linux-kernel - Re: Power management for SCSI

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Message-ID: <Pine.LNX.4.44L0.0808131613400.13982-100000@iolanthe.rowland.org>
Date:	Wed, 13 Aug 2008 16:16:05 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
cc:	Oliver Neukum <oneukum@...e.de>,
	Stefan Richter <stefanr@...6.in-berlin.de>,
	Pavel Machek <pavel@...e.cz>,
	kernel list <linux-kernel@...r.kernel.org>,
	Linux-pm mailing list <linux-pm@...ts.osdl.org>,
	<teheo@...ell.com>
Subject: Re: Power management for SCSI

On Wed, 13 Aug 2008, James Bottomley wrote:

> > With the original patch, you can't operate on the link independent from 
> > the devices.  But with the revised patch (whenever I manage to find 
> > time to write it!), you _will_ be able to.
> 
> That sounds great .. if you link it through the transport class, that
> can implement the policy you want (as in power all devices down before
> the link for USB, but just power down the link for SAS/SATA).

Assuming we have a transport class for USB/Firewire!  That's the reason
I proposed adding such a thing.

Alan Stern

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