[PATCH] drm/amdgpu: fix VM leaf walking

[Kuehling, Felix]

On 2018-10-25 10:38 a.m., Christian König wrote:
> Make sure we don't try to go down further after the leave walk already
> ended. This fixes a crash with a new VM test.
>
> Signed-off-by: Christian König <christian.koenig at amd.com>

Reviewed-by: Felix Kuehling <Felix.Kuehling at amd.com>

Regards,
  Felix

> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> index db0cbf8d219d..352b30409060 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> @@ -542,7 +542,8 @@ static void amdgpu_vm_pt_next_leaf(struct amdgpu_device *adev,
>  				   struct amdgpu_vm_pt_cursor *cursor)
>  {
>  	amdgpu_vm_pt_next(adev, cursor);
> -	while (amdgpu_vm_pt_descendant(adev, cursor));
> +	if (cursor->pfn != ~0ll)
> +		while (amdgpu_vm_pt_descendant(adev, cursor));
>  }
>  
>  /**