From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mark Lord Subject: Re: [BUG] libahci returns stale result tf much of the time. Date: Mon, 04 Oct 2010 13:31:24 -0400 Message-ID: <4CAA0F6C.6080609@teksavvy.com> References: <4C9C3878.9010206@teksavvy.com> <4C9C44D0.1030409@teksavvy.com> <4C9CA385.5090709@teksavvy.com> <4C9CA673.4090104@teksavvy.com> <4C9D33C0.8050900@gmail.com> <4CA99BCB.8080904@gmail.com> <4CAA0885.8060906@teksavvy.com> <4CAA0996.5080403@teksavvy.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from ironport2-out.teksavvy.com ([206.248.154.181]:22367 "EHLO ironport2-out.pppoe.ca" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752734Ab0JDRb0 (ORCPT ); Mon, 4 Oct 2010 13:31:26 -0400 In-Reply-To: <4CAA0996.5080403@teksavvy.com> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Tejun Heo Cc: Robert Hancock , Seed , Jeff Garzik , IDE/ATA development list On 10-10-04 01:06 PM, Mark Lord wrote: .. >> That's my theory, too (slow updating of the area). >> I haven't pursued it further yet, but I will. >> >> This is really disruptive for me here, as my primary eSATA >> adaptor in my notebook is JMB360, and it gets used a LOT. > > Okay, I just now ran a quick test on another machine with AHCI: Same bug: > > 00:1f.2 SATA controller: Intel Corporation 82801HR/HO/HH (ICH8R/DO/DH) 6 port SATA AHCI Controller (rev 02) > > So it's probably universal. Try it with this simple test: > > hdparm -I /dev/sdX ## this works > hdparm -Z /dev/sdX ## this will fail --> obsolete vendor-specific command > hdparm -I /dev/sdX ## this fails when following the above > > hdparm -z /dev/sdX ## force some regular I/O, to clear the bad state from the driver > hdparm -I /dev/sdX ## this now works again The issue also seems to be present in 2.6.32.8 on that same Intel AHCI platform, so it probably has nothing to do with the libahci split. Cheers