diff --git a/include/net/tcp.h b/include/net/tcp.h
index 2f456bed33ec3..4e909148fce39 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -1953,7 +1953,11 @@ void __tcp_v4_send_check(struct sk_buff *skb, __be32 saddr, __be32 daddr);
 static inline u32 tcp_notsent_lowat(const struct tcp_sock *tp)
 {
 	struct net *net = sock_net((struct sock *)tp);
-	return tp->notsent_lowat ?: READ_ONCE(net->ipv4.sysctl_tcp_notsent_lowat);
+	u32 val;
+
+	val = READ_ONCE(tp->notsent_lowat);
+
+	return val ?: READ_ONCE(net->ipv4.sysctl_tcp_notsent_lowat);
 }
 
 /* @wake is one when sk_stream_write_space() calls us.
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index eb70c1b866d0f..c980d18d99094 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -3165,7 +3165,7 @@ static int do_tcp_setsockopt(struct sock *sk, int level,
 		err = tcp_repair_set_window(tp, optval, optlen);
 		break;
 	case TCP_NOTSENT_LOWAT:
-		tp->notsent_lowat = val;
+		WRITE_ONCE(tp->notsent_lowat, val);
 		sk->sk_write_space(sk);
 		break;
 	case TCP_INQ:
@@ -3642,7 +3642,7 @@ static int do_tcp_getsockopt(struct sock *sk, int level,
 		val = tcp_time_stamp_raw() + tp->tsoffset;
 		break;
 	case TCP_NOTSENT_LOWAT:
-		val = tp->notsent_lowat;
+		val = READ_ONCE(tp->notsent_lowat);
 		break;
 	case TCP_INQ:
 		val = tp->recvmsg_inq;