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authorFelix Fietkau <nbd@openwrt.org>2011-02-04 12:16:41 +0000
committerFelix Fietkau <nbd@openwrt.org>2011-02-04 12:16:41 +0000
commit2a17a1dd1d074cb7cbdd1ff17339478d69349f08 (patch)
tree8638f6a04fe4cd16b27cd51c8a131067ef301824 /package/mac80211
parent2d5c6da16a1babcc743e1957e285fcd887b2b358 (diff)
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ath9k: reduce false positives in the baseband hang check
SVN-Revision: 25359
Diffstat (limited to 'package/mac80211')
-rw-r--r--package/mac80211/patches/570-ath9k_bb_hang_check_fix.patch109
1 files changed, 109 insertions, 0 deletions
diff --git a/package/mac80211/patches/570-ath9k_bb_hang_check_fix.patch b/package/mac80211/patches/570-ath9k_bb_hang_check_fix.patch
new file mode 100644
index 0000000..5314883
--- /dev/null
+++ b/package/mac80211/patches/570-ath9k_bb_hang_check_fix.patch
@@ -0,0 +1,109 @@
+--- a/drivers/net/wireless/ath/ath9k/main.c
++++ b/drivers/net/wireless/ath/ath9k/main.c
+@@ -177,7 +177,12 @@ static void ath_update_survey_nf(struct
+ }
+ }
+
+-static void ath_update_survey_stats(struct ath_softc *sc)
++/*
++ * Updates the survey statistics and returns the busy time since last
++ * update in %, if the measurement duration was long enough for the
++ * result to be useful, -1 otherwise.
++ */
++static int ath_update_survey_stats(struct ath_softc *sc)
+ {
+ struct ath_hw *ah = sc->sc_ah;
+ struct ath_common *common = ath9k_hw_common(ah);
+@@ -185,9 +190,10 @@ static void ath_update_survey_stats(stru
+ struct survey_info *survey = &sc->survey[pos];
+ struct ath_cycle_counters *cc = &common->cc_survey;
+ unsigned int div = common->clockrate * 1000;
++ int ret = 0;
+
+ if (!ah->curchan)
+- return;
++ return -1;
+
+ if (ah->power_mode == ATH9K_PM_AWAKE)
+ ath_hw_cycle_counters_update(common);
+@@ -202,9 +208,18 @@ static void ath_update_survey_stats(stru
+ survey->channel_time_rx += cc->rx_frame / div;
+ survey->channel_time_tx += cc->tx_frame / div;
+ }
++
++ if (cc->cycles < div)
++ return -1;
++
++ if (cc->cycles > 0)
++ ret = cc->rx_busy * 100 / cc->cycles;
++
+ memset(cc, 0, sizeof(*cc));
+
+ ath_update_survey_nf(sc, pos);
++
++ return ret;
+ }
+
+ /*
+@@ -226,6 +241,8 @@ int ath_set_channel(struct ath_softc *sc
+ if (sc->sc_flags & SC_OP_INVALID)
+ return -EIO;
+
++ sc->hw_busy_count = 0;
++
+ del_timer_sync(&common->ani.timer);
+ cancel_work_sync(&sc->paprd_work);
+ cancel_work_sync(&sc->hw_check_work);
+@@ -584,17 +601,25 @@ static void ath_node_detach(struct ath_s
+ void ath_hw_check(struct work_struct *work)
+ {
+ struct ath_softc *sc = container_of(work, struct ath_softc, hw_check_work);
+- int i;
++ struct ath_common *common = ath9k_hw_common(sc->sc_ah);
++ unsigned long flags;
++ int busy;
+
+ ath9k_ps_wakeup(sc);
++ if (ath9k_hw_check_alive(sc->sc_ah))
++ goto out;
+
+- for (i = 0; i < 3; i++) {
+- if (ath9k_hw_check_alive(sc->sc_ah))
+- goto out;
++ spin_lock_irqsave(&common->cc_lock, flags);
++ busy = ath_update_survey_stats(sc);
++ spin_unlock_irqrestore(&common->cc_lock, flags);
+
+- msleep(1);
+- }
+- ath_reset(sc, true);
++ ath_dbg(common, ATH_DBG_RESET, "Possible baseband hang, "
++ "busy=%d (try %d)\n", busy, sc->hw_busy_count + 1);
++ if (busy >= 99) {
++ if (++sc->hw_busy_count >= 3)
++ ath_reset(sc, true);
++ } else if (busy >= 0)
++ sc->hw_busy_count = 0;
+
+ out:
+ ath9k_ps_restore(sc);
+@@ -988,6 +1013,8 @@ int ath_reset(struct ath_softc *sc, bool
+ struct ieee80211_hw *hw = sc->hw;
+ int r;
+
++ sc->hw_busy_count = 0;
++
+ /* Stop ANI */
+ del_timer_sync(&common->ani.timer);
+
+--- a/drivers/net/wireless/ath/ath9k/ath9k.h
++++ b/drivers/net/wireless/ath/ath9k/ath9k.h
+@@ -598,6 +598,8 @@ struct ath_softc {
+ struct completion paprd_complete;
+ bool paprd_pending;
+
++ unsigned int hw_busy_count;
++
+ u32 intrstatus;
+ u32 sc_flags; /* SC_OP_* */
+ u16 ps_flags; /* PS_* */