openwrt-xburst/package/mac80211/patches/550-ath9k-enable-2GHz-band-only-if-the-device-supports.patch

--- a/drivers/net/wireless/ath/ath9k/hw.c
+++ b/drivers/net/wireless/ath/ath9k/hw.c
@@ -979,7 +979,10 @@ int ath9k_hw_init(struct ath_hw *ah)
 		return r;
 
 	ath9k_hw_init_mode_gain_regs(ah);
-	ath9k_hw_fill_cap_info(ah);
+	r = ath9k_hw_fill_cap_info(ah);
+	if (r)
+		return r;
+
 	ath9k_hw_init_11a_eeprom_fix(ah);
 
 	r = ath9k_hw_init_macaddr(ah);
@@ -3115,7 +3118,7 @@ EXPORT_SYMBOL(ath9k_hw_set_sta_beacon_ti
 /* HW Capabilities */
 /*******************/
 
-void ath9k_hw_fill_cap_info(struct ath_hw *ah)
+int ath9k_hw_fill_cap_info(struct ath_hw *ah)
 {
 	struct ath9k_hw_capabilities *pCap = &ah->caps;
 	struct ath_regulatory *regulatory = ath9k_hw_regulatory(ah);
@@ -3146,6 +3149,12 @@ void ath9k_hw_fill_cap_info(struct ath_h
 	}
 
 	eeval = ah->eep_ops->get_eeprom(ah, EEP_OP_MODE);
+	if ((eeval & (AR5416_OPFLAGS_11G | AR5416_OPFLAGS_11A)) == 0) {
+		ath_print(common, ATH_DBG_FATAL,
+			  "no band has been marked as supported in EEPROM.\n");
+		return -EINVAL;
+	}
+
 	bitmap_zero(pCap->wireless_modes, ATH9K_MODE_MAX);
 
 	if (eeval & AR5416_OPFLAGS_11A) {
@@ -3305,6 +3314,8 @@ void ath9k_hw_fill_cap_info(struct ath_h
 	} else {
 		btcoex_hw->scheme = ATH_BTCOEX_CFG_NONE;
 	}
+
+	return 0;
 }
 
 bool ath9k_hw_getcapability(struct ath_hw *ah, enum ath9k_capability_type type,
--- a/drivers/net/wireless/ath/ath9k/hw.h
+++ b/drivers/net/wireless/ath/ath9k/hw.h
@@ -619,7 +619,7 @@ void ath9k_hw_detach(struct ath_hw *ah);
 int ath9k_hw_init(struct ath_hw *ah);
 int ath9k_hw_reset(struct ath_hw *ah, struct ath9k_channel *chan,
 		   bool bChannelChange);
-void ath9k_hw_fill_cap_info(struct ath_hw *ah);
+int ath9k_hw_fill_cap_info(struct ath_hw *ah);
 bool ath9k_hw_getcapability(struct ath_hw *ah, enum ath9k_capability_type type,
 			    u32 capability, u32 *result);
 bool ath9k_hw_setcapability(struct ath_hw *ah, enum ath9k_capability_type type,
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -1805,13 +1805,15 @@ static int ath_init_softc(u16 devid, str
 
 	/* setup channels and rates */
 
-	sc->sbands[IEEE80211_BAND_2GHZ].channels = ath9k_2ghz_chantable;
-	sc->sbands[IEEE80211_BAND_2GHZ].band = IEEE80211_BAND_2GHZ;
-	sc->sbands[IEEE80211_BAND_2GHZ].n_channels =
-		ARRAY_SIZE(ath9k_2ghz_chantable);
-	sc->sbands[IEEE80211_BAND_2GHZ].bitrates = ath9k_legacy_rates;
-	sc->sbands[IEEE80211_BAND_2GHZ].n_bitrates =
-		ARRAY_SIZE(ath9k_legacy_rates);
+	if (test_bit(ATH9K_MODE_11G, sc->sc_ah->caps.wireless_modes)) {
+		sc->sbands[IEEE80211_BAND_2GHZ].channels = ath9k_2ghz_chantable;
+		sc->sbands[IEEE80211_BAND_2GHZ].band = IEEE80211_BAND_2GHZ;
+		sc->sbands[IEEE80211_BAND_2GHZ].n_channels =
+			ARRAY_SIZE(ath9k_2ghz_chantable);
+		sc->sbands[IEEE80211_BAND_2GHZ].bitrates = ath9k_legacy_rates;
+		sc->sbands[IEEE80211_BAND_2GHZ].n_bitrates =
+			ARRAY_SIZE(ath9k_legacy_rates);
+	}
 
 	if (test_bit(ATH9K_MODE_11A, sc->sc_ah->caps.wireless_modes)) {
 		sc->sbands[IEEE80211_BAND_5GHZ].channels = ath9k_5ghz_chantable;
@@ -1886,8 +1888,9 @@ void ath_set_hw_capab(struct ath_softc *
 
 	hw->rate_control_algorithm = "ath9k_rate_control";
 
-	hw->wiphy->bands[IEEE80211_BAND_2GHZ] =
-		&sc->sbands[IEEE80211_BAND_2GHZ];
+	if (test_bit(ATH9K_MODE_11G, sc->sc_ah->caps.wireless_modes))
+		hw->wiphy->bands[IEEE80211_BAND_2GHZ] =
+			&sc->sbands[IEEE80211_BAND_2GHZ];
 	if (test_bit(ATH9K_MODE_11A, sc->sc_ah->caps.wireless_modes))
 		hw->wiphy->bands[IEEE80211_BAND_5GHZ] =
 			&sc->sbands[IEEE80211_BAND_5GHZ];
@@ -1926,9 +1929,12 @@ int ath_init_device(u16 devid, struct at
 	reg = &common->regulatory;
 
 	if (ah->caps.hw_caps & ATH9K_HW_CAP_HT) {
-		setup_ht_cap(sc, &sc->sbands[IEEE80211_BAND_2GHZ].ht_cap);
+		if (test_bit(ATH9K_MODE_11G, ah->caps.wireless_modes))
+			setup_ht_cap(sc,
+				     &sc->sbands[IEEE80211_BAND_2GHZ].ht_cap);
 		if (test_bit(ATH9K_MODE_11A, ah->caps.wireless_modes))
-			setup_ht_cap(sc, &sc->sbands[IEEE80211_BAND_5GHZ].ht_cap);
+			setup_ht_cap(sc,
+				     &sc->sbands[IEEE80211_BAND_5GHZ].ht_cap);
 	}
 
 	/* initialize tx/rx engine */