add protection for bridging interface changes

SVN-Revision: 5115

package/base-files/default/sbin/ifup

@@ -10,5 +10,12 @@ case "$iftype" in
 esac
 
 for dev in $ifname; do
+	brctl show | grep "$dev" >/dev/null && {
+		# interface is still part of a bridge, correct that
+
+		for brdev in $(brctl show | awk '$2 ~ /^[0-9].*\./ { print $1 }'); do
+			brctl delif "$brdev" "$dev" 2>/dev/null >/dev/null
+		done
+	}
 	setup_interface "$dev" "$1"
 done