linux-kernel - Re: [PATCH 9/9] pinctrl: at91: add missing of_node

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Date:	Mon, 26 Oct 2015 10:52:32 +0100
From:	Ludovic Desroches <ludovic.desroches@...el.com>
To:	Julia Lawall <Julia.Lawall@...6.fr>
CC:	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	<kernel-janitors@...r.kernel.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-gpio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Andrew Lunn <andrew@...n.ch>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Jason Cooper <jason@...edaemon.net>
Subject: Re: [PATCH 9/9] pinctrl: at91: add missing of_node_put

On Sat, Oct 24, 2015 at 04:42:35PM +0200, Julia Lawall wrote:
> for_each_child_of_node performs an of_node_get on each iteration, so
> a break out of the loop requires an of_node_put.
> 
> A simplified version of the semantic patch that fixes this problem is as
> follows (http://coccinelle.lip6.fr):
> 
> // <smpl>
> @@
> expression root,e;
> local idexpression child;
> @@
> 
>  for_each_child_of_node(root, child) {
>    ... when != of_node_put(child)
>        when != e = child
> (
>    return child;
> |
> +  of_node_put(child);
> ?  return ...;
> )
>    ...
>  }
> // </smpl>
> 
> Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>
Acked-by: Ludovic Desroches <ludovic.desroches@...el.com>

> 
> ---
>  drivers/pinctrl/pinctrl-at91.c |    5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/pinctrl/pinctrl-at91.c b/drivers/pinctrl/pinctrl-at91.c
> index ce6e589..0d2fc0c 100644
> --- a/drivers/pinctrl/pinctrl-at91.c
> +++ b/drivers/pinctrl/pinctrl-at91.c
> @@ -1122,8 +1122,10 @@ static int at91_pinctrl_parse_functions(struct device_node *np,
>  		func->groups[i] = child->name;
>  		grp = &info->groups[grp_index++];
>  		ret = at91_pinctrl_parse_groups(child, grp, info, i++);
> -		if (ret)
> +		if (ret) {
> +			of_node_put(child);
>  			return ret;
> +		}
>  	}
>  
>  	return 0;
> @@ -1196,6 +1198,7 @@ static int at91_pinctrl_probe_dt(struct platform_device *pdev,
>  		ret = at91_pinctrl_parse_functions(child, info, i++);
>  		if (ret) {
>  			dev_err(&pdev->dev, "failed to parse function\n");
> +			of_node_put(child);
>  			return ret;
>  		}
>  	}
> 
> --
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