Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wirel...
[kernel.git] / net / mac80211 / scan.c
index d3381ba..66da0ab 100644 (file)
@@ -227,7 +227,8 @@ static bool ieee80211_prep_hw_scan(struct ieee80211_local *local)
 static void ieee80211_scan_ps_enable(struct ieee80211_sub_if_data *sdata)
 {
        struct ieee80211_local *local = sdata->local;
-       bool ps = false;
+
+       local->scan_ps_enabled = false;
 
        /* FIXME: what to do when local->pspolling is true? */
 
@@ -235,12 +236,13 @@ static void ieee80211_scan_ps_enable(struct ieee80211_sub_if_data *sdata)
        cancel_work_sync(&local->dynamic_ps_enable_work);
 
        if (local->hw.conf.flags & IEEE80211_CONF_PS) {
-               ps = true;
+               local->scan_ps_enabled = true;
                local->hw.conf.flags &= ~IEEE80211_CONF_PS;
                ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
        }
 
-       if (!ps || !(local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK))
+       if (!(local->scan_ps_enabled) ||
+           !(local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK))
                /*
                 * If power save was enabled, no need to send a nullfunc
                 * frame because AP knows that we are sleeping. But if the
@@ -261,7 +263,7 @@ static void ieee80211_scan_ps_disable(struct ieee80211_sub_if_data *sdata)
 
        if (!local->ps_sdata)
                ieee80211_send_nullfunc(local, sdata, 0);
-       else {
+       else if (local->scan_ps_enabled) {
                /*
                 * In !IEEE80211_HW_PS_NULLFUNC_STACK case the hardware
                 * will send a nullfunc frame with the powersave bit set
@@ -277,6 +279,16 @@ static void ieee80211_scan_ps_disable(struct ieee80211_sub_if_data *sdata)
                 */
                local->hw.conf.flags |= IEEE80211_CONF_PS;
                ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
+       } else if (local->hw.conf.dynamic_ps_timeout > 0) {
+               /*
+                * If IEEE80211_CONF_PS was not set and the dynamic_ps_timer
+                * had been running before leaving the operating channel,
+                * restart the timer now and send a nullfunc frame to inform
+                * the AP that we are awake.
+                */
+               ieee80211_send_nullfunc(local, sdata, 0);
+               mod_timer(&local->dynamic_ps_timer, jiffies +
+                         msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
        }
 }