linux-kernel - Re: [PATCH 3/3] drm/v3d: Fix prime imports of buffers from other drivers.

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Date:   Thu, 29 Nov 2018 17:37:56 +0000
From:   Dave Emett <david.emett@...adcom.com>
To:     Eric Anholt <eric@...olt.net>
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] drm/v3d: Fix prime imports of buffers from other drivers.

On Wed, 28 Nov 2018 at 23:09, Eric Anholt <eric@...olt.net> wrote:
>
> v3d_bo_get_pages() checks this to decide to map the imported buffer
> instead of the backing shmem file.  The caller was about to set this
> value anyway, and there's no error path in between.  Ideally we
> wouldn't even allocate the shmem file for our imports, but that's a
> more invasive fix.
>
> Signed-off-by: Eric Anholt <eric@...olt.net>
> Fixes: 57692c94dcbe ("drm/v3d: Introduce a new DRM driver for Broadcom V3D V3.x+")
> Cc: Dave Emett <david.emett@...adcom.com>

Reviewed-by: Dave Emett <david.emett@...adcom.com>
> ---
>
> I've been sitting on this one because I don't like it and was hoping
> the shmem library would pan out.  This is a useful patch for now,
> though.
>
>  drivers/gpu/drm/v3d/v3d_bo.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/gpu/drm/v3d/v3d_bo.c b/drivers/gpu/drm/v3d/v3d_bo.c
> index 54d96518a131..a08766d39eab 100644
> --- a/drivers/gpu/drm/v3d/v3d_bo.c
> +++ b/drivers/gpu/drm/v3d/v3d_bo.c
> @@ -293,6 +293,7 @@ v3d_prime_import_sg_table(struct drm_device *dev,
>         bo->resv = attach->dmabuf->resv;
>
>         bo->sgt = sgt;
> +       obj->import_attach = attach;
>         v3d_bo_get_pages(bo);
>
>         v3d_mmu_insert_ptes(bo);
> --
> 2.20.0.rc1
>