commit ec998e5991781ecdaad0911dc64f1c8d3749c308
Author: Felix Fietkau <nbd@openwrt.org>
Date:   Tue Apr 8 23:42:17 2014 +0200

    ath9k: fix a scheduling while atomic bug in CSA handling
    
    Commit "ath9k: prepare for multi-interface CSA support" added a call to
    ieee80211_iterate_active_interfaces in atomic context (beacon tasklet),
    which is crashing.
    Use ieee80211_iterate_active_interfaces_atomic instead.
    
    Signed-off-by: Felix Fietkau <nbd@openwrt.org>

commit 93f310a38a1d81a4bc8fcd9bf29628bd721cf2ef
Author: Felix Fietkau <nbd@openwrt.org>
Date:   Sun Apr 6 23:35:28 2014 +0200

    ath9k_hw: reduce ANI firstep range for older chips
    
    Use 0-8 instead of 0-16, which is closer to the old implementation.
    Also drop the overwrite of the firstep_low parameter to improve
    stability.
    
    Signed-off-by: Felix Fietkau <nbd@openwrt.org>


--- a/drivers/net/wireless/ath/ath9k/ar5008_phy.c
+++ b/drivers/net/wireless/ath/ath9k/ar5008_phy.c
@@ -1004,11 +1004,9 @@ static bool ar5008_hw_ani_control_new(st
 	case ATH9K_ANI_FIRSTEP_LEVEL:{
 		u32 level = param;
 
-		value = level * 2;
+		value = level;
 		REG_RMW_FIELD(ah, AR_PHY_FIND_SIG,
 			      AR_PHY_FIND_SIG_FIRSTEP, value);
-		REG_RMW_FIELD(ah, AR_PHY_FIND_SIG_LOW,
-			      AR_PHY_FIND_SIG_FIRSTEP_LOW, value);
 
 		if (level != aniState->firstepLevel) {
 			ath_dbg(common, ANI,
--- a/drivers/net/wireless/ath/ath9k/beacon.c
+++ b/drivers/net/wireless/ath/ath9k/beacon.c
@@ -312,10 +312,9 @@ static void ath9k_csa_update_vif(void *d
 
 void ath9k_csa_update(struct ath_softc *sc)
 {
-	ieee80211_iterate_active_interfaces(sc->hw,
-					    IEEE80211_IFACE_ITER_NORMAL,
-					    ath9k_csa_update_vif,
-					    sc);
+	ieee80211_iterate_active_interfaces_atomic(sc->hw,
+						   IEEE80211_IFACE_ITER_NORMAL,
+						   ath9k_csa_update_vif, sc);
 }
 
 void ath9k_beacon_tasklet(unsigned long data)