linux-kernel - Re: [PATCH v3 01/10] software node: Get reference to parent swnode in get

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Date:   Fri, 30 Aug 2019 15:26:12 +0300
From:   Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:     Sakari Ailus <sakari.ailus@...ux.intel.com>
Cc:     Petr Mladek <pmladek@...e.com>, linux-kernel@...r.kernel.org,
        rafael@...nel.org,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-acpi@...r.kernel.org, devicetree@...r.kernel.org,
        Rob Herring <robh@...nel.org>
Subject: Re: [PATCH v3 01/10] software node: Get reference to parent swnode
 in get_parent op

On Thu, Aug 29, 2019 at 01:10:34PM +0300, Sakari Ailus wrote:
> The software_node_get_parent() returned a pointer to the parent swnode,
> but did not take a reference to it, leading the caller to put a reference
> that was not taken. Take that reference now.
> 
> Fixes: 59abd83672f7 ("drivers: base: Introducing software nodes to the
> 		      firmware node framework")
> Signed-off-by: Sakari Ailus <sakari.ailus@...ux.intel.com>

Reviewed-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>

> ---
>  drivers/base/swnode.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/base/swnode.c b/drivers/base/swnode.c
> index e7b3aa3bd55ad..a7cb41812cfda 100644
> --- a/drivers/base/swnode.c
> +++ b/drivers/base/swnode.c
> @@ -520,7 +520,10 @@ software_node_get_parent(const struct fwnode_handle *fwnode)
>  {
>  	struct swnode *swnode = to_swnode(fwnode);
>  
> -	return swnode ? (swnode->parent ? &swnode->parent->fwnode : NULL) : NULL;
> +	if (!swnode || !swnode->parent)
> +		return NULL;
> +
> +	return fwnode_handle_get(&swnode->parent->fwnode);
>  }
>  
>  static struct fwnode_handle *
> -- 
> 2.20.1

thanks,

-- 
heikki