[PATCH 05/10] drm/gem-shmem: Use dma_buf from GEM object instance

[Anusha Srivatsa]

Reviewed-by: Anusha Srivatsa <asrivats at redhat.com>


On Wed, Feb 26, 2025 at 12:28 PM Thomas Zimmermann <tzimmermann at suse.de>
wrote:

> Avoid dereferencing struct drm_gem_object.import_attach for the
> imported dma-buf. The dma_buf field in the GEM object instance refers
> to the same buffer. Prepares to make import_attach optional.
>
> Signed-off-by: Thomas Zimmermann <tzimmermann at suse.de>
> ---
>  drivers/gpu/drm/drm_gem_shmem_helper.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_gem_shmem_helper.c
> b/drivers/gpu/drm/drm_gem_shmem_helper.c
> index 7722cd720248..d99dee67353a 100644
> --- a/drivers/gpu/drm/drm_gem_shmem_helper.c
> +++ b/drivers/gpu/drm/drm_gem_shmem_helper.c
> @@ -339,10 +339,10 @@ int drm_gem_shmem_vmap(struct drm_gem_shmem_object
> *shmem,
>         int ret = 0;
>
>         if (drm_gem_is_imported(obj)) {
> -               ret = dma_buf_vmap(obj->import_attach->dmabuf, map);
> +               ret = dma_buf_vmap(obj->dma_buf, map);
>                 if (!ret) {
>                         if (drm_WARN_ON(obj->dev, map->is_iomem)) {
> -                               dma_buf_vunmap(obj->import_attach->dmabuf,
> map);
> +                               dma_buf_vunmap(obj->dma_buf, map);
>                                 return -EIO;
>                         }
>                 }
> @@ -405,7 +405,7 @@ void drm_gem_shmem_vunmap(struct drm_gem_shmem_object
> *shmem,
>         struct drm_gem_object *obj = &shmem->base;
>
>         if (drm_gem_is_imported(obj)) {
> -               dma_buf_vunmap(obj->import_attach->dmabuf, map);
> +               dma_buf_vunmap(obj->dma_buf, map);
>         } else {
>                 dma_resv_assert_held(shmem->base.resv);
>
> --
> 2.48.1
>
>
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