From 984f8e7fc9ea41f82959203238593983b6f4f3fc Mon Sep 17 00:00:00 2001
From: oblique <psyberbits@gmail.com>
Date: Sun, 24 Nov 2013 18:37:39 +0200
Subject: [PATCH] If WiFi interface is already set to a channel, don't try to
 change it

---
 create_ap | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/create_ap b/create_ap
index 45ab174..308c261 100755
--- a/create_ap
+++ b/create_ap
@@ -208,6 +208,12 @@ fi
 
 WIFI_IFACE=$1
 VWIFI_IFACE=${WIFI_IFACE}ap
+WIFI_IFACE_CHANNEL=$(iw ${WIFI_IFACE} info | grep channel | awk '{print $2}')
+
+if [[ -n $WIFI_IFACE_CHANNEL && $WIFI_IFACE_CHANNEL -ne $CHANNEL ]]; then
+    echo "hostapd will fail to use channel $CHANNEL because $WIFI_IFACE is already set to channel $WIFI_IFACE_CHANNEL, fallback to channel $WIFI_IFACE_CHANNEL."
+    CHANNEL=$WIFI_IFACE_CHANNEL
+fi
 
 if [[ "$SHARE_METHOD" == "bridge" ]]; then
     BRIDGE_IFACE=$(get_avail_bridge)