Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262134AbUCJICQ (ORCPT ); Wed, 10 Mar 2004 03:02:16 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262528AbUCJICQ (ORCPT ); Wed, 10 Mar 2004 03:02:16 -0500 Received: from emn-agsl-4744.mxs.adsl.euronet.nl ([212.129.199.68]:44561 "EHLO kapteyn.telox.net") by vger.kernel.org with ESMTP id S262134AbUCJICM (ORCPT ); Wed, 10 Mar 2004 03:02:12 -0500 Date: Wed, 10 Mar 2004 08:52:12 +0100 From: Wouter Lueks To: davidm@hpl.hp.com Cc: linux-kernel@vger.kernel.org Subject: Re: [linux-usb-devel] Re: serious 2.6 bug in USB subsystem? Message-ID: <20040310075211.GA8375@telox.net> References: <16457.26208.980359.82768@napali.hpl.hp.com> <4049FE57.2060809@pacbell.net> <20040308061802.GA25960@cup.hp.com> <16460.49761.482020.911821@napali.hpl.hp.com> <404CEA36.2000903@pacbell.net> <16461.35657.188807.501072@napali.hpl.hp.com> <404E00B5.5060603@pacbell.net> <16462.1463.686711.622754@napali.hpl.hp.com> <404E2B98.6080901@pacbell.net> <16462.48341.393442.583311@napali.hpl.hp.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <16462.48341.393442.583311@napali.hpl.hp.com> X-Operating-System: Linux kapteyn 2.6.3 #1 Sat Mar 6 10:06:04 CET 2004 i686 GNU/Linux User-Agent: Mutt/1.5.5.1+cvs20040105i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1284 Lines: 28 On Tue, Mar 09, 2004 at 10:59:33PM -0800, David Mosberger wrote: > The current OHCI relies on the internals of the dma_pool() > implementation. If the implementation changed to, say, modify the > memory that is free or, heaven forbid, return the memory to the > kernel, you'd get _extremely_ difficult to track down race conditions. > Even so, the code isn't race-free, like I explained yesterday: I'm doing my best to track this thread altough I cannot understand the technical stuff I belive you are havily tracking down a bug in the ohci-hcd, but, according to the problems I expierienced, there is a similar bug in uhci-hcd. 00:1f.2 USB Controller: Intel Corp. 82801BA/BAM USB (Hub #1) (rev 04) (prog-if 00 [UHCI]) Subsystem: NEC Corporation: Unknown device 815e Flags: bus master, medium devsel, latency 0, IRQ 9 I/O ports at 1cc0 [size=32] When there is any further information you need, or any extra testing that needs to be done, please tell me and I'll be happy to help out. Keep up the good work! Wouter Lueks - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/