linux-kernel - Re: [linux-pm] wacom + runtime PM = AA deadlock

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Date:	Tue, 14 Sep 2010 17:30:38 +0200
From:	Oliver Neukum <oneukum@...e.de>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Jiri Slaby <jslaby@...e.cz>, Dmitry Torokhov <dtor@...l.ru>,
	pingc@...om.com, "linux-pm" <linux-pm@...ts.linux-foundation.org>,
	Linux kernel mailing list <linux-kernel@...r.kernel.org>,
	linux-input@...r.kernel.org
Subject: Re: [linux-pm] wacom + runtime PM = AA deadlock

Am Dienstag, 14. September 2010, 17:23:15 schrieb Alan Stern:
> On Tue, 14 Sep 2010, Oliver Neukum wrote:
> 
> > > > Should I have used usb_autopm_get_interface_no_resume()?
> > > 
> > > That actually would work.  It's a good idea.  The only drawback (not a
> > > big one) is that if the device _was_ suspended with remote wakeup
> > > enabled, doing this wouldn't turn off remote wakeup.  I think that
> > > doesn't matter.
> > 
> > I am afraid it does matter as devices whose remote wakeup is enabled
> > may draw more power.
> 
> I doubt it, or at least, not very much more.  They are still limited by 
> the USB spec as to the total amount of current they can draw while 
> suspended.

7.2.3 Sources of remote wakeup may draw 2.5mA when suspended
as opposed to 0.5 mA

	Regards
		Oliver
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