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| author | Jiri Pirko <jiri@mellanox.com> | 2015-10-16 14:01:22 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-10-16 07:15:05 -0700 |
| commit | 573c7ba006edbecff0714db651dd3602b9d0a6a0 (patch) | |
| tree | 95f4e65ae8d2940047c1211fca064bccd41b25eb /net/core/dev.c | |
| parent | 125ecf4b5994f17cb581af399933d0bd0b153080 (diff) | |
| download | linux-stable-573c7ba006edbecff0714db651dd3602b9d0a6a0.tar.gz linux-stable-573c7ba006edbecff0714db651dd3602b9d0a6a0.tar.bz2 linux-stable-573c7ba006edbecff0714db651dd3602b9d0a6a0.zip | |
net: introduce pre-change upper device notifier
This newly introduced netdevice notifier is called before actual change
upper happens. That provides a possibility for notifier handlers to
know upper change will happen and react to it, including possibility to
forbid the change. That is valuable for drivers which can check if the
upper device linkage is supported and forbid that in case it is not.
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/dev.c')
| -rw-r--r-- | net/core/dev.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/net/core/dev.c b/net/core/dev.c index a229bf0d649d..1225b4be8ed6 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -5346,6 +5346,12 @@ static int __netdev_upper_dev_link(struct net_device *dev, changeupper_info.master = master; changeupper_info.linking = true; + ret = call_netdevice_notifiers_info(NETDEV_PRECHANGEUPPER, dev, + &changeupper_info.info); + ret = notifier_to_errno(ret); + if (ret) + return ret; + ret = __netdev_adjacent_dev_link_neighbour(dev, upper_dev, private, master); if (ret) @@ -5488,6 +5494,9 @@ void netdev_upper_dev_unlink(struct net_device *dev, changeupper_info.master = netdev_master_upper_dev_get(dev) == upper_dev; changeupper_info.linking = false; + call_netdevice_notifiers_info(NETDEV_PRECHANGEUPPER, dev, + &changeupper_info.info); + __netdev_adjacent_dev_unlink_neighbour(dev, upper_dev); /* Here is the tricky part. We must remove all dev's lower |