linux-kernel - Re: [PATCH] of: remove the unnecessary of_node_put for of_parse_phandle_with

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Date:	Wed, 10 Apr 2013 19:03:27 +1000
From:	Stephen Rothwell <sfr@...b.auug.org.au>
To:	<Yuantian.Tang@...escale.com>
Cc:	<grant.likely@...retlab.ca>, devicetree-discuss@...ts.ozlabs.org,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	rob.herring@...xeda.com
Subject: Re: [PATCH] of: remove the unnecessary of_node_put for
 of_parse_phandle_with_args()

Hi,

On Tue, 9 Apr 2013 14:56:09 +0800 <Yuantian.Tang@...escale.com> wrote:
>
> From: Tang Yuantian <yuantian.tang@...escale.com>
> 
> As the function itself says it is caller's responsibility to call the
> of_node_put().  So, remove it on success to keep the reference count
> correct.
> 
> Signed-off-by: Tang Yuantian <Yuantian.Tang@...escale.com>
> ---
>  drivers/of/base.c | 3 ---
>  1 file changed, 3 deletions(-)
> 
> diff --git a/drivers/of/base.c b/drivers/of/base.c
> index 321d3ef..e8b4c28 100644
> --- a/drivers/of/base.c
> +++ b/drivers/of/base.c
> @@ -1168,9 +1168,6 @@ static int __of_parse_phandle_with_args(const struct device_node *np,
>  					out_args->args[i] = be32_to_cpup(list++);
>  			}
>  
> -			/* Found it! return success */
> -			if (node)
> -				of_node_put(node);

Actually, if out_args is NULL, you should do the of_node_put(node), so
probably the correct fix is to add an "else" before the above "if" (and
move the comment).

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

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