From: Claire Chang Date: Mon, 2 Nov 2020 12:07:49 +0000 (+0800) Subject: serial: 8250_mtk: Fix uart_get_baud_rate warning X-Git-Tag: v5.15~2456^2~4 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=912ab37c798770f21b182d656937072b58553378;p=platform%2Fkernel%2Flinux-starfive.git 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 Link: https://lore.kernel.org/r/20201102120749.374458-1-tientzu@chromium.org Cc: stable Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/tty/serial/8250/8250_mtk.c b/drivers/tty/serial/8250/8250_mtk.c index 41f4120..fa876e2 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);