From 0354699ae39d545778c5a6f77fade76a1b0264d0 Mon Sep 17 00:00:00 2001
From: pca006132 <john.lck40@gmail.com>
Date: Thu, 6 Aug 2020 13:59:28 +0800
Subject: [PATCH] runtime/kernel/dma: fixed missing end of buffer marker.

The DMA transfer would halt before.
---
 src/runtime/src/kernel/dma.rs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/runtime/src/kernel/dma.rs b/src/runtime/src/kernel/dma.rs
index b5a79bbf..4d1859c6 100644
--- a/src/runtime/src/kernel/dma.rs
+++ b/src/runtime/src/kernel/dma.rs
@@ -151,6 +151,8 @@ pub extern fn dma_retrieve(name: CSlice<u8>) -> DmaTrace {
             for _ in 0..padding {
                 v.push(0);
             }
+            // trailing zero to indicate end of buffer
+            v.push(0);
             v.copy_within(0..original_length, padding);
             let v = Box::new(v);
             let address = Box::into_raw(v) as *mut Vec<u8> as i32;