mac80211: Handle power constraint level advertised in 11d+h beacon

This patch uses power constraint level while determining the maximum
transmit power, there by it makes sure that any power mitigation
requirement for the channel in the current regulatory domain is met.

Signed-off-by: Vasanthakumar Thiagarajan <vasanth@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 8 insertions, 2 deletions

diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index e9f3e85d1a9e..c78304db475e 100644
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -214,10 +214,16 @@ int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
         }
 
-        if (!local->user_power_level)
+        if (local->sw_scanning)
                 power = chan->max_power;
         else
-                power = min(chan->max_power, local->user_power_level);
+                power = local->power_constr_level ?
+                        (chan->max_power - local->power_constr_level) :
+                        chan->max_power;
+
+        if (local->user_power_level)
+                power = min(power, local->user_power_level);
+
         if (local->hw.conf.power_level != power) {
                 changed |= IEEE80211_CONF_CHANGE_POWER;
                 local->hw.conf.power_level = power;