netdev - [PATCH net-next] l2tp: don't close sessions in l2tp_tunnel

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Message-ID: <6247d23117b18915f1c7f5325fa8fa77a14dbc19.1510183475.git.g.nault@alphalink.fr>
Date:   Thu, 9 Nov 2017 08:29:52 +0900
From:   Guillaume Nault <g.nault@...halink.fr>
To:     netdev@...r.kernel.org
Cc:     James Chapman <jchapman@...alix.com>
Subject: [PATCH net-next] l2tp: don't close sessions in l2tp_tunnel_destruct()

Sessions are already removed by the proto ->destroy() handlers, and
since commit f3c66d4e144a ("l2tp: prevent creation of sessions on terminated tunnels"),
we're guaranteed that no new session can be created afterwards.

Furthermore, l2tp_tunnel_closeall() can sleep when there are sessions
left to close. So we really shouldn't call it in a ->sk_destruct()
handler, as it can be used from atomic context.

Signed-off-by: Guillaume Nault <g.nault@...halink.fr>
---
 net/l2tp/l2tp_core.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/net/l2tp/l2tp_core.c b/net/l2tp/l2tp_core.c
index 7c8d1eb757a5..350fcd39ebd8 100644
--- a/net/l2tp/l2tp_core.c
+++ b/net/l2tp/l2tp_core.c
@@ -1246,8 +1246,6 @@ static void l2tp_tunnel_destruct(struct sock *sk)
 	list_del_rcu(&tunnel->list);
 	spin_unlock_bh(&pn->l2tp_tunnel_list_lock);

-	l2tp_tunnel_closeall(tunnel);
-
 	tunnel->sock = NULL;
 	l2tp_tunnel_dec_refcount(tunnel);

-- 
2.11.0