Introduce a new function, ifexists and use it to avoid attempting to

touch interfaces that don't actually exist in the stop case.  In the
process move some IPv4 specific code from ifconfig_down to ipv4_down.

This should solve problems with ifconfig: error messages on boot when
interfaces are renamed.

etc/network.subr

@@ -70,35 +70,14 @@ ifconfig_up()
 }
 
 # ifconfig_down if
-#	Remove all inet entries from the $if interface. It returns
-#	0 if inet entries were found and removed. It returns 1 if
-#	no entries were found or they could not be removed.
-#
-#	XXX: should not be only inet
+#	returns 1 if wpa_supplicant or dhclient was stopped or
+#	the interface exists.
 #
 ifconfig_down()
 {
 	[ -z "$1" ] && return 1
-	_ifs="^"
 	_cfg=1
 
-	inetList="`ifconfig $1 | grep 'inet ' | tr "\n" "$_ifs"`"
-
-	oldifs="$IFS"
-	IFS="$_ifs"
-	for _inet in $inetList ; do
-		# get rid of extraneous line
-		[ -z "$_inet" ] && break
-
-		_inet=`expr "$_inet" : '.*\(inet \([0-9]\{1,3\}\.\)\{3\}[0-9]\{1,3\}\).*'`
-
-		IFS="$oldifs"
-		ifconfig $1 ${_inet} delete
-		IFS="$_ifs"
-		_cfg=0
-	done
-	IFS="$oldifs"
-
 	if wpaif $1; then
 		/etc/rc.d/wpa_supplicant stop $1
 		_cfg=0
@@ -109,7 +88,10 @@ ifconfig_down()
 		_cfg=0
 	fi
 
-	ifconfig $1 down
+	if ifexists $1; then
+		ifconfig $1 down
+		_cfg=0
+	fi
 
 	return $_cfg
 }
@@ -255,6 +237,13 @@ wpaif()
 	return 1
 }
 
+# ifexists if
+#	Returns 0 if the interface exists and 1 otherwise.
+ifexists()
+{
+	ifconfig $1 > /dev/null 2>&1
+}
+
 # ipv4_up if
 #  add IPv4 addresses to the interface $if 
 ipv4_up()
@@ -269,8 +258,32 @@ ipv4_up()
 ipv4_down()
 {
 	_if=$1
-	ifalias_down ${_if}
-	ipv4_addrs_common ${_if} -alias
+	_ifs="^"
+	_ret=1
+
+	ifexists ${_if} || return 1
+
+	inetList="`ifconfig ${_if} | grep 'inet ' | tr "\n" "$_ifs"`"
+
+	oldifs="$IFS"
+	IFS="$_ifs"
+	for _inet in $inetList ; do
+		# get rid of extraneous line
+		[ -z "$_inet" ] && break
+
+		_inet=`expr "$_inet" : '.*\(inet \([0-9]\{1,3\}\.\)\{3\}[0-9]\{1,3\}\).*'`
+
+		IFS="$oldifs"
+		ifconfig ${_if} ${_inet} delete
+		IFS="$_ifs"
+		_ret=0
+	done
+	IFS="$oldifs"
+
+	ifalias_down ${_if} && _ret=0
+	ipv4_addrs_common ${_if} -alias && _ret=0
+
+	return $_ret
 }
 
 # ipv4_addrs_common if action
@@ -466,6 +479,8 @@ ipx_down()
 	_ifs="^"
 	_ret=1
 
+	ifexists $1 || return 1
+
 	ipxList="`ifconfig $1 | grep 'ipx ' | tr "\n" "$_ifs"`"
 
 	oldifs="$IFS"

etc/pccard_ether

@@ -101,7 +101,7 @@ pccard_ether_stop()
 	/etc/rc.d/netif stop $ifn
 
 	# clean ARP table
-	arp -d -a
+	ifexists $ifn && arp -d -i $ifn -a
 
 	# Clean the routing table
 	if checkyesno removable_route_flush; then