linux-kernel - addrconf: refcnt with IPV6

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Date:	Tue, 23 Nov 2010 15:40:04 +0200
From:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:	"David S. Miller" <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	"Pekka Savola (ipv6)" <pekkas@...core.fi>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>
Subject: addrconf: refcnt with  IPV6_PRIVACY enabled

Hello,

I've sent a patch http://lkml.org/lkml/2010/11/21/124 
"[PATCH] ipv6: fix inet6_dev refcnt with IPV6_PRIVACY enabled" related
to wrong in6_dev refcnt value when IPV6_PRIVACY enabled.

I've took a second look, and question arised - 
Is it actually necessary to in6_dev_hold/in6_dev_put in ipv6_regen_rndid?
In ipv6_regen_rndid we call in6_dev_hold only when mod_timer == 0,
and always in6_dev_put. 


I've removed check for < 0 and goto from __ipv6_regen_rndid call, since it 
always return 0.


Please, kindly review V2.

---

 net/ipv6/addrconf.c |   10 +++-------
 1 files changed, 3 insertions(+), 7 deletions(-)

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 2fc35b3..8187d14 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -425,7 +425,6 @@ static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
 		       dev->name);
 		ndev->cnf.use_tempaddr = -1;
 	} else {
-		in6_dev_hold(ndev);
 		ipv6_regen_rndid((unsigned long) ndev);
 	}
 #endif
@@ -1653,8 +1652,7 @@ static void ipv6_regen_rndid(unsigned long data)
 	if (idev->dead)
 		goto out;
 
-	if (__ipv6_regen_rndid(idev) < 0)
-		goto out;
+	__ipv6_regen_rndid(idev);
 
 	expires = jiffies +
 		idev->cnf.temp_prefered_lft * HZ -
@@ -1667,13 +1665,11 @@ static void ipv6_regen_rndid(unsigned long data)
 		goto out;
 	}
 
-	if (!mod_timer(&idev->regen_timer, expires))
-		in6_dev_hold(idev);
-
+	mod_timer(&idev->regen_timer, expires);
+	
 out:
 	write_unlock_bh(&idev->lock);
 	rcu_read_unlock_bh();
-	in6_dev_put(idev);
 }
 
 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {

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