linux-kernel - Re: 24rc8: unregister_netdevice: waiting for ... to become free. Usage count = 1?

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Message-Id: <20080122.224442.142676954.davem@davemloft.net>
Date:	Tue, 22 Jan 2008 22:44:42 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	kernel@....de
Cc:	linux-kernel@...r.kernel.org
Subject: Re: 24rc8: unregister_netdevice: waiting for ... to become free.
 Usage count = 1?

From: Soeren Sonnenburg <kernel@....de>
Date: Wed, 23 Jan 2008 07:42:21 +0100

> Dear all,
> 
> since some 2.6.24rc version I suddenly experience such messages on
> console when trying to shutdown a vpn connection:
> 
> unregister_netdevice: waiting for tun0 to become free. Usage count = 1
> 
> or when removing an usb wlan dongle (although it was ifconfig wlan0
> down'd before)

Current GIT already has a fix for this, attached below:

[NEIGH]: Revert 'Fix race between neigh_parms_release and neightbl_fill_parms'

Commit 9cd40029423701c376391da59d2c6469672b4bed (Fix race between
neigh_parms_release and neightbl_fill_parms) introduced device
reference counting regressions for several people, see:

	http://bugzilla.kernel.org/show_bug.cgi?id=9778

for example.

Signed-off-by: David S. Miller <davem@...emloft.net>

diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index cc8a2f1..29b8ee4 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -1316,6 +1316,8 @@ void neigh_parms_release(struct neigh_table *tbl, struct neigh_parms *parms)
 			*p = parms->next;
 			parms->dead = 1;
 			write_unlock_bh(&tbl->lock);
+			if (parms->dev)
+				dev_put(parms->dev);
 			call_rcu(&parms->rcu_head, neigh_rcu_free_parms);
 			return;
 		}
@@ -1326,8 +1328,6 @@ void neigh_parms_release(struct neigh_table *tbl, struct neigh_parms *parms)
 
 void neigh_parms_destroy(struct neigh_parms *parms)
 {
-	if (parms->dev)
-		dev_put(parms->dev);
 	kfree(parms);
 }
 
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