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

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Date:	Wed, 01 Apr 2015 14:40:50 +0200
From:	Oliver Neukum <oneukum@...e.de>
To:	Alan Stern <stern@...land.harvard.edu>
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 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?

	Regards
		Oliver



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