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[patch 02/15] Fix tty speed handling on 8250

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From: Greg KH <gregkh@...>
To: <linux-kernel@...>, <stable@...>
Cc: Justin Forbes <jmforbes@...>, Zwane Mwaikambo <zwane@...>, Theodore Ts'o <tytso@...>, Randy Dunlap <rdunlap@...>, Dave Jones <davej@...>, Chuck Wolber <chuckw@...>, Chris Wedgwood <reviews@...>, Michael Krufky <mkrufky@...>, Chuck Ebbert <cebbert@...>, Domenico Andreoli <cavokz@...>, Willy Tarreau <w@...>, Rodrigo Rubira Branco <rbranco@...>, <torvalds@...>, <akpm@...>, <alan@...>, Alan Cox <alan@...>
Subject: [patch 02/15] Fix tty speed handling on 8250
Date: Thursday, June 19, 2008 - 5:29 pm

2.6.25-stable review patch.  If anyone has any objections, please let us
know.

------------------
From: Alan Cox <alan@lxorguk.ukuu.org.uk>

commit e991a2bd4fa0b2f475b67dfe8f33e8ecbdcbb40b upstream.

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 <alan@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
 drivers/serial/8250.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/serial/8250.c
+++ b/drivers/serial/8250.c
@@ -2174,7 +2174,9 @@ serial8250_set_termios(struct uart_port 
 	}
 	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

-- 
--
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Messages in current thread:
[00/15] 2.6.25-stable review, Greg KH, (Thu Jun 19, 5:26 pm)
[patch 15/15] x86: disable mwait for AMD family 10H/11H CPUs, Greg KH, (Thu Jun 19, 5:30 pm)
[patch 14/15] x86: remove mwait capability C-state check, Greg KH, (Thu Jun 19, 5:30 pm)
[patch 13/15] nf_conntrack_h323: fix memory leak in module i..., Greg KH, (Thu Jun 19, 5:30 pm)
[patch 12/15] nf_conntrack_h323: fix module unload crash, Greg KH, (Thu Jun 19, 5:30 pm)
[patch 11/15] nf_conntrack: fix ctnetlink related crash in n..., Greg KH, (Thu Jun 19, 5:30 pm)
[patch 10/15] SCSI: sr: fix corrupt CD data after media chan..., Greg KH, (Thu Jun 19, 5:30 pm)
[patch 09/15] ACPICA: Ignore ACPI table signature for Load()..., Greg KH, (Thu Jun 19, 5:30 pm)
Re: [patch 09/15] ACPICA: Ignore ACPI table signature for Lo..., , (Fri Jun 27, 6:14 am)
[patch 08/15] scsi_host regression: fix scsi host leak, Greg KH, (Thu Jun 19, 5:29 pm)
[patch 07/15] b43: Fix possible NULL pointer dereference in ..., Greg KH, (Thu Jun 19, 5:29 pm)
[patch 06/15] b43: Fix noise calculation WARN_ON, Greg KH, (Thu Jun 19, 5:29 pm)
[patch 05/15] virtio_net: Fix skb-&gt;csum_start computation, Greg KH, (Thu Jun 19, 5:29 pm)
[patch 04/15] opti621: remove DMA support, Greg KH, (Thu Jun 19, 5:29 pm)
[patch 03/15] opti621: disable read prefetch, Greg KH, (Thu Jun 19, 5:29 pm)
[patch 02/15] Fix tty speed handling on 8250, Greg KH, (Thu Jun 19, 5:29 pm)
[patch 01/15] x86-64: Fix "bytes left to copy" return value ..., Greg KH, (Thu Jun 19, 5:29 pm)