From a4f11ca22e6f69d2feab4f239eb84d35f7cbe555 Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@openwrt.org>
Date: Wed, 29 Oct 2008 17:26:49 +0000
Subject: [PATCH] use pidfiles for hostapd/wpa_supplicant instead of killing
 all processes when bringing an interface down - fixes an issue with random
 hostapd death

SVN-Revision: 13078
---
 package/base-files/files/sbin/wifi             |  2 ++
 package/hostapd/files/hostapd.sh               |  2 +-
 package/madwifi/files/lib/wifi/madwifi.sh      | 10 +++-------
 package/wpa_supplicant/files/wpa_supplicant.sh |  2 +-
 4 files changed, 7 insertions(+), 9 deletions(-)

diff --git a/package/base-files/files/sbin/wifi b/package/base-files/files/sbin/wifi
index 63e132d4f1..e9752c6039 100755
--- a/package/base-files/files/sbin/wifi
+++ b/package/base-files/files/sbin/wifi
@@ -84,6 +84,8 @@ set_wifi_down() {
 	local cfg="$1"
 	local vifs vif vifstr
 
+	[ -f "/var/run/wifi-${cfg}.pid" ] &&
+		kill "$(cat "/var/run/wifi-${cfg}.pid")"
 	uci_revert_state wireless "$cfg"
 	config_get vifs "$cfg" vifs
 	for vif in $vifs; do
diff --git a/package/hostapd/files/hostapd.sh b/package/hostapd/files/hostapd.sh
index 1159c3b156..707fd8c4b8 100644
--- a/package/hostapd/files/hostapd.sh
+++ b/package/hostapd/files/hostapd.sh
@@ -96,6 +96,6 @@ wpa=$wpa
 wpa_pairwise=$crypto
 $hostapd_cfg
 EOF
-	hostapd -B /var/run/hostapd-$ifname.conf
+	hostapd -P /var/run/wifi-$ifname.conf -B /var/run/hostapd-$ifname.conf
 }
 
diff --git a/package/madwifi/files/lib/wifi/madwifi.sh b/package/madwifi/files/lib/wifi/madwifi.sh
index 6ee6435658..5ce288f6e6 100755
--- a/package/madwifi/files/lib/wifi/madwifi.sh
+++ b/package/madwifi/files/lib/wifi/madwifi.sh
@@ -50,18 +50,14 @@ disable_atheros() (
 	local device="$1"
 
 	set_wifi_down "$device"
-	# kill all running hostapd and wpa_supplicant processes that
-	# are running on atheros vifs 
-	for pid in `pidof hostapd wpa_supplicant`; do
-		grep ath /proc/$pid/cmdline >/dev/null && \
-			kill $pid
-	done
 	
 	include /lib/network
 	cd /proc/sys/net
 	for dev in *; do
 		grep "$device" "$dev/%parent" >/dev/null 2>/dev/null && {
-			ifconfig "$dev" down 
+			[ -f "/var/run/wifi-${dev}.pid" ] &&
+				kill "$(cat "/var/run/wifi-${dev}.pid")"
+			ifconfig "$dev" down
 			unbridge "$dev"
 			wlanconfig "$dev" destroy
 		}
diff --git a/package/wpa_supplicant/files/wpa_supplicant.sh b/package/wpa_supplicant/files/wpa_supplicant.sh
index 37ebef7a4b..debdf811a5 100644
--- a/package/wpa_supplicant/files/wpa_supplicant.sh
+++ b/package/wpa_supplicant/files/wpa_supplicant.sh
@@ -75,5 +75,5 @@ network={
 	$password
 }
 EOF
-	[ -z "$proto" ] || wpa_supplicant ${bridge:+ -b $bridge} -B -D ${driver:-wext} -i "$ifname" -c /var/run/wpa_supplicant-$ifname.conf
+	[ -z "$proto" ] || wpa_supplicant ${bridge:+ -b $bridge} -B -P "/var/run/wifi-${ifname}.pid" -D ${driver:-wext} -i "$ifname" -c /var/run/wpa_supplicant-$ifname.conf
 }