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[IPV4]: Replace __in_dev_get with __in_dev_get_rcu/rtnl

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The following patch renames __in_dev_get() to __in_dev_get_rtnl() and
introduces __in_dev_get_rcu() to cover the second case.

1) RCU with refcnt should use in_dev_get().
2) RCU without refcnt should use __in_dev_get_rcu().
3) All others must hold RTNL and use __in_dev_get_rtnl().

There is one exception in net/ipv4/route.c which is in fact a pre-existing
race condition.  I've marked it as such so that we remember to fix it.

This patch is based on suggestions and prior work by Suzanne Wood and
Paul McKenney.

Signed-off-by: Herbert Xu <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Herbert Xu 2005-10-03 14:35:55 -07:00 • committed by David S. Miller
commit e5ed639913
24 changed files with 73 additions and 55 deletions
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4
drivers/s390/net/qeth_main.c
View file

@ -5200,7 +5200,7 @@ qeth_free_vlan_addresses4(struct qeth_card *card, unsigned short vid)
if (!card->vlangrp)
return;
rcu_read_lock();
in_dev = __in_dev_get(card->vlangrp->vlan_devices[vid]);
in_dev = __in_dev_get_rcu(card->vlangrp->vlan_devices[vid]);
if (!in_dev)
goto out;
for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
@ -7725,7 +7725,7 @@ qeth_arp_constructor(struct neighbour *neigh)
goto out;
rcu_read_lock();
in_dev = rcu_dereference(__in_dev_get(dev));
in_dev = __in_dev_get_rcu(dev);
if (in_dev == NULL) {
rcu_read_unlock();
return -EINVAL;