This is a note to let you know that I've just added the patch titled
serial: 8250_mid: fix divide error bug if baud rate is 0
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
serial-8250_mid-fix-divide-error-bug-if-baud-rate-is-0.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 47b34d2ef266e2c283b514d65c8963c2ccd42474 Mon Sep 17 00:00:00 2001
From: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Date: Fri, 1 Jul 2016 17:21:49 +0300
Subject: serial: 8250_mid: fix divide error bug if baud rate is 0
From: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
commit 47b34d2ef266e2c283b514d65c8963c2ccd42474 upstream.
Since the commit c1a67b48f6a5 ("serial: 8250_pci: replace switch-case by
formula for Intel MID"), the 8250 driver crashes in the byt_set_termios()
function with a divide error. This is caused by the fact that a baud rate of 0
(B0) is not handled properly. Fix it by falling back to B9600 in this case.
Reported-by: "Mendez Salinas, Fernando" <fernando.mendez.salinas@xxxxxxxxx>
Fixes: c1a67b48f6a5 ("serial: 8250_pci: replace switch-case by formula for Intel MID")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/tty/serial/8250/8250_mid.c | 3 +++
1 file changed, 3 insertions(+)
--- a/drivers/tty/serial/8250/8250_mid.c
+++ b/drivers/tty/serial/8250/8250_mid.c
@@ -149,6 +149,9 @@ static void mid8250_set_termios(struct u
unsigned long w = BIT(24) - 1;
unsigned long mul, div;
+ /* Gracefully handle the B0 case: fall back to B9600 */
+ fuart = fuart ? fuart : 9600 * 16;
+
if (mid->board->freq < fuart) {
/* Find prescaler value that satisfies Fuart < Fref */
if (mid->board->freq > baud)
Patches currently in stable-queue which might be from andriy.shevchenko@xxxxxxxxxxxxxxx are
queue-4.4/serial-8250_mid-fix-divide-error-bug-if-baud-rate-is-0.patch
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