linux-kernel - Re: [linux-usb-devel] 2.6.19-rc5 regression: can't disable OHCI wakeup via sysfs

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Date:	Sun, 12 Nov 2006 11:31:24 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Andrey Borzenkov <arvidjaar@...l.ru>
cc:	David Brownell <david-b@...bell.net>,
	<linux-usb-devel@...ts.sourceforge.net>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [linux-usb-devel] 2.6.19-rc5 regression: can't disable OHCI
 wakeup via sysfs

On Sat, 11 Nov 2006, Andrey Borzenkov wrote:

> On Tuesday 20 June 2006 00:12, David Brownell wrote:
> > > > > > An alternative (but post-boot) workaround _should_ be
> > > > > >
> > > > > >     echo disabled > /sys/bus/pci/devices/0000:00:02.0/power/wakeup
> > > >
> > > > Did that work?
> > >
> > > No. But
> > >
> > > 	echo -n disabled >
> > > /sys/devices/pci0000:00/0000:00:02.0/usb1/power/wakeup
> >
> > That's what I meant ... thanks, and sorry for the confusion.
> 
> this does not work anymore in current rc5. After writing 
> cat /sys/devices/pci0000:00/0000:00:02.0/usb1/power/wakeup shows "disabled" 
> but messages continue to be logged.
> 
> Anything I can do to help narrow it down?

Undoubtedly this change in behavior is caused by the "autostop" code I 
added to ohci-hcd.  It doesn't check the "wakeup" attribute.

Dave, is there any clue about exactly what triggers the immediate wakeup?  
If you could tell me what to test for, I could try writing a patch to fix 
it.  Perhaps the driver needs a "resume_detect_is_broken" quirk.

Andrey, if you aren't using USB at all (you mentioned that no devices were 
plugged in), you can simply do "rmmod ohci-hcd" to stop all those log 
messages.

Alan Stern

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