linux-kernel - [PATCH] serial: mvebu: Apply old baudrate to termios

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Date:   Tue, 28 Jun 2022 12:41:55 +0300
From:   Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To:     Pali Rohár <pali@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Allen Yan <yanwei@...vell.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Gregory CLEMENT <gregory.clement@...tlin.com>,
        linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Subject: [PATCH] serial: mvebu: Apply old baudrate to termios

A fallback baud rate was derived from old termios but got never applied
to (new/current) termios. Old termios is dropped once ->set_termios()
call chain completes, only termios persists the values. Encode also the
old baud rate into termios.

Fixes: 68a0db1d7da2 ("serial: mvebu-uart: add function to change baudrate")
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>

---
 drivers/tty/serial/mvebu-uart.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/tty/serial/mvebu-uart.c b/drivers/tty/serial/mvebu-uart.c
index 0429c2a54290..12a79018697f 100644
--- a/drivers/tty/serial/mvebu-uart.c
+++ b/drivers/tty/serial/mvebu-uart.c
@@ -592,10 +592,9 @@ static void mvebu_uart_set_termios(struct uart_port *port,
 		if (old)
 			baud = uart_get_baud_rate(port, old, NULL,
 						  min_baud, max_baud);
-	} else {
-		tty_termios_encode_baud_rate(termios, baud, baud);
-		uart_update_timeout(port, termios->c_cflag, baud);
 	}
+	tty_termios_encode_baud_rate(termios, baud, baud);
+	uart_update_timeout(port, termios->c_cflag, baud);
 
 	/* Only the following flag changes are supported */
 	if (old) {

-- 
tg: (f287f971e256..) fix/mvebu-apply-old-baud (depends on: tty-next)