linux-kernel - Re: Power management for SCSI

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Message-ID: <Pine.LNX.4.44L0.0808131145160.2151-100000@iolanthe.rowland.org>
Date:	Wed, 13 Aug 2008 11:46:34 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Oliver Neukum <oneukum@...e.de>
cc:	Pavel Machek <pavel@...e.cz>,
	kernel list <linux-kernel@...r.kernel.org>,
	Linux-pm mailing list <linux-pm@...ts.osdl.org>,
	<James.Bottomley@...senpartnership.com>, <teheo@...ell.com>
Subject: Re: Power management for SCSI

On Wed, 13 Aug 2008, Oliver Neukum wrote:

> Am Mittwoch 13 August 2008 16:59:23 schrieb Alan Stern:
> > This is a good question.  Most USB mass-storage devices do not act as a
> > true SCSI bus, but I believe there are a few non-standard ones that do
> > -- the USB device really contains a SCSI host and arbitrary SCSI
> 
> OK, but does it make sense to have SCSI autosuspend? Or should autosuspend
> operate on the bus the _host_ is connected to (usb, pci, ...)?

That's the situation we're in now.  Autosuspend operates on the USB 
bus, but it can't do anything with usb-storage because the child SCSI 
devices don't do a SCSI autosuspend.

Alan Stern

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