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net: forbid underlaying devices to change its type

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It's not desired for underlaying devices to change type. At the time,
there is for example possible to have bond with changed type from
Ethernet to Infiniband as a port of a bridge. This patch fixes this.

Signed-off-by: Jiri Pirko <[email protected]>
Signed-off-by: Jay Vosburgh <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Jiri Pirko 2010-03-10 10:30:19 +00:00 • committed by David S. Miller
commit 1c01fe14a8
3 changed files with 11 additions and 0 deletions
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4
net/8021q/vlan.c
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@ -530,6 +530,10 @@ static int vlan_device_event(struct notifier_block *unused, unsigned long event,
}
unregister_netdevice_many(&list);
break;
case NETDEV_PRE_TYPE_CHANGE:
/* Forbid underlaying device to change its type. */
return NOTIFY_BAD;
}
out: