linux-kernel - Re: [PATCH 4/7] hvc_console: Fix race between hvc_close and hvc

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Date:	Fri, 26 Mar 2010 07:31:11 +0530
From:	Amit Shah <amit.shah@...hat.com>
To:	Anton Blanchard <anton@...ba.org>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org,
	Rusty Russell <rusty@...tcorp.com.au>,
	Alan Cox <alan@...rguk.ukuu.org.uk>, tglx@...utronix.de,
	mingo@...e.hu, a.p.zijlstra@...llo.nl
Subject: Re: [PATCH 4/7] hvc_console: Fix race between hvc_close and
	hvc_remove

On (Fri) Mar 26 2010 [10:30:31], Anton Blanchard wrote:
>  
> Hi,
> 
> > And this suggests that hvc_kick() is called before hvc_task is
> > initialised, ie, before hvc_init() is called.
> >
> > Does this help?
> 
> Looks good, tests OK on my POWER5 box. Thanks!
> 
> Tested-by: Anton Blanchard <anton@...ba.org>

Thanks. Before I submit this patch, though, I'd like to see why
hvc_kick() gets called before hvc_init. If I can get to it real quick,
I'll do it, else I'll just queue this one up.

> > diff --git a/drivers/char/hvc_console.c b/drivers/char/hvc_console.c
> > index ba55bba..50ac983 100644
> > --- a/drivers/char/hvc_console.c
> > +++ b/drivers/char/hvc_console.c
> > @@ -285,6 +285,9 @@ EXPORT_SYMBOL_GPL(hvc_instantiate);
> >  /* Wake the sleeping khvcd */
> >  void hvc_kick(void)
> >  {
> > +       if (!hvc_task)
> > +               return;
> > +
> >         hvc_kicked = 1;
> >         wake_up_process(hvc_task);
> >  }

		Amit
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