From f46c7011b062726b798fa3326b5b0c2711ead2a0 Mon Sep 17 00:00:00 2001 From: Xin Long Date: Mon, 15 Feb 2016 14:28:03 +0800 Subject: [PATCH] sctp: move rcu_read_lock from __sctp_lookup_association to sctp_lookup_association __sctp_lookup_association() is only invoked by sctp_v4_err() and sctp_rcv(), both which run on the rx BH, and it has been protected by rcu_read_lock [see ip_local_deliver_finish() / ipv6_rcv()]. So we can move it to sctp_lookup_association, only let sctp_lookup_association use rcu_read_lock. Signed-off-by: Xin Long Signed-off-by: David S. Miller --- net/sctp/input.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/net/sctp/input.c b/net/sctp/input.c index 49d2cc751386..21a2d6b7abaf 100644 --- a/net/sctp/input.c +++ b/net/sctp/input.c @@ -937,7 +937,6 @@ static struct sctp_association *__sctp_lookup_association( struct sctp_transport *t; struct sctp_association *asoc = NULL; - rcu_read_lock(); t = sctp_addrs_lookup_transport(net, local, peer); if (!t || !sctp_transport_hold(t)) goto out; @@ -949,7 +948,6 @@ static struct sctp_association *__sctp_lookup_association( sctp_transport_put(t); out: - rcu_read_unlock(); return asoc; } @@ -962,7 +960,9 @@ struct sctp_association *sctp_lookup_association(struct net *net, { struct sctp_association *asoc; + rcu_read_lock(); asoc = __sctp_lookup_association(net, laddr, paddr, transportp); + rcu_read_unlock(); return asoc; } -- 2.20.1