linux-kernel - Re: [PATCH] leds: tlc591xx: add missing of_node

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Date:   Sat, 15 Jul 2017 11:02:23 +0200
From:   Pavel Machek <pavel@....cz>
To:     Julia Lawall <Julia.Lawall@...6.fr>
Cc:     Richard Purdie <rpurdie@...ys.net>,
        kernel-janitors@...r.kernel.org,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        linux-leds@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] leds: tlc591xx: add missing of_node_put

On Sat 2017-07-15 09:48:53, Julia Lawall wrote:
> for_each_child_of_node performs an of_node_get on each iteration, so a
> return from the loop requires an of_node_put.
> 
> The semantic patch that fixes this problem is as follows
> (http://coccinelle.lip6.fr):
> 
> // <smpl>
> @@
> local idexpression n;
> expression e,e1;
> iterator name for_each_child_of_node;
> @@
> 
>  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>

Acked-by: Pavel Machek <pavel@....cz>

> @@ -230,12 +230,18 @@ tlc591xx_probe(struct i2c_client *client
>  
>  	for_each_child_of_node(np, child) {
>  		err = of_property_read_u32(child, "reg", &reg);
> -		if (err)
> +		if (err) {
> +			of_node_put(child);
>  			return err;
> -		if (reg < 0 || reg >= tlc591xx->max_leds)
> +		}
> +		if (reg < 0 || reg >= tlc591xx->max_leds) {
> +			of_node_put(child);
>  			return -EINVAL;
> -		if (priv->leds[reg].active)
> +		}
> +		if (priv->leds[reg].active) {
> +			of_node_put(child);
>  			return -EINVAL;
> +		}

I'd combine last two if()s into one...
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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