linux-kernel - Re: [PATCH 3/17] arch/mips/kernel: Add missing read

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Date:	Wed, 26 May 2010 17:32:27 +0100
From:	Ralf Baechle <ralf@...ux-mips.org>
To:	Julia Lawall <julia@...u.dk>,
	"Kevin D. Kissell" <kevink@...alogos.com>
Cc:	linux-mips@...ux-mips.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 3/17] arch/mips/kernel: Add missing read_unlock

On Wed, May 26, 2010 at 05:54:55PM +0200, Julia Lawall wrote:

> From: Julia Lawall <julia@...u.dk>
> 
> Add a read_unlock missing on the error path.  Other ways of reaching
> out_unlock have tasklist_lock unlocked.
> 
> The semantic match that finds this problem is as follows:
> (http://coccinelle.lip6.fr/)
> 
> // <smpl>
> @@
> expression E1;
> @@
> 
> * read_lock(E1,...);
>   <+... when != E1
>   if (...) {
>     ... when != E1
> *   return ...;
>   }
>   ...+>
> * read_unlock(E1,...);
> // </smpl>
> 
> Signed-off-by: Julia Lawall <julia@...u.dk>
> 
> ---
> I wasn't able to find what security_task_setscheduler actually does.  
> If it releases tasklist_lock in an error case, then ignire this patch.

Your patch appears correct - and mipsmt_sys_sched_setaffinity() even
more broken than you thought.  It duplicates some code from kernel/sched.c
and has gotten out of sync.

Fixing that up.

   Ralf
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