Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261487AbVEZOb0 (ORCPT ); Thu, 26 May 2005 10:31:26 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261477AbVEZOb0 (ORCPT ); Thu, 26 May 2005 10:31:26 -0400 Received: from [81.2.110.250] ([81.2.110.250]:8113 "EHLO lxorguk.ukuu.org.uk") by vger.kernel.org with ESMTP id S261487AbVEZObU (ORCPT ); Thu, 26 May 2005 10:31:20 -0400 Subject: Re: ide-cd vs. DMA From: Alan Cox To: Benjamin Herrenschmidt Cc: karim@opersys.com, Jens Axboe , Linux Kernel Mailing List In-Reply-To: <1116905090.4992.7.camel@gaston> References: <1116891772.30513.6.camel@gaston> <42929F2F.8000101@opersys.com> <1116905090.4992.7.camel@gaston> Content-Type: text/plain Content-Transfer-Encoding: 7bit Message-Id: <1117117746.5744.152.camel@localhost.localdomain> Mime-Version: 1.0 X-Mailer: Ximian Evolution 1.4.6 (1.4.6-2) Date: Thu, 26 May 2005 15:29:09 +0100 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 964 Lines: 22 On Maw, 2005-05-24 at 04:24, Benjamin Herrenschmidt wrote: > Well, not sure what's wrong here, but ATAPI errors shouldn't normally > result in stopping DMA. We may want to just blacklist your drive rather > than having this stupid fallback. In this case, I suspect it's > CSS/region issue with a DVD. The fallback should only be triggering on a DMA CRC error. Turning DMA off or using ide-scsi works (as generally does using the -ac kernel tree) because that handles partial completions correctly while readahead caused errors break the base ide-cd driver badly. I would suggest avoiding the ide-cd driver in the base kernel for most purposes, at least until that bug and the "rmmod cache flush" bug are fixed. Alan - 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/