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

serial: 8250_mtk: Fix uart_get_baud_rate warning

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 912ab37c798770f21b182d656937072b58553378 Mon Sep 17 00:00:00 2001

From: Claire Chang tientzu@chromium.org Date: Mon, 2 Nov 2020 20:07:49 +0800 Subject: serial: 8250_mtk: Fix uart_get_baud_rate warning

Mediatek 8250 port supports speed higher than uartclk / 16. If the baud rates in both the new and the old termios setting are higher than uartclk / 16, the WARN_ON in uart_get_baud_rate() will be triggered. Passing NULL as the old termios so uart_get_baud_rate() will use uartclk / 16 - 1 as the new baud rate which will be replaced by the original baud rate later by tty_termios_encode_baud_rate() in mtk8250_set_termios().

Fixes: 551e553f0d4a ("serial: 8250_mtk: Fix high-speed baud rates clamping") Signed-off-by: Claire Chang tientzu@chromium.org Link: https://lore.kernel.org/r/20201102120749.374458-1-tientzu@chromium.org Cc: stable stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/tty/serial/8250/8250_mtk.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/tty/serial/8250/8250_mtk.c b/drivers/tty/serial/8250/8250_mtk.c index 41f4120abdf2..fa876e2c13e5 100644 --- a/drivers/tty/serial/8250/8250_mtk.c +++ b/drivers/tty/serial/8250/8250_mtk.c @@ -317,7 +317,7 @@ mtk8250_set_termios(struct uart_port *port, struct ktermios *termios, */ baud = tty_termios_baud_rate(termios);

- serial8250_do_set_termios(port, termios, old); + serial8250_do_set_termios(port, termios, NULL);

tty_termios_encode_baud_rate(termios, baud, baud);