linux-kernel - Re: [PATCH 1/4] scsi: Allow hosts to be flagged as hotpluggable

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Message-ID: <20090716145542.GA14691@srcf.ucam.org>
Date:	Thu, 16 Jul 2009 15:55:42 +0100
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
Cc:	Stefan Richter <stefanr@...6.in-berlin.de>,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	linux-ide@...r.kernel.org
Subject: Re: [PATCH 1/4] scsi: Allow hosts to be flagged as hotpluggable

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@...f.ucam.org
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