-if=$(nvram get ${type}_ifname)
-proto=$(nvram get ${type}_proto)
-if_valid $if && $DEBUG ifconfig $if down
-kill $(cat /var/run/${if}.pid 2>&-) 2>&-
-[ "$if" = "ppp0" ] && killall pppd
-killall ifup.$proto >&- 2>&-
+type=$1
+
+eval "if_proto=\"\${${type}_proto}\""
+eval "if=\"\${${type}_ifname}\""
+[ "${if%%[0-9]}" = "ppp" ] && eval "if=\"\${${type}_device}\""
+
+case "$if_proto" in
+ pppoa) hotplug_dev unregister atm0; exit 0 ;;
+ ""|none) exit 0;;
+esac
+
+hotplug_dev unregister "$if"