linux-kernel - Re: [PATCH 1/5] pinctrl: at91-pio4: add missing of_node

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Message-ID: <20180524075929.GA3750@rfolt0960.corp.atmel.com>
Date:   Thu, 24 May 2018 09:59:29 +0200
From:   Ludovic Desroches <ludovic.desroches@...rochip.com>
To:     Julia Lawall <Julia.Lawall@...6.fr>
CC:     Ludovic Desroches <ludovic.desroches@...rochip.com>,
        <kernel-janitors@...r.kernel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-gpio@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/5] pinctrl: at91-pio4: add missing of_node_put

On Wed, May 23, 2018 at 09:07:12PM +0200, Julia Lawall wrote:
> The device node iterators perform an of_node_get on each iteration, so a
> jump out of the loop requires an of_node_put.
> 
> The semantic patch that fixes this problem is as follows
> (http://coccinelle.lip6.fr):
> 
> // <smpl>
> @@
> expression root,e;
> local idexpression child;
> iterator name for_each_child_of_node;
> @@
> 
>  for_each_child_of_node(root, child) {
>    ... when != of_node_put(child)
>        when != e = child
> +  of_node_put(child);
> ?  break;
>    ...
> }
> ... when != child
> // </smpl>
> 
> Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>
Acked-by: Ludovic Desroches <ludovic.desroches@...rochip.com>

Thanks
> 
> ---
>  drivers/pinctrl/pinctrl-at91-pio4.c |    4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/pinctrl/pinctrl-at91-pio4.c b/drivers/pinctrl/pinctrl-at91-pio4.c
> index 4b57a13..bafb3d4 100644
> --- a/drivers/pinctrl/pinctrl-at91-pio4.c
> +++ b/drivers/pinctrl/pinctrl-at91-pio4.c
> @@ -576,8 +576,10 @@ static int atmel_pctl_dt_node_to_map(struct pinctrl_dev *pctldev,
>  		for_each_child_of_node(np_config, np) {
>  			ret = atmel_pctl_dt_subnode_to_map(pctldev, np, map,
>  						    &reserved_maps, num_maps);
> -			if (ret < 0)
> +			if (ret < 0) {
> +				of_node_put(np);
>  				break;
> +			}
>  		}
>  	}
>  
>