linux-kernel - Re: USB_SUSPEND needs SUSPEND?

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Message-Id: <200710281948.37588.rjw@sisk.pl>
Date:	Sun, 28 Oct 2007 19:48:36 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Oliver Martin <oliver.martin@...dent.tuwien.ac.at>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	USB development list <linux-usb-devel@...ts.sourceforge.net>,
	Oliver Neukum <oliver@...kum.org>,
	Linux-pm mailing list <linux-pm@...ts.linux-foundation.org>
Subject: Re: USB_SUSPEND needs SUSPEND?

On Sunday, 28 October 2007 17:50, Alan Stern wrote:
> On Sun, 28 Oct 2007, Rafael J. Wysocki wrote:
> 
> > On Sunday, 28 October 2007 02:00, Oliver Martin wrote:
> > > Hello,
> > > 
> > > it seems that there is some dependency missing for CONFIG_USB_SUSPEND.
> > > When I compile a kernel without CONFIG_SUSPEND, USB suspend doesn't work
> > > (or at least doesn't expose its interface to userspace).
> > > /sys/bus/usb/devices/.../power doesn't exist, but it is there when I
> > > enable CONFIG_SUSPEND. So should CONFIG_USB_SUSPEND depend on
> > > CONFIG_SUSPEND (or something selected by CONFIG_SUSPEND)?
> > > 
> > > diff between the two configs follows, full config and dmesg for both
> > > kernels is available at http://stud4.tuwien.ac.at/~e0626486/usb_suspend/
> > > (though the dmesg diff doesn't seem to be all that interesting).
> 
> Actually I think the problem is the other way around.  /sys/.../power 
> should exist whenever CONFIG_PM is defined, not just when 
> CONFIG_SUSPEND is enabled.

Agreed.
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