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Diffstat (limited to 'net/ipv4/tcp_cong.c')
-rw-r--r--net/ipv4/tcp_cong.c19
1 files changed, 14 insertions, 5 deletions
diff --git a/net/ipv4/tcp_cong.c b/net/ipv4/tcp_cong.c
index c2b174469645..2f26124fd160 100644
--- a/net/ipv4/tcp_cong.c
+++ b/net/ipv4/tcp_cong.c
@@ -189,8 +189,8 @@ void tcp_init_congestion_control(struct sock *sk)
INET_ECN_dontxmit(sk);
}
-void tcp_reinit_congestion_control(struct sock *sk,
- const struct tcp_congestion_ops *ca)
+static void tcp_reinit_congestion_control(struct sock *sk,
+ const struct tcp_congestion_ops *ca)
{
struct inet_connection_sock *icsk = inet_csk(sk);
@@ -338,7 +338,7 @@ out:
* tcp_reinit_congestion_control (if the current congestion control was
* already initialized.
*/
-int tcp_set_congestion_control(struct sock *sk, const char *name, bool load)
+int tcp_set_congestion_control(struct sock *sk, const char *name, bool load, bool reinit)
{
struct inet_connection_sock *icsk = inet_csk(sk);
const struct tcp_congestion_ops *ca;
@@ -360,9 +360,18 @@ int tcp_set_congestion_control(struct sock *sk, const char *name, bool load)
if (!ca) {
err = -ENOENT;
} else if (!load) {
- icsk->icsk_ca_ops = ca;
- if (!try_module_get(ca->owner))
+ const struct tcp_congestion_ops *old_ca = icsk->icsk_ca_ops;
+
+ if (try_module_get(ca->owner)) {
+ if (reinit) {
+ tcp_reinit_congestion_control(sk, ca);
+ } else {
+ icsk->icsk_ca_ops = ca;
+ module_put(old_ca->owner);
+ }
+ } else {
err = -EBUSY;
+ }
} else if (!((ca->flags & TCP_CONG_NON_RESTRICTED) ||
ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))) {
err = -EPERM;