From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tejun Heo Subject: Re: [PATCH #upstream-fixes] libata: skip 0xff polling for PATA controllers Date: Fri, 09 Nov 2007 09:41:33 +0900 Message-ID: <4733ACBD.4020602@gmail.com> References: <47327262.9020004@gmail.com> <473311A2.9080005@rtr.ca> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: Received: from rv-out-0910.google.com ([209.85.198.185]:40174 "EHLO rv-out-0910.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750738AbXKIBIf (ORCPT ); Thu, 8 Nov 2007 20:08:35 -0500 Received: by rv-out-0910.google.com with SMTP id k20so326768rvb for ; Thu, 08 Nov 2007 17:08:35 -0800 (PST) In-Reply-To: <473311A2.9080005@rtr.ca> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Mark Lord Cc: Jeff Garzik , IDE/ATA development list , Luca Tettamanti Mark Lord wrote: > Tejun Heo wrote: >> In a presentation of true workmanship, pata_ali asserts IRQ >> permanantly if the TF status register is read more than once when >> there's no device attached to the port. > .. > > Is using the altstatus reg (rather than status reg), when possible, > a better idea here? I dunno. It probably differs case-by-case. In general, status reg should be safer as it is supposed to clear IRQ. -- tejun