1 files changed, 9 insertions, 0 deletions

diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 1eac84b8044e..c6bc0c4d19c6 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -2430,6 +2430,8 @@ static void __net_exit tcp_sk_exit(struct net *net)
 {
         int cpu;
 
+        module_put(net->ipv4.tcp_congestion_control->owner);
+
         for_each_possible_cpu(cpu)
                 inet_ctl_sock_destroy(*per_cpu_ptr(net->ipv4.tcp_sk, cpu));
         free_percpu(net->ipv4.tcp_sk);
@@ -2522,6 +2524,13 @@ static int __net_init tcp_sk_init(struct net *net)
         net->ipv4.sysctl_tcp_fastopen_blackhole_timeout = 60 * 60;
         atomic_set(&net->ipv4.tfo_active_disable_times, 0);
 
+        /* Reno is always built in */
+        if (!net_eq(net, &init_net) &&
+            try_module_get(init_net.ipv4.tcp_congestion_control->owner))
+                net->ipv4.tcp_congestion_control = init_net.ipv4.tcp_congestion_control;
+        else
+                net->ipv4.tcp_congestion_control = &tcp_reno;
+
         return 0;
 fail:
         tcp_sk_exit(net);