From a1dc6dc7fc496c04fc5793dd2233965cb928c984 Mon Sep 17 00:00:00 2001
From: yintao <yintao@xiaomi.com>
Date: Wed, 25 Oct 2023 11:22:15 +0800
Subject: [PATCH] driver/uart_rpmsg: clear transmit buffer when remote
 exception occurred

Make uart rpmsg work normally when restart the remote core

Signed-off-by: yintao <yintao@xiaomi.com>
---
 drivers/serial/uart_rpmsg.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/serial/uart_rpmsg.c b/drivers/serial/uart_rpmsg.c
index 30b5d0ec73..a312848475 100644
--- a/drivers/serial/uart_rpmsg.c
+++ b/drivers/serial/uart_rpmsg.c
@@ -344,6 +344,9 @@ static void uart_rpmsg_device_destroy(FAR struct rpmsg_device *rdev,
     {
       rpmsg_destroy_ept(&priv->ept);
     }
+
+  dev->dmatx.nbytes = dev->dmatx.length + dev->dmatx.nlength;
+  uart_xmitchars_done(dev);
 }
 
 static int uart_rpmsg_ept_cb(FAR struct rpmsg_endpoint *ept, FAR void *data,