broadcom-wl: shutdown 'nas' when 'wl' device is disabled

'nas' must be shutdown independently for each 'wl' device to properly
support devices with multiple radios.  Do the shutdown when the device
is disabled instead of when it is brought up.

Signed-off-by: Nathan Hintz <nlhintz@hotmail.com>

SVN-Revision: 38753

package/kernel/broadcom-wl/files/lib/wifi/broadcom.sh

@@ -101,6 +101,9 @@ disable_broadcom() {
 	(
 		include /lib/network
 
+		local pid_file=/var/run/nas.$device.pid
+		[ -e $pid_file ] && start-stop-daemon -K -q -s SIGKILL -p $pid_file && rm $pid_file
+
 		# make sure the interfaces are down and removed from all bridges
 		for dev in $device ${device}-1 ${device}-2 ${device}-3; do
 			ifconfig "$dev" down 2>/dev/null >/dev/null && {
@@ -346,7 +349,6 @@ enable_broadcom() {
 		}
 		_c=$(($_c + 1))
 	done
-	killall -KILL nas >&- 2>&-
 	wlc ifname "$device" stdin <<EOF
 $ifdown