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net: RCU conversion of dev_getbyhwaddr() and arp_ioctl()

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Le dimanche 05 décembre 2010 à 09:19 +0100, Eric Dumazet a écrit :

> Hmm..
>
> If somebody can explain why RTNL is held in arp_ioctl() (and therefore
> in arp_req_delete()), we might first remove RTNL use in arp_ioctl() so
> that your patch can be applied.
>
> Right now it is not good, because RTNL wont be necessarly held when you
> are going to call arp_invalidate() ?

While doing this analysis, I found a refcount bug in llc, I'll send a
patch for net-2.6

Meanwhile, here is the patch for net-next-2.6

Your patch then can be applied after mine.

Thanks

[PATCH] net: RCU conversion of dev_getbyhwaddr() and arp_ioctl()

dev_getbyhwaddr() was called under RTNL.

Rename it to dev_getbyhwaddr_rcu() and change all its caller to now use
RCU locking instead of RTNL.

Change arp_ioctl() to use RCU instead of RTNL locking.

Note: this fix a dev refcount bug in llc

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet
2010-12-05 01:23:53 +00:00
committed by David S. Miller
parent a2d4b65d47
commit 941666c2e3
5 changed files with 27 additions and 27 deletions
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6
net/ieee802154/af_ieee802154.c
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@@ -52,11 +52,11 @@ struct net_device *ieee802154_get_dev(struct net *net,
switch (addr->addr_type) {
case IEEE802154_ADDR_LONG:
rtnl_lock();
dev = dev_getbyhwaddr(net, ARPHRD_IEEE802154, addr->hwaddr);
rcu_read_lock();
dev = dev_getbyhwaddr_rcu(net, ARPHRD_IEEE802154, addr->hwaddr);
if (dev)
dev_hold(dev);
rtnl_unlock();
rcu_read_unlock();
break;
case IEEE802154_ADDR_SHORT:
if (addr->pan_id == 0xffff ||