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[NET]: Take RTNL when unregistering notifier 

The netdev notifier call chain is currently unregistered without taking
any locks outside the notifier system.  Because the notifier system itself
does not synchronise unregistration with respect to the calling of the
chain, we as its user need to do our own locking.

We are supposed to take the RTNL for all calls to netdev notifiers, so
taking the RTNL should be sufficient to protect it.

The registration path in dev.c already takes the RTNL so it's OK.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu 2006-03-25 01:24:25 -08:00 committed by David S. Miller
parent 868d2c1efe
commit 9f514950bb
1 changed files with 6 additions and 1 deletions
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7
net/core/dev.c
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@ -977,7 +977,12 @@ int register_netdevice_notifier(struct notifier_block *nb)
int unregister_netdevice_notifier(struct notifier_block *nb)
{
return notifier_chain_unregister(&netdev_chain, nb);
int err;
rtnl_lock();
err = notifier_chain_unregister(&netdev_chain, nb);
rtnl_unlock();
return err;
}
/**