Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261221AbVEXEEA (ORCPT ); Tue, 24 May 2005 00:04:00 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261204AbVEXEEA (ORCPT ); Tue, 24 May 2005 00:04:00 -0400 Received: from gate.crashing.org ([63.228.1.57]:19150 "EHLO gate.crashing.org") by vger.kernel.org with ESMTP id S261221AbVEXED4 (ORCPT ); Tue, 24 May 2005 00:03:56 -0400 Subject: Re: ide-cd vs. DMA From: Benjamin Herrenschmidt To: karim@opersys.com Cc: Jens Axboe , Linux Kernel list In-Reply-To: <4292A69C.4070605@opersys.com> References: <1116891772.30513.6.camel@gaston> <42929F2F.8000101@opersys.com> <1116905090.4992.7.camel@gaston> <4292A69C.4070605@opersys.com> Content-Type: text/plain Date: Tue, 24 May 2005 14:03:38 +1000 Message-Id: <1116907419.4992.11.camel@gaston> Mime-Version: 1.0 X-Mailer: Evolution 2.2.2 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 949 Lines: 27 On Mon, 2005-05-23 at 23:59 -0400, Karim Yaghmour wrote: > 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. > > Here's a little bit more info: > > Here's from dmesg: > hdc: SAMSUNG SC-140B, ATAPI CD/DVD-ROM drive > hdc: ATAPI 40X CD-ROM drive, 128kB Cache, UDMA(33) .../... That's a lot of problems ... I would blame HW here, either a bad cable, bad master/slave jumpers or a bad drive in the chain... or maybe as you suggested, a problem with the controller. Ben. - 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/