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Subject: Re: [PATCH] iommu/exynos: add missing put_device() call in
 exynos_iommu_of_xlate()
To:     Yu Kuai <yukuai3@huawei.com>, joro@8bytes.org, kgene@kernel.org,
        krzk@kernel.org
Cc:     iommu@lists.linux-foundation.org,
        linux-arm-kernel@lists.infradead.org,
        linux-samsung-soc@vger.kernel.org, linux-kernel@vger.kernel.org,
        yi.zhang@huawei.com
From:   Marek Szyprowski <m.szyprowski@samsung.com>
Message-ID: <9f5b25ee-3dad-1798-fe55-9c1af9cde513@samsung.com>
Date:   Fri, 18 Sep 2020 17:27:59 +0200
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References: <CGME20200918011240eucas1p1e16e5b1b11a4ea6c078ffeceaf554966@eucas1p1.samsung.com>
        <20200918011335.909141-1-yukuai3@huawei.com>
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Hi

On 18.09.2020 03:13, Yu Kuai wrote:
> if of_find_device_by_node() succeed, exynos_iommu_of_xlate() doesn't have
> a corresponding put_device(). Thus add put_device() to fix the exception
> handling for this function implementation.
>
> Fixes: aa759fd376fb ("iommu/exynos: Add callback for initializing devices from device tree")
> Signed-off-by: Yu Kuai <yukuai3@huawei.com>

Thanks for the fix!

Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>

> ---
>   drivers/iommu/exynos-iommu.c | 8 ++++++--
>   1 file changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
> index bad3c0ce10cb..de324b4eedfe 100644
> --- a/drivers/iommu/exynos-iommu.c
> +++ b/drivers/iommu/exynos-iommu.c
> @@ -1295,13 +1295,17 @@ static int exynos_iommu_of_xlate(struct device *dev,
>   		return -ENODEV;
>   
>   	data = platform_get_drvdata(sysmmu);
> -	if (!data)
> +	if (!data) {
> +		put_device(&sysmmu->dev);
>   		return -ENODEV;
> +	}
>   
>   	if (!owner) {
>   		owner = kzalloc(sizeof(*owner), GFP_KERNEL);
> -		if (!owner)
> +		if (!owner) {
> +			put_device(&sysmmu->dev);
>   			return -ENOMEM;
> +		}
>   
>   		INIT_LIST_HEAD(&owner->controllers);
>   		mutex_init(&owner->rpm_lock);

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland