linux-kernel - Re: [PATCH 1/2] arch/powerpc/platforms/cell/iommu.c: add missing of_node

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Message-Id: <201108291326.49561.arnd@arndb.de>
Date:	Mon, 29 Aug 2011 13:26:49 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Julia Lawall <julia@...u.dk>
Cc:	kernel-janitors@...r.kernel.org,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	linuxppc-dev@...ts.ozlabs.org, cbe-oss-dev@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org, devicetree-discuss@...ts.ozlabs.org
Subject: Re: [PATCH 1/2] arch/powerpc/platforms/cell/iommu.c: add missing of_node_put

On Sunday 21 August 2011, Julia Lawall wrote:
> From: Julia Lawall <julia@...u.dk>
> 
> np is initialized to the result of calling a function that calls
> of_node_get, so of_node_put should be called before the pointer is dropped.
> 
> The semantic match that finds this problem is as follows:
> (http://coccinelle.lip6.fr/)
> 
> // <smpl>
> @@
> expression e,e1,e2;
> @@
> 
> * e = \(of_find_node_by_type\|of_find_node_by_name\)(...)
>   ... when != of_node_put(e)
>       when != true e == NULL
>       when != e2 = e
>   e = e1
> // </smpl>
> 
> Signed-off-by: Julia Lawall <julia@...u.dk>
> 
Acked-by: Arnd Bergmann <arnd@...db.de>
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