On Thu, Apr 15, 2021 at 12:17:34PM +0200, Thomas Zimmermann wrote:
> Drivers may want to set their own callbacks for a VM area. Only set
> TTM's callbacks if the vm_ops field is clear.
>
> Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx>
Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
> ---
> drivers/gpu/drm/ttm/ttm_bo_vm.c | 7 ++++++-
> 1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/ttm/ttm_bo_vm.c b/drivers/gpu/drm/ttm/ttm_bo_vm.c
> index b31b18058965..bf4a213bc66c 100644
> --- a/drivers/gpu/drm/ttm/ttm_bo_vm.c
> +++ b/drivers/gpu/drm/ttm/ttm_bo_vm.c
> @@ -534,7 +534,12 @@ static struct ttm_buffer_object *ttm_bo_vm_lookup(struct ttm_device *bdev,
>
> static void ttm_bo_mmap_vma_setup(struct ttm_buffer_object *bo, struct vm_area_struct *vma)
> {
> - vma->vm_ops = &ttm_bo_vm_ops;
> + /*
> + * Drivers may want to override the vm_ops field. Otherwise we
> + * use TTM's default callbacks.
> + */
> + if (!vma->vm_ops)
> + vma->vm_ops = &ttm_bo_vm_ops;
>
> /*
> * Note: We're transferring the bo reference to
> --
> 2.31.1
>
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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