From e549afa190be1815b3de940305b39660315bdfa7 Mon Sep 17 00:00:00 2001
From: Conrad Lara - KG6JEI <KG6JEI@amsat.org>
Date: Sun, 4 May 2014 14:28:03 -0700
Subject: [PATCH] Only subtract poweroffset when the value given by iwinfo has
 an offset applied

---
 files/www/cgi-bin/setup | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/files/www/cgi-bin/setup b/files/www/cgi-bin/setup
index b220c607..6138c3c6 100755
--- a/files/www/cgi-bin/setup
+++ b/files/www/cgi-bin/setup
@@ -95,7 +95,10 @@ $parms{dmz_dhcp_limit} = $dmz_dhcp_limit = $dmz_dhcp_end - $dmz_dhcp_start;
 unless($parms{reload})
 {
     ($wifi_txpower) = `iwinfo wlan0 info 2>/dev/null` =~ /Tx-Power: (\d+)/;
-    $wifi_txpower -= wifi_txpoweroffset();
+    (my $iwoffset) = `iwinfo wlan0 info 2>/dev/null` =~ /TX power offset: (\d+)/;
+    if ( $iwoffset ) {
+        $wifi_txpower -= $iwoffset;
+    }
     if (wifi_useschains()){
         $wifi_txant = `cat /sys/kernel/debug/ieee80211/phy0/ath9k/tx_chainmask`;
         $wifi_rxant = `cat /sys/kernel/debug/ieee80211/phy0/ath9k/rx_chainmask`;