powerpc/pseries: re-use code from of_helpers module

#include <linux/cpu.h>

#include <linux/slab.h>

#include <linux/of.h>

#include "of_helpers.h"

#include "offline_states.h"

#include "pseries.h"

	return first_dn;

}

static struct device_node *derive_parent(const char *path)

{

	struct device_node *parent;

	char *last_slash;

	last_slash = strrchr(path, '/');

	if (last_slash == path) {

		parent = of_find_node_by_path("/");

	} else {

		char *parent_path;

		int parent_path_len = last_slash - path + 1;

		parent_path = kmalloc(parent_path_len, GFP_KERNEL);

		if (!parent_path)

			return NULL;

		strlcpy(parent_path, path, parent_path_len);

		parent = of_find_node_by_path(parent_path);

		kfree(parent_path);

	}

	return parent;

}

int dlpar_attach_node(struct device_node *dn)

{

	int rc;

	dn->parent = derive_parent(dn->full_name);

	if (!dn->parent)

		return -ENOMEM;

	dn->parent = pseries_of_derive_parent(dn->full_name);

	if (IS_ERR(dn->parent))

		return PTR_ERR(dn->parent);

	rc = of_attach_node(dn);

	if (rc) {