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team: block mtu change before it happens via NETDEV_PRECHANGEMTU 

Now it catches the NETDEV_CHANGEMTU notification, which is signaled after
the actual change happened on the device, and returns NOTIFY_BAD, so that
the change on the device is reverted.

This might be quite costly and messy, so use the new NETDEV_PRECHANGEMTU to
catch the MTU change before the actual change happens and signal that it's
forbidden to do it.

CC: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: Veaceslav Falico <vfalico@redhat.com>
Acked-by: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Veaceslav Falico 2014-01-16 00:02:19 +01:00 committed by David S. Miller
parent 1d486bfb66
commit b01f236c66
1 changed files with 1 additions and 1 deletions
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2
drivers/net/team/team.c
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@ -2851,7 +2851,7 @@ static int team_device_event(struct notifier_block *unused,
case NETDEV_FEAT_CHANGE:
team_compute_features(port->team);
break;
case NETDEV_CHANGEMTU:
case NETDEV_PRECHANGEMTU:
/* Forbid to change mtu of underlaying device */
return NOTIFY_BAD;
case NETDEV_PRE_TYPE_CHANGE: