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l2tp: free sessions using rcu

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l2tp sessions may be accessed under an rcu read lock. Have them freed
via rcu and remove the now unneeded synchronize_rcu when a session is
removed.

Signed-off-by: James Chapman <jchapman@katalix.com>
Signed-off-by: Tom Parkin <tparkin@katalix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
James Chapman 2024-07-29 16:38:08 +01:00 committed by David S. Miller
parent fc7ec7f554
commit d17e899995
2 changed files with 2 additions and 3 deletions
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4
net/l2tp/l2tp_core.c
View File

@ -166,7 +166,7 @@ static void l2tp_session_free(struct l2tp_session *session)
trace_free_session(session);
if (session->tunnel)
l2tp_tunnel_dec_refcount(session->tunnel);
kfree(session);
kfree_rcu(session, rcu);
}
struct l2tp_tunnel *l2tp_sk_to_tunnel(const struct sock *sk)
@ -1269,8 +1269,6 @@ static void l2tp_session_unhash(struct l2tp_session *session)
spin_unlock_bh(&pn->l2tp_session_idr_lock);
spin_unlock_bh(&tunnel->list_lock);
synchronize_rcu();
}
}

1
net/l2tp/l2tp_core.h
View File

@ -66,6 +66,7 @@ struct l2tp_session_coll_list {
struct l2tp_session {
int magic; /* should be L2TP_SESSION_MAGIC */
long dead;
struct rcu_head rcu;
struct l2tp_tunnel *tunnel; /* back pointer to tunnel context */
u32 session_id;