1 files changed, 17 insertions, 6 deletions

diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 141acd92e58a..e7b53d2a971f 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -494,21 +494,32 @@ static inline bool tcp_stream_is_readable(const struct tcp_sock *tp,
 }
 
 /*
- * Socket is not locked. We are protected from async events by poll logic and
- * correct handling of state changes made by other threads is impossible in
- * any case.
+ *      Wait for a TCP event.
+ *
+ *      Note that we don't need to lock the socket, as the upper poll layers
+ *      take care of normal races (between the test and the event) and we don't
+ *      go look at any of the socket buffers directly.
  */
-__poll_t tcp_poll_mask(struct socket *sock, __poll_t events)
+__poll_t tcp_poll(struct file *file, struct socket *sock, poll_table *wait)
 {
+        __poll_t mask;
         struct sock *sk = sock->sk;
         const struct tcp_sock *tp = tcp_sk(sk);
-        __poll_t mask = 0;
         int state;
 
+        sock_poll_wait(file, sk_sleep(sk), wait);
+
         state = inet_sk_state_load(sk);
         if (state == TCP_LISTEN)
                 return inet_csk_listen_poll(sk);
 
+        /* Socket is not locked. We are protected from async events
+         * by poll logic and correct handling of state changes
+         * made by other threads is impossible in any case.
+         */
+
+        mask = 0;
+
         /*
          * EPOLLHUP is certainly not done right. But poll() doesn't
          * have a notion of HUP in just one direction, and for a
@@ -589,7 +600,7 @@ __poll_t tcp_poll_mask(struct socket *sock, __poll_t events)
 
         return mask;
 }
-EXPORT_SYMBOL(tcp_poll_mask);
+EXPORT_SYMBOL(tcp_poll);
 
 int tcp_ioctl(struct sock *sk, int cmd, unsigned long arg)
 {