From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jeff Garzik Subject: Re: [PATCH 1/2] libata-sff: fix 32-bit PIO ATAPI regression Date: Mon, 16 Feb 2009 18:56:10 -0500 Message-ID: <4999FD1A.3080407@pobox.com> References: <200902152224.25144.sshtylyov@ru.mvista.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from srv5.dvmed.net ([207.36.208.214]:45785 "EHLO mail.dvmed.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751555AbZBPX4R (ORCPT ); Mon, 16 Feb 2009 18:56:17 -0500 In-Reply-To: <200902152224.25144.sshtylyov@ru.mvista.com> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Sergei Shtylyov Cc: linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org, alan@lxorguk.ukuu.org.uk, rjw@sisk.pl, akpm@linux-foundation.org Sergei Shtylyov wrote: > Commit 871af1210f13966ab911ed2166e4ab2ce775b99d (libata: Add 32bit PIO support) > has caused all kinds of errors on the ATAPI devices, so it has been empirically > proven that one shouldn't try to read/write an extra data word when a device is > not expecting it already. "Don't do it then"; however, still use a chance to do > 32-bit read/write one last time when there are exactly 3 trailing bytes. > > Oh, and stop pointlessly swapping the bytes to and fro on big-endian machines > by using io*_rep() accessors which shouldn't byte-swap. > > This patch should fix the kernel.org bug #12609. > > Signed-off-by: Sergei Shtylyov > > --- > Added the comments and signoff. > The patch is against the recent Linus' tree. > It's a hopefully better replacement for Hugh Dickins most recent patch > (http://marc.info/?l=linux-ide&m=123352294619281)... applied, much appreciated!