This is a note to let you know that I've just added the patch titled
serial: stm32: fix software flow control transfer
to the 5.16-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
serial-stm32-fix-software-flow-control-transfer.patch
and it can be found in the queue-5.16 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 037b91ec7729524107982e36ec4b40f9b174f7a2 Mon Sep 17 00:00:00 2001
From: Valentin Caron <valentin.caron@xxxxxxxxxxx>
Date: Tue, 11 Jan 2022 17:44:41 +0100
Subject: serial: stm32: fix software flow control transfer
From: Valentin Caron <valentin.caron@xxxxxxxxxxx>
commit 037b91ec7729524107982e36ec4b40f9b174f7a2 upstream.
x_char is ignored by stm32_usart_start_tx() when xmit buffer is empty.
Fix start_tx condition to allow x_char to be sent.
Fixes: 48a6092fb41f ("serial: stm32-usart: Add STM32 USART Driver")
Cc: stable <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Erwan Le Ray <erwan.leray@xxxxxxxxxxx>
Signed-off-by: Valentin Caron <valentin.caron@xxxxxxxxxxx>
Link: https://lore.kernel.org/r/20220111164441.6178-3-valentin.caron@xxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/tty/serial/stm32-usart.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/tty/serial/stm32-usart.c
+++ b/drivers/tty/serial/stm32-usart.c
@@ -696,7 +696,7 @@ static void stm32_usart_start_tx(struct
struct serial_rs485 *rs485conf = &port->rs485;
struct circ_buf *xmit = &port->state->xmit;
- if (uart_circ_empty(xmit))
+ if (uart_circ_empty(xmit) && !port->x_char)
return;
if (rs485conf->flags & SER_RS485_ENABLED) {
Patches currently in stable-queue which might be from valentin.caron@xxxxxxxxxxx are
queue-5.16/serial-stm32-fix-software-flow-control-transfer.patch
