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.

Fixes: 48a6092fb41f ("serial: stm32-usart: Add STM32 USART Driver")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Erwan Le Ray <erwan.leray@foss.st.com>
Signed-off-by: Valentin Caron <valentin.caron@foss.st.com>
Link: https://lore.kernel.org/r/20220111164441.6178-3-valentin.caron@foss.st.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c
index c1b8828451c8c3b752aa446a307e1d74134d059b..9570002d07e751b27c23911a97b4682e0f47c945 100644 (file)
--- a/drivers/tty/serial/stm32-usart.c
+++ b/drivers/tty/serial/stm32-usart.c
@@ -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) {