Kernel patch: Ignore 802.11d TX power frames, when setting "fixed TX power"

iface.c.patch

This will force the linux kernel to ignore 802.11d frames sent by acces spoints.
This will only work when TX power is set to fixed. (iwconfig wlan0 txpower fixed)
  
Andreas Nilsen <adde88@gmail.com> / @adde88

--- a/net/mac80211/iface.c
+++ b/net/mac80211/iface.c
@@ -65,7 +65,8 @@ bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
        if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
                power = min(power, sdata->user_power_level);
 
-       if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
+       if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL &&
+               sdata->vif.bss_conf.txpower_type != NL80211_TX_POWER_FIXED)
                power = min(power, sdata->ap_power_level);
 
        if (power != sdata->vif.bss_conf.txpower) {