linux-kernel - [PATCH] serial: 8250_mtk: Fix uart_get_baud

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Message-Id: <20201102120749.374458-1-tientzu@chromium.org>
Date:   Mon,  2 Nov 2020 20:07:49 +0800
From:   Claire Chang <tientzu@...omium.org>
To:     gregkh@...uxfoundation.org, jirislaby@...nel.org,
        andriy.shevchenko@...ux.intel.com
Cc:     eddie.huang@...iatek.com, hsinyi@...omium.org,
        Sergey.Semin@...kalelectronics.ru, changqi.hu@...iatek.com,
        linux-serial@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Claire Chang <tientzu@...omium.org>
Subject: [PATCH] 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@...omium.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);
 
-- 
2.29.1.341.ge80a0c044ae-goog