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    Subject[ 13/54] net: In unregister_netdevice_notifier unregister the netdevices.
    3.0-stable review patch.  If anyone has any objections, please let me know.

    ------------------


    From: "Eric W. Biederman" <ebiederm@xmission.com>

    [ Upstream commit 7d3d43dab4e978d8d9ad1acf8af15c9b1c4b0f0f ]

    We already synthesize events in register_netdevice_notifier and synthesizing
    events in unregister_netdevice_notifier allows to us remove the need for
    special case cleanup code.

    This change should be safe as it adds no new cases for existing callers
    of unregiser_netdevice_notifier to handle.

    Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
    Signed-off-by: David S. Miller <davem@davemloft.net>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    net/core/dev.c | 20 ++++++++++++++++++++
    1 file changed, 20 insertions(+)

    --- a/net/core/dev.c
    +++ b/net/core/dev.c
    @@ -1406,14 +1406,34 @@ EXPORT_SYMBOL(register_netdevice_notifie
    * register_netdevice_notifier(). The notifier is unlinked into the
    * kernel structures and may then be reused. A negative errno code
    * is returned on a failure.
    + *
    + * After unregistering unregister and down device events are synthesized
    + * for all devices on the device list to the removed notifier to remove
    + * the need for special case cleanup code.
    */

    int unregister_netdevice_notifier(struct notifier_block *nb)
    {
    + struct net_device *dev;
    + struct net *net;
    int err;

    rtnl_lock();
    err = raw_notifier_chain_unregister(&netdev_chain, nb);
    + if (err)
    + goto unlock;
    +
    + for_each_net(net) {
    + for_each_netdev(net, dev) {
    + if (dev->flags & IFF_UP) {
    + nb->notifier_call(nb, NETDEV_GOING_DOWN, dev);
    + nb->notifier_call(nb, NETDEV_DOWN, dev);
    + }
    + nb->notifier_call(nb, NETDEV_UNREGISTER, dev);
    + nb->notifier_call(nb, NETDEV_UNREGISTER_BATCH, dev);
    + }
    + }
    +unlock:
    rtnl_unlock();
    return err;
    }



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