From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tejun Heo Subject: Re: [PATCH 3/5] libata: Implement disk shock protection support Date: Sun, 03 Aug 2008 12:19:56 +0900 Message-ID: <489523DC.2090903@gmail.com> References: <87prp1kvyy.fsf@denkblock.local> <20080726062142.29070.10413.stgit@denkblock.local> <4892B8FE.1070400@gmail.com> <20080801233459.11e9b254@lxorguk.ukuu.org.uk> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: Received: from wa-out-1112.google.com ([209.85.146.179]:19168 "EHLO wa-out-1112.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751043AbYHCDUf (ORCPT ); Sat, 2 Aug 2008 23:20:35 -0400 Received: by wa-out-1112.google.com with SMTP id j37so1083224waf.23 for ; Sat, 02 Aug 2008 20:20:34 -0700 (PDT) In-Reply-To: <20080801233459.11e9b254@lxorguk.ukuu.org.uk> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Alan Cox Cc: Elias Oltmanns , Jeff Garzik , Bartlomiej Zolnierkiewicz , James Bottomley , Pavel Machek , linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org Alan Cox wrote: >> However, SATA or not, there simply isn't a way to abort commands in ATA. >> Issuing random command while other commands are in progress simply is >> state machine violation and there will be many interesting results >> including complete system lockup (ATA controller dying while holding the >> PCI bus). The only reliable way to abort in-flight commands are by >> issuing hardreset. However, ATA reset protocol is not designed for >> quick recovery. The machine is gonna hit the ground hard way before the >> reset protocol is complete. > > Actually you cau can issue idle immediate on older ATA devices. I am not > clear if that was stuck back into the current accelerometer friendly > drives or not. Would need to check with IBLenovo Was that something intentional or was it a happy accident? There can be bus ownership problem on PATA and on SATA this is much more state logic on both sides of the cable and I think things like that would be more difficult to work accidentally. Thanks. -- tejun