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

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Date:	Sat, 23 Jun 2007 09:54:26 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Jeff Mahoney <jeffm@...e.com>
Cc:	linux-kernel@...r.kernel.org, kraxel@...esex.org,
	Mauro Carvalho Chehab <mchehab@...radead.org>,
	stable@...nel.org
Subject: Re: [PATCH] saa7134: fix thread shutdown handling

> 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This is no longer applicable to the dvb devel tree, because this code has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?

-
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