From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:46335 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934190AbcIVNoR (ORCPT ); Thu, 22 Sep 2016 09:44:17 -0400 Subject: Patch "serial: 8250_mid: fix divide error bug if baud rate is 0" has been added to the 4.4-stable tree To: andriy.shevchenko@linux.intel.com, fernando.mendez.salinas@intel.com, gregkh@linuxfoundation.org Cc: , From: Date: Thu, 22 Sep 2016 15:42:03 +0200 Message-ID: <14745517232361@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: 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 know about it. >>From 47b34d2ef266e2c283b514d65c8963c2ccd42474 Mon Sep 17 00:00:00 2001 From: Andy Shevchenko 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 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" Fixes: c1a67b48f6a5 ("serial: 8250_pci: replace switch-case by formula for Intel MID") Signed-off-by: Andy Shevchenko Signed-off-by: Greg Kroah-Hartman --- 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@linux.intel.com are queue-4.4/serial-8250_mid-fix-divide-error-bug-if-baud-rate-is-0.patch