From 2eadb652ff1d8e043736006aa74170dbb6d67f15 Mon Sep 17 00:00:00 2001
From: Harry Ho <hh@m-labs.hk>
Date: Tue, 16 Mar 2021 10:25:23 +0800
Subject: [PATCH] nal: Fix infinite loop when TX buffer is full

* For example, if the PHY linkup is down, instead of looping until resumption of the linkup, a write operation now closes the socket for re-connection in the future
---
 src/nal.rs | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/nal.rs b/src/nal.rs
index 5d23898..5648faf 100644
--- a/src/nal.rs
+++ b/src/nal.rs
@@ -247,6 +247,12 @@ where
             };
             match result {
                 Ok(num_bytes) => {
+                    // If the buffer is completely filled, close the socket and
+                    // return an error
+                    if num_bytes == 0 {
+                        write_error = true;
+                        break;
+                    }
                     // In case the buffer is filled up, push bytes into ethernet driver
                     if num_bytes != non_queued_bytes.len() {
                         self.update()?;