From 732d32be09e2a9bbe6e648e31482eedb0c0c10b7 Mon Sep 17 00:00:00 2001
From: Shell <smokewood@qq.com>
Date: Fri, 19 Apr 2024 10:59:21 +0800
Subject: [PATCH] [smart] fixup rt_hw_serial_unregister_tty of serial tty

Mutex lock should be taken before release the TTY device.

Signed-off-by: Shell <smokewood@qq.com>
---
 components/drivers/serial/serial_tty.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/components/drivers/serial/serial_tty.c b/components/drivers/serial/serial_tty.c
index 1443cd1632..a4c3dbbe41 100644
--- a/components/drivers/serial/serial_tty.c
+++ b/components/drivers/serial/serial_tty.c
@@ -358,6 +358,8 @@ rt_err_t rt_hw_serial_unregister_tty(struct rt_serial_device *serial)
     softc = tty_softc(tp);
     serial->rx_notify = softc->backup_notify;
 
+    tty_lock(tp);
+
     tty_rel_gone(tp);
 
     /* device unregister? */