ b/drivers/net/wireless/mac80211_hwsim.c
@@ -553,9 +553,11 @@ static int mac80211_hwsim_config(struct ieee80211_hw *hw, u32 changed)
         struct mac80211_hwsim_data *data = hw->priv;
         struct ieee80211_conf *conf = &hw->conf;
 
-        printk(KERN_DEBUG "%s:%s (freq=%d radio_enabled=%d)\n",
+        printk(KERN_DEBUG "%s:%s (freq=%d radio_enabled=%d idle=%d ps=%d)\n",
                wiphy_name(hw->wiphy), __func__,
-               conf->channel->center_freq, conf->radio_enabled);
+               conf->channel->center_freq, conf->radio_enabled,
+               !!(conf->flags & IEEE80211_CONF_IDLE),
+               !!(conf->flags & IEEE80211_CONF_PS));
 
         data->channel = conf->channel;
         data->radio_enabled = conf->radio_enabled;
diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 7806e22f4ace..38dc1cd10270 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -533,10 +533,16 @@ struct ieee80211_rx_status {
  *
  * @IEEE80211_CONF_RADIOTAP: add radiotap header at receive time (if supported)
  * @IEEE80211_CONF_PS: Enable 802.11 power save mode (managed mode only)
+ * @IEEE80211_CONF_IDLE: The device is running, but idle; if the flag is set
+ *      the driver should be prepared to handle configuration requests but
+ *      may turn the device off as much as possible. Typically, this flag will
+ *      be set when an interface is set UP but not associated or scanning, but
+ *      it can also be unset in that case when monitor interfaces are active.
  */
 enum ieee80211_conf_flags {
         IEEE80211_CONF_RADIOTAP         = (1<<0),
         IEEE80211_CONF_PS               = (1<<1),
+        IEEE80211_CONF_IDLE             = (1<<2),
 };
 
 
@@ -551,6 +557,7 @@ enum ieee80211_conf_flags {
  * @IEEE80211_CONF_CHANGE_POWER: the TX power changed
  * @IEEE80211_CONF_CHANGE_CHANNEL: the channel/channel_type changed
  * @IEEE80211_CONF_CHANGE_RETRY_LIMITS: retry limits changed
+ * @IEEE80211_CONF_CHANGE_IDLE: Idle flag changed
  */
 enum ieee80211_conf_changed {
         IEEE80211_CONF_CHANGE_RADIO_ENABLED     = BIT(0),
@@ -561,6 +568,7 @@ enum ieee80211_conf_changed {
         IEEE80211_CONF_CHANGE_POWER             = BIT(5),
         IEEE80211_CONF_CHANGE_CHANNEL           = BIT(6),
         IEEE80211_CONF_CHANGE_RETRY_LIMITS      = BIT(7),
+        IEEE80211_CONF_CHANGE_IDLE              = BIT(8),
 };
 
 static inline __deprecated enum ieee80211_conf_changed
diff --git a/net/mac80211/ibss.c b/net/mac80211/ibss.c
index a8e23232267e..aa537681f87c 100644
--- a/net/mac80211/ibss.c
+++ b/net/mac80211/ibss.c
@@ -862,6 +862,8 @@ int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
 
         sdata->u.ibss.ssid_len = params->ssid_len;
 
+        ieee80211_recalc_idle(sdata->local);
+
         set_bit(IEEE80211_IBSS_REQ_RUN, &sdata->u.ibss.request);
         queue_work(sdata->local->hw.workqueue, &sdata->u.ibss.work);
 
@@ -889,6 +891,9 @@ int ieee80211_ibss_leave(struct ieee80211_sub_if_data *sdata)
 
         skb_queue_purge(&sdata->u.ibss.skb_queue);
         memset(sdata->u.ibss.bssid, 0, ETH_ALEN);
+        sdata->u.ibss.ssid_len = 0;
+
+        ieee80211_recalc_idle(sdata->local);
 
         return 0;
 }
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 236ea098bb6c..03e0d22603c8 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -985,6 +985,8 @@ int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
                              enum nl80211_iftype type);
 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata);
 void ieee80211_remove_interfaces(struct ieee80211_local *local);
+u32 __ieee80211_recalc_idle(struct ieee80211_local *local);
+void ieee80211_recalc_idle(struct ieee80211_local *local);
 
 /* tx handling */
 void ieee80211_clear_tx_pending(struct ieee80211_local *local);
diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c
index 256fa19e14ec..8b6daf0219f4 100644
--- a/net/mac80211/iface.c
+++ b/net/mac80211/iface.c
@@ -301,6 +301,8 @@ static int ieee80211_open(struct net_device *dev)
         if (sdata->flags & IEEE80211_SDATA_PROMISC)
                 atomic_inc(&local->iff_promiscs);
 
+        hw_reconf_flags |= __ieee80211_recalc_idle(local);
+
         local->open_count++;
         if (hw_reconf_flags) {
                 ieee80211_hw_config(local, hw_reconf_flags);
@@ -548,6 +550,10 @@ static int ieee80211_stop(struct net_device *dev)
 
         sdata->bss = NULL;
 
+        hw_reconf_flags |= __ieee80211_recalc_idle(local);
+
+        ieee80211_recalc_ps(local, -1);
+
         if (local->open_count == 0) {
                 if (netif_running(local->mdev))
                         dev_close(local->mdev);
@@ -565,8 +571,6 @@ static int ieee80211_stop(struct net_device *dev)
                 hw_reconf_flags = 0;
         }
 
-        ieee80211_recalc_ps(local, -1);
-
         /* do after stop to avoid reconfiguring when we stop anyway */
         if (hw_reconf_flags)
                 ieee80211_hw_config(local, hw_reconf_flags);
@@ -892,3 +896,73 @@ void ieee80211_remove_interfaces(struct ieee80211_local *local)
                 unregister_netdevice(sdata->dev);
         }
 }
+
+static u32 ieee80211_idle_off(struct ieee80211_local *local,
+                              const char *reason)
+{
+        if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
+                return 0;
+
+#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
+        printk(KERN_DEBUG "%s: device no longer idle - %s\n",
+               wiphy_name(local->hw.wiphy), reason);
+#endif
+
+        local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
+        return IEEE80211_CONF_CHANGE_IDLE;
+}
+
+static u32 ieee80211_idle_on(struct ieee80211_local *local)
+{
+        if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
+                return 0;
+
+#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
+        printk(KERN_DEBUG "%s: device now idle\n",
+               wiphy_name(local->hw.wiphy));
+#endif
+
+        local->hw.conf.flags |= IEEE80211_CONF_IDLE;
+        return IEEE80211_CONF_CHANGE_IDLE;
+}
+
+u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
+{
+        struct ieee80211_sub_if_data *sdata;
+        int count = 0;
+
+        if (local->hw_scanning || local->sw_scanning)
+                return ieee80211_idle_off(local, "scanning");
+
+        list_for_each_entry(sdata, &local->interfaces, list) {
+                if (!netif_running(sdata->dev))
+                        continue;
+                /* do not count disabled managed interfaces */
+                if (sdata->vif.type == NL80211_IFTYPE_STATION &&
+                    sdata->u.mgd.state == IEEE80211_STA_MLME_DISABLED)
+                        continue;
+                /* do not count unused IBSS interfaces */
+                if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
+                    !sdata->u.ibss.ssid_len)
+                        continue;
+                /* count everything else */
+                count++;
+        }
+
+        if (!count)
+                return ieee80211_idle_on(local);
+        else
+                return ieee80211_idle_off(local, "in use");
+
+        return 0;
+}
+
+void ieee80211_recalc_idle(struct ieee80211_local *local)
+{
+        u32 chg;
+
+        mutex_lock(&local->iflist_mtx);
+        chg = __ieee80211_recalc_idle(local);
+        mutex_unlock(&local->iflist_mtx);
+        ieee80211_hw_config(local, chg);
+}
diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index 2ded4766d014..5509c5aa6beb 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -890,6 +890,7 @@ static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata)
                 printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
                        sdata->dev->name, ifmgd->bssid);
                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
+                ieee80211_recalc_idle(local);
                 cfg80211_send_auth_timeout(sdata->dev, ifmgd->bssid);
 
                 /*
@@ -938,6 +939,7 @@ static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata)
                        " timed out\n",
                        sdata->dev->name, ifmgd->bssid);
                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
+                ieee80211_recalc_idle(local);
                 cfg80211_send_auth_timeout(sdata->dev, ifmgd->bssid);
                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
                                 sdata->local->hw.conf.channel->center_freq,
@@ -1041,6 +1043,8 @@ static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
 
         rcu_read_unlock();
 
+        ieee80211_recalc_idle(local);
+
         /* channel(_type) changes are handled by ieee80211_hw_config */
         local->oper_channel_type = NL80211_CHAN_NO_HT;
 
@@ -1121,6 +1125,7 @@ static void ieee80211_associate(struct ieee80211_sub_if_data *sdata)
                        " timed out\n",
                        sdata->dev->name, ifmgd->bssid);
                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
+                ieee80211_recalc_idle(local);
                 cfg80211_send_assoc_timeout(sdata->dev, ifmgd->bssid);
                 ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
                                 sdata->local->hw.conf.channel->center_freq,
@@ -1141,6 +1146,7 @@ static void ieee80211_associate(struct ieee80211_sub_if_data *sdata)
                 printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
                        "mixed-cell disabled - abort association\n", sdata->dev->name);
                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
+                ieee80211_recalc_idle(local);
                 return;
         }
 
@@ -1279,6 +1285,7 @@ static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata)
         if (ifmgd->flags & IEEE80211_STA_EXT_SME) {
                 /* Wait for SME to request association */
                 ifmgd->state = IEEE80211_STA_MLME_DISABLED;
+                ieee80211_recalc_idle(sdata->local);
         } else
                 ieee80211_associate(sdata);
 }
@@ -1515,6 +1522,7 @@ static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
                 if (ifmgd->flags & IEEE80211_STA_EXT_SME) {
                         /* Wait for SME to decide what to do next */
                         ifmgd->state = IEEE80211_STA_MLME_DISABLED;
+                        ieee80211_recalc_idle(local);
                 }
                 return;
         }
@@ -2083,6 +2091,7 @@ static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata)
                 } else {
                         ifmgd->assoc_scan_tries = 0;
                         ifmgd->state = IEEE80211_STA_MLME_DISABLED;
+                        ieee80211_recalc_idle(local);
                 }
         }
         return -1;
@@ -2126,6 +2135,8 @@ static void ieee80211_sta_work(struct work_struct *work)
         } else if (!test_and_clear_bit(IEEE80211_STA_REQ_RUN, &ifmgd->request))
                 return;
 
+        ieee80211_recalc_idle(local);
+
         switch (ifmgd->state) {
         case IEEE80211_STA_MLME_DISABLED:
                 break;
diff --git a/net/mac80211/scan.c b/net/mac80211/scan.c
index 127bd54e0e38..c99ef8d04d3d 100644
--- a/net/mac80211/scan.c
+++ b/net/mac80211/scan.c
@@ -302,17 +302,9 @@ void ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted)
         /* we only have to protect scan_req and hw/sw scan */
         mutex_unlock(&local->scan_mtx);
 
-        if (was_hw_scan) {
-                /*
-                 * Somebody might have requested channel change during scan
-                 * that we won't have acted upon, try now. ieee80211_hw_config
-                 * will set the flag based on actual changes.
-                 */
-                ieee80211_hw_config(local, 0);
-                goto done;
-        }
-
         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
+        if (was_hw_scan)
+                goto done;
 
         netif_tx_lock_bh(local->mdev);
         netif_addr_lock(local->mdev);
@@ -351,6 +343,7 @@ void ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted)
         mutex_unlock(&local->iflist_mtx);
 
  done:
+        ieee80211_recalc_idle(local);
         ieee80211_mlme_notify_scan_completed(local);
         ieee80211_ibss_notify_scan_completed(local);
         ieee80211_mesh_notify_scan_completed(local);
@@ -471,6 +464,8 @@ static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata,
          * dependency, so that the scan completed calls
          * have more locking freedom.
          */
+
+        ieee80211_recalc_idle(local);
         mutex_unlock(&local->scan_mtx);
 
         if (local->ops->hw_scan)
@@ -487,6 +482,8 @@ static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata,
                 } else
                         local->sw_scanning = false;
 
+                ieee80211_recalc_idle(local);
+
                 local->scan_req = NULL;
                 local->scan_sdata = NULL;
         }