linux-kernel - Re: [PATCH 5/17] drivers/media/video/pvrusb2: Add missing mutex

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Date:	Thu, 27 May 2010 00:18:21 -0500 (CDT)
From:	Mike Isely <isely@...ly.net>
To:	Julia Lawall <julia@...u.dk>
cc:	Mauro Carvalho Chehab <mchehab@...radead.org>,
	linux-media@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	kernel-janitors@...r.kernel.org,
	Mike Isely at pobox <isely@...ox.com>
Subject: Re: [PATCH 5/17] drivers/media/video/pvrusb2: Add missing
 mutex_unlock


I looked through my revision history and that bug has been there in the 
driver source since at least May 2005, long before it was ever merged 
into the kernel.  Wow, what a great catch.  Thanks!

Acked-By: Mike Isely <isely@...ox.com>

  -Mike


On Wed, 26 May 2010, Julia Lawall wrote:

> From: Julia Lawall <julia@...u.dk>
> 
> Add a mutex_unlock missing on the error path.  In the other functions in
> the same file the locks and unlocks of this mutex appear to be balanced,
> so it would seem that the same should hold in this case.
> 
> The semantic match that finds this problem is as follows:
> (http://coccinelle.lip6.fr/)
> 
> // <smpl>
> @@
> expression E1;
> @@
> 
> * mutex_lock(E1,...);
>   <+... when != E1
>   if (...) {
>     ... when != E1
> *   return ...;
>   }
>   ...+>
> * mutex_unlock(E1,...);
> // </smpl>
> 
> Signed-off-by: Julia Lawall <julia@...u.dk>
> 
> ---
>  drivers/media/video/pvrusb2/pvrusb2-ioread.c |    5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/media/video/pvrusb2/pvrusb2-ioread.c b/drivers/media/video/pvrusb2/pvrusb2-ioread.c
> index b482478..bba6115 100644
> --- a/drivers/media/video/pvrusb2/pvrusb2-ioread.c
> +++ b/drivers/media/video/pvrusb2/pvrusb2-ioread.c
> @@ -223,7 +223,10 @@ int pvr2_ioread_setup(struct pvr2_ioread *cp,struct pvr2_stream *sp)
>  				   " pvr2_ioread_setup (setup) id=%p",cp);
>  			pvr2_stream_kill(sp);
>  			ret = pvr2_stream_set_buffer_count(sp,BUFFER_COUNT);
> -			if (ret < 0) return ret;
> +			if (ret < 0) {
> +				mutex_unlock(&cp->mutex);
> +				return ret;
> +			}
>  			for (idx = 0; idx < BUFFER_COUNT; idx++) {
>  				bp = pvr2_stream_get_buffer(sp,idx);
>  				pvr2_buffer_set_buffer(bp,
> --
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-- 

Mike Isely
isely @ isely (dot) net
PGP: 03 54 43 4D 75 E5 CC 92 71 16 01 E2 B5 F5 C1 E8
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