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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 <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Xin Long 2016-02-15 14:28:03 +08:00 committed by David S. Miller
parent bd4508e850
commit f46c7011b0
1 changed files with 2 additions and 2 deletions
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4
net/sctp/input.c
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@ -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;
}