diff --git a/net/phonet/socket.c b/net/phonet/socket.c
index c75aa5c..ada2a35 100644
--- a/net/phonet/socket.c
+++ b/net/phonet/socket.c
@@ -227,7 +227,7 @@
 	if (!mask && sk->sk_state == TCP_CLOSE_WAIT)
 		return POLLHUP;
 
-	if (sk->sk_state == TCP_ESTABLISHED && pn->tx_credits)
+	if (sk->sk_state == TCP_ESTABLISHED && atomic_read(&pn->tx_credits))
 		mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
 
 	return mask;