mm-netlink: only change IFF_UP flag

This fixes the missing NOARP flag on the second and following VLAN
sub-interfaces when multiplexing over the cdc_mbim driver.

ifi_change specifies all the flags we want to change. Any listed
flag which isn't set in ifi_flags will be cleared by the kernel:

        if (ifm->ifi_change)
                flags = (flags & ifm->ifi_change) |
                        (rtnl_dev_get_flags(dev) & ~ifm->ifi_change);

Drivers like cdc_mbim set some netdev flags by default, indicating
supported or unsupported features. The driver emulates an ethernet
netdev but it doesn't implement ARP.  Clearing NOARP on cdc_mbim
netdevs will block IP transmissions, waiting for an ARP reply we
never will receive.

Signed-off-by: Bjørn Mork <bjorn@mork.no>

0 files changed, 0 insertions, 0 deletions