From: Felix Fietkau <nbd@openwrt.org>
Date: Wed, 3 Nov 2010 14:56:05 +0000 (+0000)
Subject: ath9k: fix cycle counter tracking
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=f75ac90b695da2226a25c47d30156983df87ec7b;p=openwrt%2Fstaging%2F981213.git

ath9k: fix cycle counter tracking

SVN-Revision: 23824
---

diff --git a/package/mac80211/patches/590-ath9k_fix_cycle_counter_ps.patch b/package/mac80211/patches/590-ath9k_fix_cycle_counter_ps.patch
new file mode 100644
index 0000000000..4ee5f7359e
--- /dev/null
+++ b/package/mac80211/patches/590-ath9k_fix_cycle_counter_ps.patch
@@ -0,0 +1,33 @@
+--- a/drivers/net/wireless/ath/ath9k/main.c
++++ b/drivers/net/wireless/ath/ath9k/main.c
+@@ -94,11 +94,13 @@ void ath9k_ps_wakeup(struct ath_softc *s
+ {
+ 	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
+ 	unsigned long flags;
++	enum ath9k_power_mode power_mode;
+ 
+ 	spin_lock_irqsave(&sc->sc_pm_lock, flags);
+ 	if (++sc->ps_usecount != 1)
+ 		goto unlock;
+ 
++	power_mode = sc->sc_ah->power_mode;
+ 	ath9k_hw_setpower(sc->sc_ah, ATH9K_PM_AWAKE);
+ 
+ 	/*
+@@ -106,10 +108,12 @@ void ath9k_ps_wakeup(struct ath_softc *s
+ 	 * useful data. Better clear them now so that they don't mess up
+ 	 * survey data results.
+ 	 */
+-	spin_lock(&common->cc_lock);
+-	ath_hw_cycle_counters_update(common);
+-	memset(&common->cc_survey, 0, sizeof(common->cc_survey));
+-	spin_unlock(&common->cc_lock);
++	if (power_mode != ATH9K_PM_AWAKE) {
++		spin_lock(&common->cc_lock);
++		ath_hw_cycle_counters_update(common);
++		memset(&common->cc_survey, 0, sizeof(common->cc_survey));
++		spin_unlock(&common->cc_lock);
++	}
+ 
+  unlock:
+ 	spin_unlock_irqrestore(&sc->sc_pm_lock, flags);