linux-kernel - Re: [PATCH 2/4] drivers/macintosh/smu.c: add missing of_node

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Date:	Mon, 9 Jun 2008 23:07:52 +1000
From:	Stephen Rothwell <sfr@...b.auug.org.au>
To:	Julia Lawall <julia@...u.dk>
Cc:	benh@...nel.crashing.org, linuxppc-dev@...abs.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 2/4] drivers/macintosh/smu.c: add missing of_node_put

On Mon, 9 Jun 2008 14:20:42 +0200 (CEST) Julia Lawall <julia@...u.dk> wrote:
>
> From: Julia Lawall <julia@...u.dk>
> 
> of_node_put is needed before discarding a value received from
> of_find_node_by_type, eg in error handling code.
> 
> The semantic patch that makes the change is as follows:
> (http://www.emn.fr/x-info/coccinelle/)
> 
> // <smpl>
> @@
> struct device_node *n;
> struct device_node *n1;
> struct device_node *n2;
> statement S;
> identifier f1,f2;
> expression E1,E2;
> constant C;
> @@
> 
> n = of_find_node_by_type(...)
> ...
> if (!n) S
> ... when != of_node_put(n)
>     when != n1 = f1(n,...)
>     when != E1 = n
>     when any
>     when strict
> (
> + of_node_put(n);
>   return -C;
> |
>   of_node_put(n);
> |
>   n2 = f2(n,...)
> |
>   E2 = n
> |
>   return ...;
> )
> // </smpl>
> 
> Signed-off-by: Julia Lawall <julia@...u.dk>

Acked-by: Stephen Rothwell <sfr@...b.auug.org.au>

However, the error handling in that routine (smu_init) needs much more
work.

-- 
Cheers,
Stephen Rothwell                    sfr@...b.auug.org.au
http://www.canb.auug.org.au/~sfr/

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