linux-kernel - Re: [RFD] Automatic suspend

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Date:	Wed, 18 Feb 2009 11:39:21 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Oliver Neukum <oliver@...kum.org>
cc:	Arjan van de Ven <arjan@...radead.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Arve Hjønnevåg <arve@...roid.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Pavel Machek <pavel@....cz>,
	Nigel Cunningham <nigel@...el.suspend2.net>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	mark gross <mgross@...ux.intel.com>,
	"Woodruff, Richard" <r-woodruff2@...com>,
	Uli Luckas <u.luckas@...d.de>,
	Igor Stoppa <igor.stoppa@...ia.com>,
	Brian Swetland <swetland@...gle.com>,
	Len Brown <lenb@...nel.org>
Subject: Re: [RFD] Automatic suspend

On Wed, 18 Feb 2009, Oliver Neukum wrote:

> Am Wednesday 18 February 2009 16:10:48 schrieb Alan Stern:
> > On Wed, 18 Feb 2009, Oliver Neukum wrote:
> > 
> > > But the transport and the driver may be in different subsystems, e.g.
> > > usb storage.
> > 
> > We would have to add a part of usb-storage into the SCSI subsystem, by 
> > creating a USB transport class.  Perhaps this class could be shared 
> > with Firewire/IEEE1394.
> 
> That would be a specific solution. But the problem is generic. Take
> for example HID. Several drivers may share one transport, but the transport
> may be USB 2.0/3.0 or bluetooth.

In essence what you're saying is that we won't be able to do
link-suspend for HID until something like HID transport classes (or
something simpler, devoted specifically to runtime PM) is implemented.  
And likewise for other subsystems.  I can't argue with this conclusion.

Alan Stern

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