linux-kernel - Re: [PATCH] saa7134: fix thread shutdown handling

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Message-Id: <1182624421.10174.30.camel@gaivota>
Date:	Sat, 23 Jun 2007 15:47:01 -0300
From:	Mauro Carvalho Chehab <mchehab@...radead.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Jeff Mahoney <jeffm@...e.com>, linux-kernel@...r.kernel.org,
	kraxel@...esex.org, stable@...nel.org
Subject: Re: [PATCH] saa7134: fix thread shutdown handling

Em Sáb, 2007-06-23 às 09:54 -0700, Andrew Morton escreveu:
> > On Thu, 21 Jun 2007 14:45:22 -0400 Jeff Mahoney <jeffm@...e.com> wrote:
> >  This patch changes the test for the thread pid from >= 0 to > 0.
> > 
> >  When the saa8134 driver initialization fails after a certain point,
> >  it goes through the complete shutdown process for the driver. Part
> >  of shutting it down includes tearing down the thread for tv audio.
> > 
> >  The test for tearing down the thread tests for >= 0. Since the dev
> >  structure is kzalloc'd, the test will always be true if we haven't
> >  tried to start the thread yet. We end up waiting on pid 0 to complete,
> >  which will never happen, so we lock up.
> > 
> >  This bug was observed in Novell Bugzilla 284718, when request_irq()
> >  failed.
> > 
> > Signed-off-by: Jeff Mahoney <jeffm@...e.com>
> > 
> > ---
> > 
> >  drivers/media/video/saa7134/saa7134-tvaudio.c |    2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > --- a/drivers/media/video/saa7134/saa7134-tvaudio.c	2007-06-12 15:45:16.000000000 -0400
> > +++ b/drivers/media/video/saa7134/saa7134-tvaudio.c	2007-06-15 14:16:14.000000000 -0400
> > @@ -1005,7 +1005,7 @@
> >  int saa7134_tvaudio_fini(struct saa7134_dev *dev)
> >  {
> >  	/* shutdown tvaudio thread */
> > -	if (dev->thread.pid >= 0) {
> > +	if (dev->thread.pid > 0) {
> >  		dev->thread.shutdown = 1;
> >  		wake_up_interruptible(&dev->thread.wq);
> >  		wait_for_completion(&dev->thread.exit);
> > 
> 
> This is no longer applicable to the dvb devel tree, because this code has
> been converted to the kthread API.
> 
> However I guess we do want this in 2.6.22 and in 2.6.21.x.  Mauro, if
> that's OK, do you want me to do the merges?

Yes, please, Andrew. I'm OK on merging this for the -stable trees.
> 
-- 
Cheers,
Mauro

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