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

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Date:	Sun, 12 Jun 2011 22:41:59 +0300
From:	"Winkler, Tomas" <tomas.winkler@...el.com>
To:	Arkadiusz Miskiewicz <a.miskiewicz@...il.com>
CC:	"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



> -----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

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