Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net

[linux-2.6-microblaze.git] / net / ipv4 / tcp_metrics.c

diff --git a/net/ipv4/tcp_metrics.c b/net/ipv4/tcp_metrics.c
index 7029b0e..d58e672 100644 (file)
--- a/net/ipv4/tcp_metrics.c
+++ b/net/ipv4/tcp_metrics.c
@@ -329,7 +329,7 @@ void tcp_update_metrics(struct sock *sk)
        int m;
 
        sk_dst_confirm(sk);
-       if (net->ipv4.sysctl_tcp_nometrics_save || !dst)
+       if (READ_ONCE(net->ipv4.sysctl_tcp_nometrics_save) || !dst)
                return;
 
        rcu_read_lock();
@@ -385,7 +385,7 @@ void tcp_update_metrics(struct sock *sk)
 
        if (tcp_in_initial_slowstart(tp)) {
                /* Slow start still did not finish. */
-               if (!net->ipv4.sysctl_tcp_no_ssthresh_metrics_save &&
+               if (!READ_ONCE(net->ipv4.sysctl_tcp_no_ssthresh_metrics_save) &&
                    !tcp_metric_locked(tm, TCP_METRIC_SSTHRESH)) {
                        val = tcp_metric_get(tm, TCP_METRIC_SSTHRESH);
                        if (val && (tcp_snd_cwnd(tp) >> 1) > val)
@@ -401,7 +401,7 @@ void tcp_update_metrics(struct sock *sk)
        } else if (!tcp_in_slow_start(tp) &&
                   icsk->icsk_ca_state == TCP_CA_Open) {
                /* Cong. avoidance phase, cwnd is reliable. */
-               if (!net->ipv4.sysctl_tcp_no_ssthresh_metrics_save &&
+               if (!READ_ONCE(net->ipv4.sysctl_tcp_no_ssthresh_metrics_save) &&
                    !tcp_metric_locked(tm, TCP_METRIC_SSTHRESH))
                        tcp_metric_set(tm, TCP_METRIC_SSTHRESH,
                                       max(tcp_snd_cwnd(tp) >> 1, tp->snd_ssthresh));
@@ -418,7 +418,7 @@ void tcp_update_metrics(struct sock *sk)
                        tcp_metric_set(tm, TCP_METRIC_CWND,
                                       (val + tp->snd_ssthresh) >> 1);
                }
-               if (!net->ipv4.sysctl_tcp_no_ssthresh_metrics_save &&
+               if (!READ_ONCE(net->ipv4.sysctl_tcp_no_ssthresh_metrics_save) &&
                    !tcp_metric_locked(tm, TCP_METRIC_SSTHRESH)) {
                        val = tcp_metric_get(tm, TCP_METRIC_SSTHRESH);
                        if (val && tp->snd_ssthresh > val)
@@ -428,7 +428,8 @@ void tcp_update_metrics(struct sock *sk)
                if (!tcp_metric_locked(tm, TCP_METRIC_REORDERING)) {
                        val = tcp_metric_get(tm, TCP_METRIC_REORDERING);
                        if (val < tp->reordering &&
-                           tp->reordering != net->ipv4.sysctl_tcp_reordering)
+                           tp->reordering !=
+                           READ_ONCE(net->ipv4.sysctl_tcp_reordering))
                                tcp_metric_set(tm, TCP_METRIC_REORDERING,
                                               tp->reordering);
                }
@@ -462,7 +463,7 @@ void tcp_init_metrics(struct sock *sk)
        if (tcp_metric_locked(tm, TCP_METRIC_CWND))
                tp->snd_cwnd_clamp = tcp_metric_get(tm, TCP_METRIC_CWND);
 
-       val = net->ipv4.sysctl_tcp_no_ssthresh_metrics_save ?
+       val = READ_ONCE(net->ipv4.sysctl_tcp_no_ssthresh_metrics_save) ?
              0 : tcp_metric_get(tm, TCP_METRIC_SSTHRESH);
        if (val) {
                tp->snd_ssthresh = val;