patch "serial: stm32: fix software flow control transfer" added to tty-linus

This is a note to let you know that I've just added the patch titled

serial: stm32: fix software flow control transfer

to my tty git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty.git
in the tty-linus branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.

If you have any questions about this process, please let me know.

From 037b91ec7729524107982e36ec4b40f9b174f7a2 Mon Sep 17 00:00:00 2001
From: Valentin Caron <[email protected]>
Date: Tue, 11 Jan 2022 17:44:41 +0100
Subject: serial: stm32: fix software flow control transfer

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.

---
 drivers/tty/serial/stm32-usart.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

index c1b8828451c8..9570002d07e7 100644
@@ -742,7 +742,7 @@ static void stm32_usart_start_tx(struct uart_port *port)
 	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) {

2.35.0