linux-kernel - Re: [PATCH v5 01/17] drm/panfrost: Put mapping instead of shmem obj on panfrost_mmu_map_fault

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Date:   Thu, 28 Apr 2022 14:19:00 +0100
From:   Steven Price <steven.price@....com>
To:     Dmitry Osipenko <dmitry.osipenko@...labora.com>,
        David Airlie <airlied@...ux.ie>,
        Gerd Hoffmann <kraxel@...hat.com>,
        Gurchetan Singh <gurchetansingh@...omium.org>,
        Chia-I Wu <olvaffe@...il.com>, Daniel Vetter <daniel@...ll.ch>,
        Daniel Almeida <daniel.almeida@...labora.com>,
        Gert Wollny <gert.wollny@...labora.com>,
        Gustavo Padovan <gustavo.padovan@...labora.com>,
        Daniel Stone <daniel@...ishbar.org>,
        Tomeu Vizoso <tomeu.vizoso@...labora.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Rob Herring <robh@...nel.org>,
        Alyssa Rosenzweig <alyssa.rosenzweig@...labora.com>,
        Rob Clark <robdclark@...il.com>,
        Emil Velikov <emil.l.velikov@...il.com>,
        Robin Murphy <robin.murphy@....com>,
        Qiang Yu <yuq825@...il.com>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Christian König <christian.koenig@....com>
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org,
        Dmitry Osipenko <digetx@...il.com>
Subject: Re: [PATCH v5 01/17] drm/panfrost: Put mapping instead of shmem obj
 on panfrost_mmu_map_fault_addr() error

On 24/04/2022 20:04, Dmitry Osipenko wrote:
> When panfrost_mmu_map_fault_addr() fails, the BO's mapping should be
> unreferenced and not the shmem object that backs that mapping.
> 
> Cc: stable@...r.kernel.org
> Signed-off-by: Dmitry Osipenko <dmitry.osipenko@...labora.com>

Fixes: bdefca2d8dc0 ("drm/panfrost: Add the panfrost_gem_mapping concept")

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

Thanks,

Steve

> ---
>  drivers/gpu/drm/panfrost/panfrost_mmu.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/panfrost/panfrost_mmu.c b/drivers/gpu/drm/panfrost/panfrost_mmu.c
> index d3f82b26a631..b285a8001b1d 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_mmu.c
> +++ b/drivers/gpu/drm/panfrost/panfrost_mmu.c
> @@ -518,7 +518,7 @@ static int panfrost_mmu_map_fault_addr(struct panfrost_device *pfdev, int as,
>  err_pages:
>  	drm_gem_shmem_put_pages(&bo->base);
>  err_bo:
> -	drm_gem_object_put(&bo->base.base);
> +	panfrost_gem_mapping_put(bomapping);
>  	return ret;
>  }
>