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authorDaniel Borkmann <dborkman@redhat.com>2015-01-06 01:57:45 +0300
committerDavid S. Miller <davem@davemloft.net>2015-01-06 06:55:24 +0300
commit29ba4fffd396f4beefe34d24d7bcd86cb5c3e492 (patch)
tree7fade0d785249024d74bba7c36528244591f9581 /net/ipv4/tcp_cong.c
parente715b6d3a5ef55834778d49224e60e8ccb5bf45f (diff)
downloadlinux-29ba4fffd396f4beefe34d24d7bcd86cb5c3e492.tar.xz
net: tcp: refactor reinitialization of congestion control
We can just move this to an extra function and make the code a bit more readable, no functional change. Joint work with Florian Westphal. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Daniel Borkmann <dborkman@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp_cong.c')
-rw-r--r--net/ipv4/tcp_cong.c24
1 files changed, 14 insertions, 10 deletions
diff --git a/net/ipv4/tcp_cong.c b/net/ipv4/tcp_cong.c
index 27ead0dd16bc..38f2f8aa4ceb 100644
--- a/net/ipv4/tcp_cong.c
+++ b/net/ipv4/tcp_cong.c
@@ -107,6 +107,18 @@ void tcp_init_congestion_control(struct sock *sk)
icsk->icsk_ca_ops->init(sk);
}
+static void tcp_reinit_congestion_control(struct sock *sk,
+ const struct tcp_congestion_ops *ca)
+{
+ struct inet_connection_sock *icsk = inet_csk(sk);
+
+ tcp_cleanup_congestion_control(sk);
+ icsk->icsk_ca_ops = ca;
+
+ if (sk->sk_state != TCP_CLOSE && icsk->icsk_ca_ops->init)
+ icsk->icsk_ca_ops->init(sk);
+}
+
/* Manage refcounts on socket close. */
void tcp_cleanup_congestion_control(struct sock *sk)
{
@@ -262,21 +274,13 @@ int tcp_set_congestion_control(struct sock *sk, const char *name)
#endif
if (!ca)
err = -ENOENT;
-
else if (!((ca->flags & TCP_CONG_NON_RESTRICTED) ||
ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)))
err = -EPERM;
-
else if (!try_module_get(ca->owner))
err = -EBUSY;
-
- else {
- tcp_cleanup_congestion_control(sk);
- icsk->icsk_ca_ops = ca;
-
- if (sk->sk_state != TCP_CLOSE && icsk->icsk_ca_ops->init)
- icsk->icsk_ca_ops->init(sk);
- }
+ else
+ tcp_reinit_congestion_control(sk, ca);
out:
rcu_read_unlock();
return err;