From 9562d8d1df5df9d71623b4eb8b44824e8c2b918c Mon Sep 17 00:00:00 2001
From: whitequark <whitequark@whitequark.org>
Date: Fri, 23 Sep 2016 08:14:09 +0000
Subject: [PATCH] Rust: liblwip: call tcp_recved where appropriate.

---
 artiq/runtime.rs/liblwip/lib.rs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/artiq/runtime.rs/liblwip/lib.rs b/artiq/runtime.rs/liblwip/lib.rs
index 49af078a0..7c1c32c53 100644
--- a/artiq/runtime.rs/liblwip/lib.rs
+++ b/artiq/runtime.rs/liblwip/lib.rs
@@ -505,7 +505,10 @@ impl TcpStream {
             Some(_) => ()
         }
         match state.recv_buffer.pop_front() {
-            Some(Ok(pbuf)) => return Ok(Some(pbuf)),
+            Some(Ok(pbuf)) => {
+                unsafe { lwip_sys::tcp_recved(self.raw, pbuf.len() as u16) }
+                return Ok(Some(pbuf))
+            },
             _ => unreachable!()
         }
     }