From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S935270AbcJQOuF (ORCPT ); Mon, 17 Oct 2016 10:50:05 -0400 Received: from relay3.sgi.com ([192.48.152.1]:54982 "EHLO relay.sgi.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S932860AbcJQOty (ORCPT ); Mon, 17 Oct 2016 10:49:54 -0400 Date: Mon, 17 Oct 2016 09:49:51 -0500 From: Nathan Zimmer To: linux-kernel@vger.kernel.org, linux-serial@vgr.kernel.org, sean@mess.org, gregkh@linuxfoundation.org, alan@linux.intel.com Subject: console issue since 3.6, console=ttyS1 hangs Message-ID: <20161017144951.GA235535@stormcage.americas.sgi.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org A cluster client recently tried to update from Sles11 to Sles12 and found in some cases the boxes would hang in early boot. It came down to console=ttyS1 on the command line. After a bisection I found it happended in here: commit 835d844d1a28efba81d5aca7385e24c29d3a6db2 Author: Sean Young Date: Fri Sep 7 19:06:23 2012 +0100 8250_pnp: do pnp probe before legacy probe I found I can revert the part of the patch in 8250.c (now 8250_core.c) and the hangs do not happen. Bios of the offending box ( I don't know if there a bios update ) Version 2.15.1234. Copyright (C) 2012 American Megatrends, Inc. BIOS Date: 02/05/2014 13:45:09 Ver: ma2e2054.16I I don't have much more info but will collect anything that is asked. Any help would be appeciated. Nate