linux-kernel - Re: [PATCH 03/18] software_node: Fix failure to put() and get() references to children in software_node_get_next

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Message-ID: <20201130161037.GF14465@pendragon.ideasonboard.com>
Date:   Mon, 30 Nov 2020 18:10:37 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Daniel Scally <djrscally@...il.com>
Cc:     linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
        linux-gpio@...r.kernel.org, linux-i2c@...r.kernel.org,
        linux-media@...r.kernel.org, devel@...ica.org, rjw@...ysocki.net,
        lenb@...nel.org, gregkh@...uxfoundation.org,
        mika.westerberg@...ux.intel.com, andriy.shevchenko@...ux.intel.com,
        linus.walleij@...aro.org, bgolaszewski@...libre.com,
        wsa@...nel.org, yong.zhi@...el.com, sakari.ailus@...ux.intel.com,
        bingbu.cao@...el.com, tian.shu.qiu@...el.com, mchehab@...nel.org,
        robert.moore@...el.com, erik.kaneda@...el.com, pmladek@...e.com,
        rostedt@...dmis.org, sergey.senozhatsky@...il.com,
        linux@...musvillemoes.dk, kieran.bingham+renesas@...asonboard.com,
        jacopo+renesas@...ndi.org,
        laurent.pinchart+renesas@...asonboard.com,
        jorhand@...ux.microsoft.com, kitakar@...il.com,
        heikki.krogerus@...ux.intel.com
Subject: Re: [PATCH 03/18] software_node: Fix failure to put() and get()
 references to children in software_node_get_next_child()

Hi Daniel,

Thank you for the patch.

On Mon, Nov 30, 2020 at 01:31:14PM +0000, Daniel Scally wrote:
> The software_node_get_next_child() function currently does not hold
> references to the child software_node that it finds or put the ref that
> is held against the old child - fix that.
> 
> Signed-off-by: Daniel Scally <djrscally@...il.com>

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

> ---
> Changes since RFC v3:
> 
> 	Put reference to previous child.
> 
>  drivers/base/swnode.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/base/swnode.c b/drivers/base/swnode.c
> index 010828fc785b..615a0c93e116 100644
> --- a/drivers/base/swnode.c
> +++ b/drivers/base/swnode.c
> @@ -443,14 +443,18 @@ software_node_get_next_child(const struct fwnode_handle *fwnode,
>  	struct swnode *c = to_swnode(child);
>  
>  	if (!p || list_empty(&p->children) ||
> -	    (c && list_is_last(&c->entry, &p->children)))
> +	    (c && list_is_last(&c->entry, &p->children))) {
> +		fwnode_handle_put(child);
>  		return NULL;
> +	}
>  
>  	if (c)
>  		c = list_next_entry(c, entry);
>  	else
>  		c = list_first_entry(&p->children, struct swnode, entry);
> -	return &c->fwnode;
> +
> +	fwnode_handle_put(child);
> +	return fwnode_handle_get(&c->fwnode);
>  }
>  
>  static struct fwnode_handle *

-- 
Regards,

Laurent Pinchart