linux-kernel - [PATCH net-next-2.6] net: if6_get

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Message-ID: <1272916007.2407.75.camel@edumazet-laptop>
Date:	Mon, 03 May 2010 21:46:47 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	paulmck@...ux.vnet.ibm.com,
	Stephen Hemminger <shemminger@...tta.com>
Cc:	Valdis.Kletnieks@...edu, Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Patrick McHardy <kaber@...sh.net>,
	"David S. Miller" <davem@...emloft.net>,
	linux-kernel@...r.kernel.org, netfilter-devel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: [PATCH net-next-2.6] net: if6_get_next() fix

Le lundi 03 mai 2010 à 11:16 -0700, Paul E. McKenney a écrit :
> I would be happy to if I could find the commit creating
> hlist_for_each_entry_continue_rcu()...
> 
> I do see a ca. 2008 patch from Stephen Hemminger:
> 
> 	http://www.mail-archive.com/linux-kernel@vger.kernel.org/msg264661.html
> 
> According to http://patchwork.ozlabs.org/patch/47997/, this is
> going up the networking tree as of March 18, 2010.
> 
> So I would be happy to push the patch below, but to do so, I will need
> to adopt the portion of Stephen's patch that created this primitive.
> 

Hmm,  I realize there is a true bug introduced by Stephen patch

Then, net-next-2.6 doesnt yet have your commit Paul to relax
hlist_for_each_entry_rcu(), so its a bit difficult to continue the work.

Thanks

[PATCH net-next-2.6] net: if6_get_next() fix

Must use rcu variant, we are in a rcu_read_lock_bh() section

Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
---
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 34d2d64..16bb85c 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -2979,7 +2979,7 @@ static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
 			return ifa;
 
 	while (++state->bucket < IN6_ADDR_HSIZE) {
-		hlist_for_each_entry(ifa, n,
+		hlist_for_each_entry_rcu(ifa, n,
 				     &inet6_addr_lst[state->bucket], addr_lst) {
 			if (net_eq(dev_net(ifa->idev->dev), net))
 				return ifa;


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