linux-kernel - [34-longterm 151/209] x25: decrement netdev reference counts on unload

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Message-Id: <1302803767-9715-38-git-send-email-paul.gortmaker@windriver.com>
Date:	Thu, 14 Apr 2011 13:55:09 -0400
From:	Paul Gortmaker <paul.gortmaker@...driver.com>
To:	stable@...nel.org, linux-kernel@...r.kernel.org
Cc:	stable-review@...nel.org,
	Apollon Oikonomopoulos <apollon@....grnet.gr>,
	"David S. Miller" <davem@...emloft.net>,
	Paul Gortmaker <paul.gortmaker@...driver.com>
Subject: [34-longterm 151/209] x25: decrement netdev reference counts on unload

From: Apollon Oikonomopoulos <apollon@....grnet.gr>

  =====================================================================
  | This is a commit scheduled for the next v2.6.34 longterm release. |
  | If you see a problem with using this for longterm, please comment.|
  =====================================================================

commit 171995e5d82dcc92bea37a7d2a2ecc21068a0f19 upstream

x25 does not decrement the network device reference counts on module unload.
Thus unregistering any pre-existing interface after unloading the x25 module
hangs and results in

 unregister_netdevice: waiting for tap0 to become free. Usage count = 1

This patch decrements the reference counts of all interfaces in x25_link_free,
the way it is already done in x25_link_device_down for NETDEV_DOWN events.

Signed-off-by: Apollon Oikonomopoulos <apollon@....grnet.gr>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Paul Gortmaker <paul.gortmaker@...driver.com>
---
 net/x25/x25_link.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/net/x25/x25_link.c b/net/x25/x25_link.c
index 73e7b95..b25c646 100644
--- a/net/x25/x25_link.c
+++ b/net/x25/x25_link.c
@@ -394,6 +394,7 @@ void __exit x25_link_free(void)
 	list_for_each_safe(entry, tmp, &x25_neigh_list) {
 		nb = list_entry(entry, struct x25_neigh, node);
 		__x25_remove_neigh(nb);
+		dev_put(nb->dev);
 	}
 	write_unlock_bh(&x25_neigh_list_lock);
 }
-- 
1.7.4.4

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