linux-kernel - Re: [PATCH] Fix tosakbd suspend

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Date:	Wed, 2 Apr 2008 01:51:28 +0400
From:	Dmitry <dbaryshkov@...il.com>
To:	"Dmitry Torokhov" <dmitry.torokhov@...il.com>
Cc:	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Fix tosakbd suspend

Hi,

2008/4/1, Dmitry Torokhov <dmitry.torokhov@...il.com>:
> On Tue, Apr 01, 2008 at 04:27:38PM +0300, Dmitry wrote:
>  > Hi, Dmitry,
>  >
>  > 2008/4/1, Dmitry Torokhov <dmitry.torokhov@...il.com>:
>  > > Hi Dmitry,
>  > >
>  > >
>  > >  On Tue, Apr 01, 2008 at 01:38:01AM +0400, Dmitry Baryshkov wrote:
>  > >  > Signed-off-by: Dmitry Baryshkov <dbaryshkov@...il.com>
>  > >  > ---
>  > >  >  drivers/input/keyboard/tosakbd.c |    3 +++
>  > >  >  1 files changed, 3 insertions(+), 0 deletions(-)
>  > >  >
>  > >  > diff --git a/drivers/input/keyboard/tosakbd.c b/drivers/input/keyboard/tosakbd.c
>  > >  > index 3884d1e..306cbe8 100644
>  > >  > --- a/drivers/input/keyboard/tosakbd.c
>  > >  > +++ b/drivers/input/keyboard/tosakbd.c
>  > >  > @@ -210,6 +210,9 @@ static int tosakbd_suspend(struct platform_device *dev, pm_message_t state)
>  > >  >
>  > >  >       del_timer_sync(&tosakbd->timer);
>  > >  >
>  > >
>  > >
>  > > What if interrupt comes here? The whole suspend path seems racy with
>  > >  interrup handler/timer.
>  >
>  > What is the best way to fix it? Moving from suspend to suspend_late
>  > seems to be a hack.
>  > Should I call a bunch of disable_irq or just introduce an atomic flag?
>  >
>
>
> How about we take the lock in tosakbd_suspend, set flag indicating that the
>  picece is suspended, do the discharge and then del_timer_sync()? If you change
>  tosakbd_scankeyboard() to check for suspend flag and exit as soon as it sees it
>  it should take care of the most of the issues I think. Something like this:

This should do the trick. I'll test the patch tomorrow.

-- 
With best wishes
Dmitry
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