Phonet: do not set POLLOUT in case of send buffer overflow

Signed-off-by: Rémi Denis-Courmont <remi.denis-courmont@nokia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 1 deletions

diff --git a/net/phonet/socket.c b/net/phonet/socket.c
index 6e9848bf0370..7c91f739f138 100644
--- a/net/phonet/socket.c
+++ b/net/phonet/socket.c
@@ -281,7 +281,9 @@ static unsigned int pn_socket_poll(struct file *file, struct socket *sock,
         if (!mask && sk->sk_state == TCP_CLOSE_WAIT)
                 return POLLHUP;
 
-        if (sk->sk_state == TCP_ESTABLISHED && atomic_read(&pn->tx_credits))
+        if (sk->sk_state == TCP_ESTABLISHED &&
+                atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf &&
+                atomic_read(&pn->tx_credits))
                 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
 
         return mask;