linux-kernel - Re: [PATCH 4/4] drm/sun4i: backend: add missing of_node

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Date:   Wed, 16 Jan 2019 09:59:13 +0100
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Julia Lawall <Julia.Lawall@...6.fr>
Cc:     kernel-janitors@...r.kernel.org, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, Chen-Yu Tsai <wens@...e.org>,
        dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] drm/sun4i: backend: add missing of_node_puts

On Sun, Jan 13, 2019 at 09:47:44AM +0100, 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.
> 
> Remote and port also have augmented reference counts, so drop them
> on each iteration and at the end of the function, respectively.
> Remote is only used for the address it contains, not for the
> contents of that address, so the reference count can be dropped
> immediately.
> 
> The semantic patch that fixes the first part of 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_available_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>

Applied, thanks!
Maxime

-- 
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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