linux-kernel - Re: [PATCH 6/6] USB / PM: Allow USB devices to remain runtime-suspended when sleeping

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Message-ID: <Pine.LNX.4.44L0.1504010959110.1420-100000@iolanthe.rowland.org>
Date:	Wed, 1 Apr 2015 10:01:31 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Oliver Neukum <oneukum@...e.de>
cc:	Tomeu Vizoso <tomeu.vizoso@...labora.com>,
	Linux-pm mailing list <linux-pm@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Scot Doyle <lkml14@...tdoyle.com>,
	Dan Williams <dan.j.williams@...el.com>,
	Julius Werner <jwerner@...omium.org>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Pratyush Anand <pratyush.anand@...com>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	USB list <linux-usb@...r.kernel.org>,
	Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 6/6] USB / PM: Allow USB devices to remain runtime-suspended
 when sleeping

On Wed, 1 Apr 2015, Oliver Neukum wrote:

> On Tue, 2015-03-31 at 13:09 -0400, Alan Stern wrote:
> > In other words, if the device is currently in runtime suspend with 
> > remote wakeup enabled, but device_may_wakeup() returns 0 (so that the 
> > device should be disabled for wakeup when the system goes into 
> > suspend), then the prepare callback has to return 0.
> > 
> > Therefore what you need to do here is something like this:
> > 
> >         struct usb_device       *udev = to_usb_device(dev);
> > 
> >         /* Return 0 if the current wakeup setting is wrong, otherwise
> > 1 */
> 
> And the other way round?

Your meaning isn't clear.  Are you asking what should happen if the 
device is in runtime suspend with remote wakeup disabled, but 
device_may_wakeup() returns 1?  That case should never happen -- but 
if it does then the prepare callback should return 0.

Alan Stern

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