ath9k: Reconfigure tx power on regulatory update

Whenever the regulatory got updated by country IE for the world
roaming cards, need to reconfigure the tx power immediately to
increase the power level.

Reviewed-by: Sam Leffler <sleffler@google.com>
Signed-off-by: Rajkumar Manoharan <rmanohar@qca.qualcomm.com>
Acked-by: Luis R. Rodriguez <mcgrof@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/ath9k/init.c

@@ -297,9 +297,22 @@ static int ath9k_reg_notifier(struct wiphy *wiphy,
 {
 	struct ieee80211_hw *hw = wiphy_to_ieee80211_hw(wiphy);
 	struct ath_softc *sc = hw->priv;
-	struct ath_regulatory *reg = ath9k_hw_regulatory(sc->sc_ah);
+	struct ath_hw *ah = sc->sc_ah;
+	struct ath_regulatory *reg = ath9k_hw_regulatory(ah);
+	int ret;
+
+	ret = ath_reg_notifier_apply(wiphy, request, reg);
+
+	/* Set tx power */
+	if (ah->curchan) {
+		sc->config.txpowlimit = 2 * ah->curchan->chan->max_power;
+		ath9k_ps_wakeup(sc);
+		ath9k_hw_set_txpowerlimit(ah, sc->config.txpowlimit, false);
+		sc->curtxpow = ath9k_hw_regulatory(ah)->power_limit;
+		ath9k_ps_restore(sc);
+	}
 
-	return ath_reg_notifier_apply(wiphy, request, reg);
+	return ret;
 }
 
 /*