From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tejun Heo Subject: Re: [patch 1/1] Delay on vt6420 when starting ATAPI DMA write Date: Tue, 16 Feb 2010 17:34:27 +0900 Message-ID: <4B7A5893.9010809@gmail.com> References: <20100214120449.503204189@gmail.com> <20100214120819.947320201@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: Received: from mail-px0-f191.google.com ([209.85.216.191]:35771 "EHLO mail-px0-f191.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751246Ab0BPI0Q (ORCPT ); Tue, 16 Feb 2010 03:26:16 -0500 In-Reply-To: <20100214120819.947320201@gmail.com> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Bart Hartgers Cc: Jeff Garzik , linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org On 02/14/2010 09:04 PM, Bart Hartgers wrote: > When writing a disc on certain lite-on dvd-writers (also rebadged > as optiarc/LG/...) connected to a vt6420, the ATAPI CDB ends > up in the datastream and on the disc, causing silent corruption. > Delaying between sending the CDB and starting DMA seems to > prevent this. > > I do not know if there are burners that do not suffer from > this, but the patch should be safe for those as well. > > There are many reports of this issue, but AFAICT no solution was > found before. For example: > http://lkml.indiana.edu/hypermail/linux/kernel/0802.3/0561.html > > Signed-off-by: Bart Hartgers Acked-by: Tejun Heo Thanks! -- tejun