Re: [PATCH 4/5] regulator: of: add missing of_node_put

[Krzysztof Kozlowski]

2015-10-10 21:30 GMT+09:00 Julia Lawall <Julia.Lawall@xxxxxxx>:
>
> 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.
>
> 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@xxxxxxx>
>
> ---
>  drivers/regulator/of_regulator.c |    1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/regulator/of_regulator.c b/drivers/regulator/of_regulator.c
> index 499e437..f9d77b4 100644
> --- a/drivers/regulator/of_regulator.c
> +++ b/drivers/regulator/of_regulator.c
> @@ -274,6 +274,7 @@ int of_regulator_match(struct device *dev, struct device_node *node,
>                                 dev_err(dev,
>                                         "failed to parse DT for regulator %s\n",
>                                         child->name);
> +                               of_node_put(child);

This looks good.

>                                 return -EINVAL;
>                         }
>                         match->of_node = of_node_get(child);

But what about 'break' few lines below? The reference from last
of_get_next_child() should be also dropped because... or we should
remove this of_node_get() call.

How about fixing also usage of for_each_available_child_of_node() in
regulator_of_get_init_data()?

Best regards,
Krzysztof
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