linux-kernel - Re: [PATCH v2] drm/panfrost: Use kvfree() to free bo->sgts

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Date:   Thu, 11 Jun 2020 10:31:13 +0100
From:   Steven Price <steven.price@....com>
To:     Denis Efremov <efremov@...ux.com>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>
Cc:     linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        Tomeu Vizoso <tomeu.vizoso@...labora.com>,
        Rob Herring <robh@...nel.org>, stable@...r.kernel.org
Subject: Re: [PATCH v2] drm/panfrost: Use kvfree() to free bo->sgts

On 08/06/2020 16:17, Denis Efremov wrote:
> Use kvfree() to free bo->sgts, because the memory is allocated with
> kvmalloc_array() in panfrost_mmu_map_fault_addr().
> 
> Fixes: 187d2929206e ("drm/panfrost: Add support for GPU heap allocations")
> Cc: stable@...r.kernel.org
> Signed-off-by: Denis Efremov <efremov@...ux.com>

Reviewed-by: Steven Price <steven.price@....com>

Thanks,

Steve

> ---
> Change in v2:
>   - kvfree() fixed in panfrost_gem_free_object(), thanks to Steven Price
> 
>   drivers/gpu/drm/panfrost/panfrost_gem.c | 2 +-
>   drivers/gpu/drm/panfrost/panfrost_mmu.c | 2 +-
>   2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/panfrost/panfrost_gem.c b/drivers/gpu/drm/panfrost/panfrost_gem.c
> index 17b654e1eb94..556181ea4a07 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_gem.c
> +++ b/drivers/gpu/drm/panfrost/panfrost_gem.c
> @@ -46,7 +46,7 @@ static void panfrost_gem_free_object(struct drm_gem_object *obj)
>   				sg_free_table(&bo->sgts[i]);
>   			}
>   		}
> -		kfree(bo->sgts);
> +		kvfree(bo->sgts);
>   	}
>   
>   	drm_gem_shmem_free_object(obj);
> diff --git a/drivers/gpu/drm/panfrost/panfrost_mmu.c b/drivers/gpu/drm/panfrost/panfrost_mmu.c
> index ed28aeba6d59..3c8ae7411c80 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_mmu.c
> +++ b/drivers/gpu/drm/panfrost/panfrost_mmu.c
> @@ -486,7 +486,7 @@ static int panfrost_mmu_map_fault_addr(struct panfrost_device *pfdev, int as,
>   		pages = kvmalloc_array(bo->base.base.size >> PAGE_SHIFT,
>   				       sizeof(struct page *), GFP_KERNEL | __GFP_ZERO);
>   		if (!pages) {
> -			kfree(bo->sgts);
> +			kvfree(bo->sgts);
>   			bo->sgts = NULL;
>   			mutex_unlock(&bo->base.pages_lock);
>   			ret = -ENOMEM;
>