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

[Daniel Vetter]

On Wed, Nov 28, 2018 at 03:09:27PM -0800, Eric Anholt 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@xxxxxxxxxx>
> Fixes: 57692c94dcbe ("drm/v3d: Introduce a new DRM driver for Broadcom V3D V3.x+")
> Cc: Dave Emett <david.emett@xxxxxxxxxxxx>

Acked-by: Daniel Vetter <daniel.vetter@xxxxxxxx>

> ---
> 
> 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
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch