linux-kernel - Re: [PATCH] media: platform: exynos4-is: media-dev: Add missing of_node

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Date:	Tue, 26 Jan 2016 09:24:35 +0900
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	Amitoj Kaur Chawla <amitoj1606@...il.com>,
	kyungmin.park@...sung.com, s.nawrocki@...sung.com,
	mchehab@....samsung.com, kgene@...nel.org,
	linux-media@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	julia.lawall@...6.fr
Subject: Re: [PATCH] media: platform: exynos4-is: media-dev: Add missing
 of_node_put

On 26.01.2016 00:21, Amitoj Kaur Chawla wrote:
> for_each_available_child_of_node and for_each_child_of_node perform an
> of_node_get on each iteration, so to break out of the loop an of_node_put is
> required.
> 
> Found using Coccinelle. The simplified version of the semantic patch
> that is used for this is as follows:
> 
> // <smpl>
> @@
> local idexpression n;
> expression e,r;
> @@
> 
>  for_each_available_child_of_node(r,n) {
>    ...
> (
>    of_node_put(n);
> |
>    e = n
> |
> +  of_node_put(n);
> ?  break;
> )
>    ...
>  }
> ... when != n
> // </smpl>

Patch iselft looks correct but why are you pasting coccinelle script
into the message?

The script is already present in Linux kernel:
scripts/coccinelle/iterators/device_node_continue.cocci

This just extends the commit message without any meaningful data so with
removal of coccinelle script above:
Reviewed-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>

Best regards,
Krzysztof

> 
> Signed-off-by: Amitoj Kaur Chawla <amitoj1606@...il.com>
> ---
>  drivers/media/platform/exynos4-is/media-dev.c | 12 +++++++++---
>  1 file changed, 9 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/media/platform/exynos4-is/media-dev.c b/drivers/media/platform/exynos4-is/media-dev.c
> index 4f5586a..09f6e54 100644
> --- a/drivers/media/platform/exynos4-is/media-dev.c
> +++ b/drivers/media/platform/exynos4-is/media-dev.c
> @@ -430,8 +430,10 @@ static int fimc_md_register_sensor_entities(struct fimc_md *fmd)
>  			continue;
>  
>  		ret = fimc_md_parse_port_node(fmd, port, index);
> -		if (ret < 0)
> +		if (ret < 0) {
> +			of_node_put(node);
>  			goto rpm_put;
> +		}
>  		index++;
>  	}
>  
> @@ -442,8 +444,10 @@ static int fimc_md_register_sensor_entities(struct fimc_md *fmd)
>  
>  	for_each_child_of_node(ports, node) {
>  		ret = fimc_md_parse_port_node(fmd, node, index);
> -		if (ret < 0)
> +		if (ret < 0) {
> +			of_node_put(node);
>  			break;
> +		}
>  		index++;
>  	}
>  rpm_put:
> @@ -651,8 +655,10 @@ static int fimc_md_register_platform_entities(struct fimc_md *fmd,
>  			ret = fimc_md_register_platform_entity(fmd, pdev,
>  							plat_entity);
>  		put_device(&pdev->dev);
> -		if (ret < 0)
> +		if (ret < 0) {
> +			of_node_put(node);
>  			break;
> +		}
>  	}
>  
>  	return ret;
>