linux-kernel - Re: mei driver breaks suspend on 3.0git

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Date:	Tue, 21 Jun 2011 20:39:54 +0200
From:	Marc Koschewski <marc@...nowledge.org>
To:	"Winkler, Tomas" <tomas.winkler@...el.com>
Cc:	Arkadiusz Miskiewicz <a.miskiewicz@...il.com>,
	"Weil, Oren jer" <oren.jer.weil@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: mei driver breaks suspend on 3.0git

* Winkler, Tomas <tomas.winkler@...el.com> [2011-06-12 22:41:59 +0300]:

I suffer the same. After booting 3.0.0-r4 with that module not being loaded
it suspends, however, it doesn't resume (screen black, hard power-off needed).

Regards,
Marc

> 
> 
> > -----Original Message-----
> > From: Arkadiusz Miskiewicz [mailto:a.miskiewicz@...il.com]
> > Sent: Sunday, June 12, 2011 9:40 PM
> > To: Winkler, Tomas
> > Cc: Weil, Oren jer; linux-kernel@...r.kernel.org
> > Subject: Re: mei driver breaks suspend on 3.0git
> > 
> > On Sunday 12 of June 2011, Arkadiusz Miskiewicz wrote:
> > > On Sunday 12 of June 2011, Arkadiusz Miskiewicz wrote:
> > > > On Sunday 12 of June 2011, Winkler, Tomas wrote:
> > > > > > -----Original Message-----
> > > > > > From: Weil, Oren jer
> > > > > > Sent: Sunday, June 12, 2011 8:36 PM
> > > > > > To: Arkadiusz Miskiewicz
> > > > > > Cc: Winkler, Tomas; linux-kernel@...r.kernel.org
> > > > > > Subject: RE: mei driver breaks suspend on 3.0git
> > > > > >
> > > > > > >It's thinkpad t400 with
> > > > > > >00:03.0 Communication controller [0780]: Intel Corporation
> > > > > > >Mobile 4 Series Chipset MEI Controller [8086:2a44] (rev 07)
> > > > > >
> > > > > > Can you send us more details? Does it happened in stress? How do
> > > > > > I reproduce it?
> > > >
> > > > No stress. This is my daily use notebook and I simply suspend to ram
> > > > when sitting under X in kde4.
> > > >
> > > > > > Can you send us the debug prints?
> > > >
> > > > Attached. suspend starts, tries to resume devices, MEI suspend fails
> > > > causing whole suspend to be aborted.
> > >
> > > Shouldn't ret > 0 in mei_wd_stop to be "success"?
> > 
> > I meant this one:
> > 
> >         ret = wait_event_interruptible_timeout(dev->wait_stop_wd,
> >                                         dev->wd_stopped, 10 * HZ);
> > 
> > 
> > And that was possible untested solution that relies on wd being stopped and
> > not anything else.
> > 
> > >
> > > diff --git a/drivers/staging/mei/wd.c b/drivers/staging/mei/wd.c index
> > > 2564b03..608245a 100644
> > > --- a/drivers/staging/mei/wd.c
> > > +++ b/drivers/staging/mei/wd.c
> > > @@ -171,8 +171,10 @@ int mei_wd_stop(struct mei_device *dev, bool
> > preserve)
> > >         mutex_lock(&dev->device_lock);
> > >         if (!dev->wd_stopped)
> > >                 dev_dbg(&dev->pdev->dev, "stop wd failed to complete.\n");
> > > -       else
> > > +       else {
> > > +               ret = 0;
> > >                 dev_dbg(&dev->pdev->dev, "stop wd complete.\n");
> > > +       }
> > >
> > >         if (preserve)
> > >                 dev->wd_timeout = wd_timeout;
> > 
> 
> Looks like your patch is correct 
> wait_event_interruptible_timeout() returns  >0 on success unlike wait_even_interruptable()
> 
> I wil check all the instances we have and issue a patch.
> Thanks for your effort
> Tomas
> 
> ---------------------------------------------------------------------
> Intel Israel (74) Limited
> 
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-- 
Marc Koschewski
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