drm/radeon: finally fix the racy VMA setup

	man->size = size >> PAGE_SHIFT;

}

static struct vm_operations_struct radeon_ttm_vm_ops;

static const struct vm_operations_struct *ttm_vm_ops = NULL;

static vm_fault_t radeon_ttm_fault(struct vm_fault *vmf)

{

	struct ttm_buffer_object *bo;

	vm_fault_t ret;

	bo = (struct ttm_buffer_object *)vmf->vma->vm_private_data;

	if (bo == NULL) {

	if (bo == NULL)

		return VM_FAULT_NOPAGE;

	}

	rdev = radeon_get_rdev(bo->bdev);

	down_read(&rdev->pm.mclk_lock);

	ret = ttm_vm_ops->fault(vmf);

	ret = ttm_bo_vm_fault(vmf);

	up_read(&rdev->pm.mclk_lock);

	return ret;

}

static struct vm_operations_struct radeon_ttm_vm_ops = {

	.fault = radeon_ttm_fault,

	.open = ttm_bo_vm_open,

	.close = ttm_bo_vm_close,

	.access = ttm_bo_vm_access

};

int radeon_mmap(struct file *filp, struct vm_area_struct *vma)

{

	int r;

	struct drm_file *file_priv = filp->private_data;

	struct radeon_device *rdev = file_priv->minor->dev->dev_private;

	if (rdev == NULL) {

	if (rdev == NULL)

		return -EINVAL;

	}

	r = ttm_bo_mmap(filp, vma, &rdev->mman.bdev);

	if (unlikely(r != 0)) {

	if (unlikely(r != 0))

		return r;

	}

	if (unlikely(ttm_vm_ops == NULL)) {

		ttm_vm_ops = vma->vm_ops;

		radeon_ttm_vm_ops = *ttm_vm_ops;

		radeon_ttm_vm_ops.fault = &radeon_ttm_fault;

	}

	vma->vm_ops = &radeon_ttm_vm_ops;

	return 0;

}