Message-ID: <570B1181.706@rock-chips.com>
Date: Mon, 11 Apr 2016 10:52:49 +0800
From: Mark yao <mark.yao@rock-chips.com>
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To: John Keeping <john@metanate.com>
CC: Heiko Stuebner <heiko@sntech.de>, dri-devel@lists.freedesktop.org,
        linux-arm-kernel@lists.infradead.org,
        linux-rockchip@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/2] drm/rockchip: don't leak iommu mapping
References: <1459864232-25033-1-git-send-email-john@metanate.com> <1459864232-25033-2-git-send-email-john@metanate.com>
In-Reply-To: <1459864232-25033-2-git-send-email-john@metanate.com>
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On 2016年04月05日 21:50, John Keeping wrote:
> arm_iommu_attach_device() takes its own reference to the mapping we give
> it.  Since we do not keep a reference to the mapping ourselves, we must
> release it before returning.
>
> Also fix the error path, which fails to release the mapping if it has
> called arm_iommu_detach_device() since that clears archdata.mapping.
>
> Signed-off-by: John Keeping <john@metanate.com>
> ---
>   drivers/gpu/drm/rockchip/rockchip_drm_drv.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
> index 7695c79..1e2d88b 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
> @@ -218,6 +218,7 @@ static int rockchip_drm_load(struct drm_device *drm_dev, unsigned long flags)
>   	if (ret)
>   		goto err_vblank_cleanup;
>   
> +	arm_iommu_release_mapping(mapping);
>   	return 0;
>   err_vblank_cleanup:
>   	drm_vblank_cleanup(drm_dev);
> @@ -228,7 +229,7 @@ err_unbind:
>   err_detach_device:
>   	arm_iommu_detach_device(dev);
>   err_release_mapping:
> -	arm_iommu_release_mapping(dev->archdata.mapping);
> +	arm_iommu_release_mapping(mapping);
>   err_config_cleanup:
>   	drm_mode_config_cleanup(drm_dev);
>   	drm_dev->dev_private = NULL;
Applied to my drm-fixes

Thanks.

-- 
Ｍark Yao