From b3abc9baf90a88a3da4db783ed8d7961a0b53fdc Mon Sep 17 00:00:00 2001
From: Sebastien Bourdeauducq <sb@m-labs.hk>
Date: Fri, 18 Dec 2015 01:14:57 +0800
Subject: [PATCH] runtime/net_server: fix PCB filter

---
 artiq/runtime/net_server.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/artiq/runtime/net_server.c b/artiq/runtime/net_server.c
index e651b260a..8d9231294 100644
--- a/artiq/runtime/net_server.c
+++ b/artiq/runtime/net_server.c
@@ -220,13 +220,9 @@ void net_server_service(void)
 {
     struct tcp_pcb *pcb;
 
-    /*
-     * Assume all active TCP PCBs with a non-NULL arg are our connections.
-     * lwip defines "active PCB" as being able to send/receive data.
-     */
     pcb = tcp_active_pcbs;
     while(pcb) {
-        if(pcb->callback_arg)
+        if(pcb->recv == net_server_recv) /* filter our connections */
             tcp_pcb_service(pcb->callback_arg, pcb);
         pcb = pcb->next;
     }