From e991a2bd4fa0b2f475b67dfe8f33e8ecbdcbb40b Mon Sep 17 00:00:00 2001 From: Alan Cox Date: Mon, 28 Apr 2008 02:14:06 -0700 Subject: [PATCH] Fix tty speed handling on 8250 We try and write the correct speed back but the serial midlayer already mangles the speed on us and that means if we request B0 we report back B9600 when we should not. For now we'll hack around this in the drivers and serial code, pending a better long term solution. Signed-off-by: Alan Cox Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/serial/8250.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c index 96a585e1cee..6d0ce64163e 100644 --- a/drivers/serial/8250.c +++ b/drivers/serial/8250.c @@ -2228,7 +2228,9 @@ serial8250_set_termios(struct uart_port *port, struct ktermios *termios, } serial8250_set_mctrl(&up->port, up->port.mctrl); spin_unlock_irqrestore(&up->port.lock, flags); - tty_termios_encode_baud_rate(termios, baud, baud); + /* Don't rewrite B0 */ + if (tty_termios_baud_rate(termios)) + tty_termios_encode_baud_rate(termios, baud, baud); } static void -- 2.20.1