linux-kernel - Re: [PATCH] media: atmel-isi: move of_node

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Date:   Mon, 4 Jun 2018 15:31:58 +0200
From:   Ludovic Desroches <ludovic.desroches@...rochip.com>
To:     Nicholas Mc Guire <hofrat@...ntech.at>
CC:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        <linux-media@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        Nicholas Mc Guire <hofrat@...dl.org>
Subject: Re: [PATCH] media: atmel-isi: move of_node_put() to cover success
 branch as well

On Fri, Jun 01, 2018 at 01:30:14PM +0000, Nicholas Mc Guire wrote:
> From: Nicholas Mc Guire <hofrat@...dl.org>
> 
> The of_node_put() was only covering the error branch but missed the 
> success branch so the refcount for ep which 
> of_graph_get_remote_port_parent() incremented on success would was
> not being decremented.
> 
> Signed-off-by: Nicholas Mc Guire <hofrat@...dl.org>
Acked-by: Ludovic Desroches <ludovic.desroches@...rochip.com>

Thanks

> ---
> 
> This patch is on top of: "media: atmel-isi: drop unnecessary while loop"
> 
> Patch was compile tested with: x86_64_defconfig + CONFIG_MEDIA_SUPPORT=y
> MEDIA_CAMERA_SUPPORT=y, CONFIG_MEDIA_CONTROLLER=y, V4L_PLATFORM_DRIVERS=y
> OF=y, CONFIG_COMPILE_TEST=y, CONFIG_VIDEO_ATMEL_ISI=y
> 
> Compile testing atmel-isi.c shows some sparse warnings. Seems to be due to
> sizeof operator being applied to a union (not related to the function being
> changed though).
> 
> Patch is against 4.17-rc7 (localversion-next is next-20180531)
> 
>  drivers/media/platform/atmel/atmel-isi.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/media/platform/atmel/atmel-isi.c b/drivers/media/platform/atmel/atmel-isi.c
> index 85fc7b9..e8db4df 100644
> --- a/drivers/media/platform/atmel/atmel-isi.c
> +++ b/drivers/media/platform/atmel/atmel-isi.c
> @@ -1111,10 +1111,9 @@ static int isi_graph_parse(struct atmel_isi *isi, struct device_node *node)
>  		return -EINVAL;
>  
>  	remote = of_graph_get_remote_port_parent(ep);
> -	if (!remote) {
> -		of_node_put(ep);
> +	of_node_put(ep);
> +	if (!remote)
>  		return -EINVAL;
> -	}
>  
>  	/* Remote node to connect */
>  	isi->entity.node = remote;
> -- 
> 2.1.4
>