From 1543e317f1da31b75942316931e8f491a8920811 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Thu, 04 Jan 2024 10:08:02 +0000
Subject: [PATCH] disable FB

---
 kernel/drivers/tty/serial/serial_core.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/kernel/drivers/tty/serial/serial_core.c b/kernel/drivers/tty/serial/serial_core.c
index d674732..76cdf3f 100644
--- a/kernel/drivers/tty/serial/serial_core.c
+++ b/kernel/drivers/tty/serial/serial_core.c
@@ -2244,7 +2244,8 @@
 
 		spin_lock_irq(&uport->lock);
 		ops->stop_tx(uport);
-		ops->set_mctrl(uport, 0);
+		if (!(uport->rs485.flags & SER_RS485_ENABLED))
+			ops->set_mctrl(uport, 0);
 		ops->stop_rx(uport);
 		spin_unlock_irq(&uport->lock);
 

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