linux-kernel - Re: [PATCH v3 1/8] [media] soc_camera: Do not decrement endpoint node refcount in the loop

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Date:	Sat, 20 Sep 2014 09:24:38 +0200 (CEST)
From:	Guennadi Liakhovetski <g.liakhovetski@....de>
To:	Philipp Zabel <p.zabel@...gutronix.de>
cc:	linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
	devel@...verdev.osuosl.org, Grant Likely <grant.likely@...aro.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Mauro Carvalho Chehab <m.chehab@...sung.com>,
	Russell King <rmk+kernel@....linux.org.uk>,
	kernel@...gutronix.de
Subject: Re: [PATCH v3 1/8] [media] soc_camera: Do not decrement endpoint
 node refcount in the loop

Hi Philippe,

On Thu, 11 Sep 2014, Philipp Zabel wrote:

> In preparation for a following patch, stop decrementing the endpoint node
> refcount in the loop. This temporarily leaks a reference to the endpoint node,
> which will be fixed by having of_graph_get_next_endpoint decrement the refcount
> of its prev argument instead.
> 
> Signed-off-by: Philipp Zabel <p.zabel@...gutronix.de>
> ---
>  drivers/media/platform/soc_camera/soc_camera.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/media/platform/soc_camera/soc_camera.c b/drivers/media/platform/soc_camera/soc_camera.c
> index f4308fe..f752489 100644
> --- a/drivers/media/platform/soc_camera/soc_camera.c
> +++ b/drivers/media/platform/soc_camera/soc_camera.c
> @@ -1696,11 +1696,11 @@ static void scan_of_host(struct soc_camera_host *ici)
>  		if (!i)
>  			soc_of_bind(ici, epn, ren->parent);
>  
> -		of_node_put(epn);
>  		of_node_put(ren);
>  
>  		if (i) {
>  			dev_err(dev, "multiple subdevices aren't supported yet!\n");
> +			of_node_put(epn);

Sorry, this doesn't look right to me. I think you want to drop the last 
reference _after_ the loop, not in this temporary check for multiple 
endpoints, which your patch has nothing to do with.

Thanks
Guennadi

>  			break;
>  		}
>  	}
> -- 
> 2.1.0
> 
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