ath9k: fix counter overflow in survey channel time stats for the operating channel

SVN-Revision: 23381

diff --git a/package/mac80211/patches/526-ath9k_survey_channel_stats.patch b/package/mac80211/patches/526-ath9k_survey_channel_stats.patch
index 842dc812a0b5e1e63a63ad765f1730f1b5403230..57ba398b023bfe5dc91aff517322594c3f0b33da 100644 (file)
--- a/package/mac80211/patches/526-ath9k_survey_channel_stats.patch
+++ b/package/mac80211/patches/526-ath9k_survey_channel_stats.patch
@@ -11,7 +11,7 @@
        struct tasklet_struct bcon_tasklet;
 --- a/drivers/net/wireless/ath/ath9k/main.c
 +++ b/drivers/net/wireless/ath/ath9k/main.c
-@@ -176,6 +176,49 @@ static void ath_start_ani(struct ath_com
+@@ -176,6 +176,44 @@ static void ath_start_ani(struct ath_com
                        msecs_to_jiffies((u32)ah->config.ani_poll_interval));
  }
  
@@ -34,11 +34,8 @@
 +      int pos = ah->curchan - &ah->channels[0];
 +      struct survey_info *survey = &sc->survey[pos];
 +      struct ath_cycle_counters *cc = &common->cc_survey;
-+      unsigned long flags;
 +      unsigned int div = common->clockrate * 1000;
 +
-+      spin_lock_irqsave(&common->cc_lock, flags);
-+
 +      ath_hw_cycle_counters_update(common);
 +
 +      if (cc->cycles > 0) {
@@ -54,14 +51,20 @@
 +      memset(cc, 0, sizeof(*cc));
 +
 +      ath_update_survey_nf(sc, pos);
-+
-+      spin_unlock_irqrestore(&common->cc_lock, flags);
 +}
 +
  /*
   * Set/change channels.  If the channel is really being changed, it's done
   * by reseting the chip.  To accomplish this we must first cleanup any pending
-@@ -1533,7 +1576,8 @@ static int ath9k_config(struct ieee80211
+@@ -454,6 +492,7 @@ void ath_ani_calibrate(unsigned long dat
+               if (aniflag) {
+                       spin_lock_irqsave(&common->cc_lock, flags);
+                       ath9k_hw_ani_monitor(ah, ah->curchan);
++                      ath_update_survey_stats(sc);
+                       spin_unlock_irqrestore(&common->cc_lock, flags);
+               }
+ 
+@@ -1533,7 +1572,8 @@ static int ath9k_config(struct ieee80211
  {
        struct ath_wiphy *aphy = hw->priv;
        struct ath_softc *sc = aphy->sc;
@@ -71,23 +74,26 @@
        struct ieee80211_conf *conf = &hw->conf;
        bool disable_radio;
  
-@@ -1599,6 +1643,10 @@ static int ath9k_config(struct ieee80211
+@@ -1599,6 +1639,11 @@ static int ath9k_config(struct ieee80211
        if (changed & IEEE80211_CONF_CHANGE_CHANNEL) {
                struct ieee80211_channel *curchan = hw->conf.channel;
                int pos = curchan->hw_value;
 +              int old_pos = -1;
++              unsigned long flags;
 +
 +              if (ah->curchan)
 +                      old_pos = ah->curchan - &ah->channels[0];
  
                aphy->chan_idx = pos;
                aphy->chan_is_ht = conf_is_ht(conf);
-@@ -1626,12 +1674,43 @@ static int ath9k_config(struct ieee80211
+@@ -1626,12 +1671,45 @@ static int ath9k_config(struct ieee80211
  
                ath_update_chainmask(sc, conf_is_ht(conf));
  
 +              /* update survey stats for the old channel before switching */
++              spin_lock_irqsave(&common->cc_lock, flags);
 +              ath_update_survey_stats(sc);
++              spin_unlock_irqrestore(&common->cc_lock, flags);
 +
 +              /*
 +               * If the operating channel changes, change the survey in-use flags
@@ -126,25 +132,31 @@
        }
  
  skip_chan_change:
-@@ -2001,9 +2080,12 @@ static int ath9k_get_survey(struct ieee8
+@@ -2001,9 +2079,15 @@ static int ath9k_get_survey(struct ieee8
  {
        struct ath_wiphy *aphy = hw->priv;
        struct ath_softc *sc = aphy->sc;
 -      struct ath_hw *ah = sc->sc_ah;
++      struct ath_common *common = ath9k_hw_common(sc->sc_ah);
        struct ieee80211_supported_band *sband;
 -      struct ath9k_channel *chan;
 +      struct ieee80211_channel *chan;
++      unsigned long flags;
 +      int pos;
 +
++      spin_lock_irqsave(&common->cc_lock, flags);
 +      if (idx == 0)
 +              ath_update_survey_stats(sc);
  
        sband = hw->wiphy->bands[IEEE80211_BAND_2GHZ];
        if (sband && idx >= sband->n_channels) {
-@@ -2017,17 +2099,10 @@ static int ath9k_get_survey(struct ieee8
-       if (!sband || idx >= sband->n_channels)
-           return -ENOENT;
+@@ -2014,21 +2098,17 @@ static int ath9k_get_survey(struct ieee8
+       if (!sband)
+               sband = hw->wiphy->bands[IEEE80211_BAND_5GHZ];
  
+-      if (!sband || idx >= sband->n_channels)
+-          return -ENOENT;
+-
 -      survey->channel = &sband->channels[idx];
 -      chan = &ah->channels[survey->channel->hw_value];
 -      survey->filled = 0;
@@ -155,11 +167,17 @@
 -      if (chan->noisefloor) {
 -              survey->filled |= SURVEY_INFO_NOISE_DBM;
 -              survey->noise = chan->noisefloor;
--      }
++      if (!sband || idx >= sband->n_channels) {
++              spin_unlock_irqrestore(&common->cc_lock, flags);
++              return -ENOENT;
+       }
+ 
 +      chan = &sband->channels[idx];
 +      pos = chan->hw_value;
 +      memcpy(survey, &sc->survey[pos], sizeof(*survey));
 +      survey->channel = chan;
- 
++      spin_unlock_irqrestore(&common->cc_lock, flags);
++
        return 0;
  }
+