If ${netdev} is bonding, brctl addif ${bridge} ${pdev} fails:
can't add ${pdev} to bridge ${bridge}: Invalid argument
Because ${pdev} has no slaves at this point.=20
# Notice that ifdown ${netdev} clears slaves of ${netdev}.
This patch restores slaves before add_to_bridge2 ${bridge} ${pdev}.
Signed-off-by: KUWAMURA Shin'ya <kuwa@jp.fujitsu.com>
Keir Fraser
744ba6479a