From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sergei Shtylyov Subject: Re: 2.6.15-rc1: IDE: fix potential data corruption with SL82C105 interfaces Date: Mon, 15 May 2006 18:32:16 +0400 Message-ID: <446890F0.3020408@ru.mvista.com> References: <20051112165548.GB28987@flint.arm.linux.org.uk> <1131818615.18258.6.camel@localhost.localdomain> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from rtsoft2.corbina.net ([85.21.88.2]:6342 "HELO mail.dev.rtsoft.ru") by vger.kernel.org with SMTP id S964907AbWEOOdU (ORCPT ); Mon, 15 May 2006 10:33:20 -0400 In-Reply-To: <1131818615.18258.6.camel@localhost.localdomain> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Alan Cox Cc: Russell King , linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org Hello. Alan Cox wrote: > On Sad, 2005-11-12 at 16:55 +0000, Russell King wrote: > >>We must _never_ _ever_ on pain of death enable IDE DMA on SL82C105 >>chipsets where the southbridge revision is <= 5, otherwise data >>corruption will occur. > If you are fixing this driver also set ->serialize = 1; before someone > with dual channel device gets burned. Heh, this driver also tries to cache the single PCI register per-channel like hpt366.c... This buglet concerns using fast PIO timings and is probably harmless though but needs to be fixed -- I'll send a patch soon... I wonder what is otherwise wrong with using 2 channels concurrently? MBR, Sergei