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Commit | Line | Data |
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1 | From e991a2bd4fa0b2f475b67dfe8f33e8ecbdcbb40b Mon Sep 17 00:00:00 2001 | |
2 | From: Alan Cox <alan@lxorguk.ukuu.org.uk> | |
3 | Date: Mon, 28 Apr 2008 02:14:06 -0700 | |
4 | Subject: Fix tty speed handling on 8250 | |
5 | ||
6 | From: Alan Cox <alan@lxorguk.ukuu.org.uk> | |
7 | ||
8 | commit e991a2bd4fa0b2f475b67dfe8f33e8ecbdcbb40b upstream. | |
9 | ||
10 | We try and write the correct speed back but the serial midlayer already | |
11 | mangles the speed on us and that means if we request B0 we report back B9600 | |
12 | when we should not. For now we'll hack around this in the drivers and serial | |
13 | code, pending a better long term solution. | |
14 | ||
15 | Signed-off-by: Alan Cox <alan@redhat.com> | |
16 | Signed-off-by: Andrew Morton <akpm@linux-foundation.org> | |
17 | Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> | |
18 | Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> | |
19 | ||
20 | --- | |
21 | drivers/serial/8250.c | 4 +++- | |
22 | 1 file changed, 3 insertions(+), 1 deletion(-) | |
23 | ||
24 | --- a/drivers/serial/8250.c | |
25 | +++ b/drivers/serial/8250.c | |
26 | @@ -2174,7 +2174,9 @@ serial8250_set_termios(struct uart_port | |
27 | } | |
28 | serial8250_set_mctrl(&up->port, up->port.mctrl); | |
29 | spin_unlock_irqrestore(&up->port.lock, flags); | |
30 | - tty_termios_encode_baud_rate(termios, baud, baud); | |
31 | + /* Don't rewrite B0 */ | |
32 | + if (tty_termios_baud_rate(termios)) | |
33 | + tty_termios_encode_baud_rate(termios, baud, baud); | |
34 | } | |
35 | ||
36 | static void |