From: Remi Pommarel repk@triplefau.lt
commit 968ae2caad0782db5dbbabb560d3cdefd2945d38 upstream.
When TPC is disabled IEEE80211_CONF_CHANGE_POWER event can be handled to reconfigure HW's maximum txpower.
This fixes 0dBm txpower setting when user attaches to an interface for the first time with the following scenario:
ieee80211_do_open() ath9k_add_interface() ath9k_set_txpower() /* Set TX power with not yet initialized sc->hw->conf.power_level */
ieee80211_hw_config() /* Iniatilize sc->hw->conf.power_level and raise IEEE80211_CONF_CHANGE_POWER */
ath9k_config() /* IEEE80211_CONF_CHANGE_POWER is ignored */
This issue can be reproduced with the following:
$ modprobe -r ath9k $ modprobe ath9k $ wpa_supplicant -i wlan0 -c /tmp/wpa.conf & $ iw dev /* Here TX power is either 0 or 3 depending on RF chain */ $ killall wpa_supplicant $ iw dev /* TX power goes back to calibrated value and subsequent calls will be fine */
Fixes: 283dd11994cde ("ath9k: add per-vif TX power capability") Cc: stable@vger.kernel.org Signed-off-by: Remi Pommarel repk@triplefau.lt Signed-off-by: Kalle Valo kvalo@codeaurora.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/net/wireless/ath/ath9k/main.c | 3 +++ 1 file changed, 3 insertions(+)
--- a/drivers/net/wireless/ath/ath9k/main.c +++ b/drivers/net/wireless/ath/ath9k/main.c @@ -1456,6 +1456,9 @@ static int ath9k_config(struct ieee80211 ath_chanctx_set_channel(sc, ctx, &hw->conf.chandef); }
+ if (changed & IEEE80211_CONF_CHANGE_POWER) + ath9k_set_txpower(sc, NULL); + mutex_unlock(&sc->mutex); ath9k_ps_restore(sc);