From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alan Cox Subject: Re: [PATCH 1/1] pata_it821x: fix lost interrupt with atapi devices Date: Tue, 18 Sep 2007 05:14:00 -0400 Message-ID: <20070918091400.GC13425@devserv.devel.redhat.com> References: <200709041607.l84G7KsT032647@norden.math.tntech.edu> <18141.42848.537873.349518@alkaid.it.uu.se> <20070906013929.1621849d@the-village.bc.nu> <46EE09D3.9010201@gmail.com> <46EE5033.7060708@garzik.org> <46EE68F9.9050707@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from mx1.redhat.com ([66.187.233.31]:60534 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753629AbXIRJPy (ORCPT ); Tue, 18 Sep 2007 05:15:54 -0400 Content-Disposition: inline In-Reply-To: <46EE68F9.9050707@gmail.com> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Tejun Heo Cc: Jeff Garzik , Alan Cox , Mikael Pettersson , Jeff Norden , alan@redhat.com, linux-kernel@vger.kernel.org, Albert CC Lee , IDE/ATA development list On Mon, Sep 17, 2007 at 01:46:01PM +0200, Tejun Heo wrote: > failures and would really like to know what's broken. The reason can be > one of the following two. > > 1. libata itself isn't doing anything wrong but using SCSI for mid and > high level drivers are causing problems as more types of commands are used. > > 2. Mode programming for MWDMA is broken. This doesn't seem too likely > as we're seeing MWDMA failures across different low level drivers but is > still a possibility. 3 and 4 3. Libata is wrong (it is in places) 4. Old IDE uses DMA much less for ATAPI especially