linux-kernel - Re: [PATCH 2/2] arch/powerpc/platforms/powermac/setup.c: add missing of_node

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Message-ID: <4E522AD0.7030907@bfs.de>
Date:	Mon, 22 Aug 2011 12:09:20 +0200
From:	walter harms <wharms@....de>
To:	Julia Lawall <julia@...u.dk>
CC:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	kernel-janitors@...r.kernel.org, Paul Mackerras <paulus@...ba.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	devicetree-discuss@...ts.ozlabs.org
Subject: Re: [PATCH 2/2] arch/powerpc/platforms/powermac/setup.c: add missing
 of_node_put



Am 21.08.2011 18:10, schrieb Julia Lawall:
> 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>
> 
> ---
>  arch/powerpc/platforms/powermac/setup.c |    8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/powerpc/platforms/powermac/setup.c b/arch/powerpc/platforms/powermac/setup.c
> index 96580b1..970ea1d 100644
> --- a/arch/powerpc/platforms/powermac/setup.c
> +++ b/arch/powerpc/platforms/powermac/setup.c
> @@ -494,11 +494,15 @@ static int __init pmac_declare_of_platform_devices(void)
>  		return -1;
>  
>  	np = of_find_node_by_name(NULL, "valkyrie");
> -	if (np)
> +	if (np) {
>  		of_platform_device_create(np, "valkyrie", NULL);
> +		of_node_put(np);
> +	}
>  	np = of_find_node_by_name(NULL, "platinum");
> -	if (np)
> +	if (np) {
>  		of_platform_device_create(np, "platinum", NULL);
> +		of_node_put(np);
> +	}
>          np = of_find_node_by_type(NULL, "smu");
>          if (np) {
>  		of_platform_device_create(np, "smu", NULL);
> 


hi,
it seems save to call of_node_put(np) with np==NULL, i assume the same is true
for of_platform_device_create().

so the code collapses to:

_test_node(char *name)
{
 struct device_node *np;
 np = of_find_node_by_name(NULL, name);
 of_platform_device_create(np, name, NULL);
 of_node_put(np);
 return NULL?:0:1;
}

maybe there is already something like find_node() ?

re,
 wh




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