linux-kernel - Re: [PATCH 4/5] pinctrl: rockchip: add missing of_node

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Date:	Mon, 21 Dec 2015 22:20:02 +0100
From:	Heiko Stübner <heiko@...ech.de>
To:	Julia Lawall <Julia.Lawall@...6.fr>
Cc:	Linus Walleij <linus.walleij@...aro.org>,
	kernel-janitors@...r.kernel.org, linux-gpio@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/5] pinctrl: rockchip: add missing of_node_put

Hi Julia,

Am Montag, 21. Dezember 2015, 17:39:47 schrieb Julia Lawall:
> for_each_child_of_node performs an of_node_get on each iteration, so a
> return from 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>
> @@
> local idexpression n;
> expression e,e1;
> @@
> 
>  for_each_child_of_node(e1,n) {
>    ...
> (
>    of_node_put(n);
> 
>    e = n
> 
>    return n;
> 
> +  of_node_put(n);
> ?  return ...;
> )
>    ...
>  }
> // </smpl>
> 
> Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>

thanks for catching this :-)

I still remember how we talked about that same issue in the phy driver and the 
things for_each_child_of_node does when running, so

Reviewed-by: Heiko Stuebner <heiko@...ech.de>


Thanks
Heiko
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