ath9k: initialize tx chainmask before testing channel tx power values

With an uninitialized chainmask, the per-channel power will only contain
the power limits for a single chain instead of the combined tx power.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Cc: stable@kernel.org
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/ath9k/init.c b/drivers/net/wireless/ath/ath9k/init.c
index dceaa4a82811..2e9634641c46 100644
--- a/drivers/net/wireless/ath/ath9k/init.c
+++ b/drivers/net/wireless/ath/ath9k/init.c
@@ -669,8 +669,10 @@ static void ath9k_init_band_txpower(struct ath_softc *sc, int band)
 static void ath9k_init_txpower_limits(struct ath_softc *sc)
 {
         struct ath_hw *ah = sc->sc_ah;
+        struct ath_common *common = ath9k_hw_common(sc->sc_ah);
         struct ath9k_channel *curchan = ah->curchan;
 
+        ah->txchainmask = common->tx_chainmask;
         if (ah->caps.hw_caps & ATH9K_HW_CAP_2GHZ)
                 ath9k_init_band_txpower(sc, IEEE80211_BAND_2GHZ);
         if (ah->caps.hw_caps & ATH9K_HW_CAP_5GHZ)