linux-kernel - [08/68] x25: decrement netdev reference counts on unload

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Message-Id: <20110228162406.465833956@clark.kroah.org>
Date:	Mon, 28 Feb 2011 08:22:29 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Apollon Oikonomopoulos <apollon@....grnet.gr>,
	"David S. Miller" <davem@...emloft.net>
Subject: [08/68] x25: decrement netdev reference counts on unload

2.6.32-longterm review patch.  If anyone has any objections, please let us know.

------------------

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

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: Greg Kroah-Hartman <gregkh@...e.de>

---
 net/x25/x25_link.c |    1 +
 1 file changed, 1 insertion(+)

--- a/net/x25/x25_link.c
+++ b/net/x25/x25_link.c
@@ -393,6 +393,7 @@ 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);
 }

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