From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755301Ab2A0OWj (ORCPT ); Fri, 27 Jan 2012 09:22:39 -0500 Received: from mail-ww0-f44.google.com ([74.125.82.44]:40792 "EHLO mail-ww0-f44.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752510Ab2A0OWh (ORCPT ); Fri, 27 Jan 2012 09:22:37 -0500 Message-ID: <4F22B326.4060605@suse.cz> Date: Fri, 27 Jan 2012 15:22:30 +0100 From: Jiri Slaby User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:10.0) Gecko/20120118 Thunderbird/10.0 MIME-Version: 1.0 To: philippe.langlais@stericsson.com, Alan Cox , Greg KH , Linux kernel mailing list , linux-serial@vger.kernel.org Subject: 8250 regression: infinite interrupts X-Enigmail-Version: 1.3.4 Content-Type: text/plain; charset=ISO-8859-2 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, the commit below causes infinite interrupts to be generated on some chips. Namely on IBM x3850 M2. commit 235dae5d094c415fcf0fc79fa637f1901bc8afe2 Author: Philippe Langlais Date: Thu Jul 29 17:13:57 2010 +0200 U6715 16550A serial driver support The culprit is the added size_fifo call proper in autoconfig_16550a. It returns 16, but the chip is confused by what the function does at that point. It is yet to be investigated why. Any ideas at this stage why this could be a problem? thanks, -- js suse labs