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decnet: use correct RCU API to deref sk_dst_cache field

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sock->sk_dst_cache is protected by RCU, therefore we should
use __sk_dst_get() to deref it once we lock the sock.

This fixes several sparse warnings.

Cc: linux-decnet-user@lists.sourceforge.net
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Cong Wang <amwang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Cong Wang
2013-01-22 21:09:50 +00:00
committed by David S. Miller
parent 78fb2de711
commit cec771d646
4 changed files with 7 additions and 5 deletions
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6
net/decnet/af_decnet.c
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@@ -909,6 +909,7 @@ static int __dn_connect(struct sock *sk, struct sockaddr_dn *addr, int addrlen,
struct dn_scp *scp = DN_SK(sk);
int err = -EISCONN;
struct flowidn fld;
struct dst_entry *dst;
if (sock->state == SS_CONNECTED)
goto out;
@@ -955,10 +956,11 @@ static int __dn_connect(struct sock *sk, struct sockaddr_dn *addr, int addrlen,
fld.flowidn_proto = DNPROTO_NSP;
if (dn_route_output_sock(&sk->sk_dst_cache, &fld, sk, flags) < 0)
goto out;
sk->sk_route_caps = sk->sk_dst_cache->dev->features;
dst = __sk_dst_get(sk);
sk->sk_route_caps = dst->dev->features;
sock->state = SS_CONNECTING;
scp->state = DN_CI;
scp->segsize_loc = dst_metric_advmss(sk->sk_dst_cache);
scp->segsize_loc = dst_metric_advmss(dst);
dn_nsp_send_conninit(sk, NSP_CI);
err = -EINPROGRESS;