serial: 8250_mtk: Fix uart_get_baud_rate warning

commit 912ab37c798770f21b182d656937072b58553378 upstream.

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>

diff --git a/drivers/tty/serial/8250/8250_mtk.c b/drivers/tty/serial/8250/8250_mtk.c
index b1363114d538c46b2ad4d7cc3852401a158eccc4..496a06d9e8defbfe1135ee07aab7a5a537002af0 100644 (file)
--- a/drivers/tty/serial/8250/8250_mtk.c
+++ b/drivers/tty/serial/8250/8250_mtk.c
@@ -56,7 +56,7 @@ 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);