From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934882AbXKPVfU (ORCPT ); Fri, 16 Nov 2007 16:35:20 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1759416AbXKPVfB (ORCPT ); Fri, 16 Nov 2007 16:35:01 -0500 Received: from smtp-out001.kontent.com ([81.88.40.215]:55251 "EHLO smtp-out001.kontent.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756962AbXKPVfA (ORCPT ); Fri, 16 Nov 2007 16:35:00 -0500 From: Oliver Neukum To: "Maciej W. Rozycki" Subject: Re: question on odd APIC behavior Date: Fri, 16 Nov 2007 22:34:53 +0100 User-Agent: KMail/1.9.6 (enterprise 20070904.708012) Cc: linux-kernel@vger.kernel.org References: <200711150054.34312.oliver@neukum.org> <200711161203.29142.oliver@neukum.org> In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200711162234.54268.oliver@neukum.org> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Am Freitag 16 November 2007 schrieb Maciej W. Rozycki: > On Fri, 16 Nov 2007, Oliver Neukum wrote: > > > > > On irq 20, there's an UHCI, on irq 19 is an EHCI. For every interrupt on 20 > > > > there's a spurious interrupt on 19. USB devices on bus of the controller on 20 > > > > work. So I know all interrupts are seen. ERR does not increase. Interrupts > > > > for devices on the bus of the controller on 19 arrive at 19 only. > > > > > > I suggest you try to sort it out with the maintainers of the UHCI and > > > EHCI drivers then. > > > > They are innocent. This laptop really delivers an interrupt twice. > > Perhaps, but these drivers are involved and the device-specific knowledge > will help tracking down the cause. I have general experience on how > interrupts work, including on APIC-based systems, but I have no idea how > UHCI and EHCI devices work in this area and, in particular, how you know > an interrupt coming from the line #19 is related to one on the line #20 > and then a spurious one if not recorded as ERR or otherwise unclaimed > (which would be reported as "irq 19: nobody cared"). I am getting irq 19:nobody cared. Interrupts on 19 and 20 increase with same rate, disconnecting the device on the bus stops the increase, reconnecting it makes them increase again. Regards Oliver