From mboxrd@z Thu Jan 1 00:00:00 1970 From: Matthew Garrett Subject: Re: [PATCH 1/4] scsi: Allow hosts to be flagged as hotpluggable Date: Thu, 16 Jul 2009 15:55:42 +0100 Message-ID: <20090716145542.GA14691@srcf.ucam.org> References: <1247701438-18266-1-git-send-email-mjg@redhat.com> <4A5F3975.70503@s5r6.in-berlin.de> <20090716143828.GB13924@srcf.ucam.org> <1247755399.6606.4.camel@mulgrave.site> <20090716144536.GB14345@srcf.ucam.org> <1247756009.6606.9.camel@mulgrave.site> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from cavan.codon.org.uk ([93.93.128.6]:47864 "EHLO cavan.codon.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756205AbZGPOzq (ORCPT ); Thu, 16 Jul 2009 10:55:46 -0400 Content-Disposition: inline In-Reply-To: <1247756009.6606.9.camel@mulgrave.site> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: James Bottomley Cc: Stefan Richter , linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org, linux-ide@vger.kernel.org On Thu, Jul 16, 2009 at 02:53:29PM +0000, James Bottomley wrote: > Well, a flag that says 'hotplug' and means both the controller and bus > support hotplugging might be SCSI specific. However, the fact is that > most people make such a determination on the bus type, so it's a bit > redundant (in true SCSI there really is no controller on a hotplug bus > that doesn't support hotplug because they can't scan the bus without > it). If you intend to use it to make link power management decisions, > that's completely different because SAS PM support still isn't > standardised and most of the rest of SCSI doesn't have it either. So it > sounds to me you're looking for a flag that says "might have a problem > with SATA link power management" ... in which case this is currently > libata specific. We might be able to expand it to libsas if (when) we > actually get link power management standardised, but a lot of the other > busses aren't even going to have a concept of link power management. Makes sense. I'll respin it as a libata feature. -- Matthew Garrett | mjg59@srcf.ucam.org