The below commit adds support for:

ip link set dummy0 down ip link set dummy0 master bond0 up

but breaks the opposite:

ip link set dummy0 up ip link set dummy0 master bond0 down

Let's add a workaround to have both commands working.

Cc: stable@vger.kernel.org Fixes: a4abfa627c38 ("net: rtnetlink: Enslave device before bringing it up") Signed-off-by: Nicolas Dichtel nicolas.dichtel@6wind.com Acked-by: Phil Sutter phil@nwl.cc --- net/core/rtnetlink.c | 8 ++++++++ 1 file changed, 8 insertions(+)

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c index e8431c6c8490..dd79693c2d91 100644 --- a/net/core/rtnetlink.c +++ b/net/core/rtnetlink.c @@ -2905,6 +2905,14 @@ static int do_setlink(const struct sk_buff *skb, call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); }

+ /* Backward compat: enable to set interface down before enslaving it */ + if (!(ifm->ifi_flags & IFF_UP) && ifm->ifi_change & IFF_UP) { + err = dev_change_flags(dev, rtnl_dev_combine_flags(dev, ifm), + extack); + if (err < 0) + goto errout; + } + if (tb[IFLA_MASTER]) { err = do_set_master(dev, nla_get_u32(tb[IFLA_MASTER]), extack); if (err)