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hsr: use upper/lower device infrastructure

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netdev_upper_dev_link() is useful to manage lower/upper interfaces.
And this function internally validates looping, maximum depth.
All or most virtual interfaces that could have a real interface
(e.g. macsec, macvlan, ipvlan etc.) use lower/upper infrastructure.

Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Taehee Yoo
2020-02-28 18:02:10 +00:00
committed by David S. Miller
parent 81390d0c4e
commit e0a4b99773
3 changed files with 40 additions and 30 deletions
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3
net/hsr/hsr_main.c
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@ -85,7 +85,8 @@ static int hsr_netdev_notify(struct notifier_block *nb, unsigned long event,
master->dev->mtu = mtu_max;
break;
case NETDEV_UNREGISTER:
hsr_del_port(port);
if (!is_hsr_master(dev))
hsr_del_port(port);
break;
case NETDEV_PRE_TYPE_CHANGE:
/* HSR works only on Ethernet devices. Refuse slave to change