blob: c0023ac1b7551e6bdba6de775b7defafc5ce1292 [file] [log] [blame]
* Copyright (c) 2014 Hauke Mehrtens <>
* Copyright (c) 2015 Luis R. Rodriguez <>
* Backport functionality introduced in Linux 3.15.
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
#include <linux/version.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/of.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <net/net_namespace.h>
* devm_kstrdup - Allocate resource managed space and
* copy an existing string into that.
* @dev: Device to allocate memory for
* @s: the string to duplicate
* @gfp: the GFP mask used in the devm_kmalloc() call when
* allocating memory
* Pointer to allocated string on success, NULL on failure.
char *devm_kstrdup(struct device *dev, const char *s, gfp_t gfp)
size_t size;
char *buf;
if (!s)
return NULL;
size = strlen(s) + 1;
buf = devm_kmalloc(dev, size, gfp);
if (buf)
memcpy(buf, s, size);
return buf;
#ifdef CONFIG_OF
* of_property_count_elems_of_size - Count the number of elements in a property
* @np: device node from which the property value is to be read.
* @propname: name of the property to be searched.
* @elem_size: size of the individual element
* Search for a property in a device node and count the number of elements of
* size elem_size in it. Returns number of elements on sucess, -EINVAL if the
* property does not exist or its length does not match a multiple of elem_size
* and -ENODATA if the property does not have a value.
int of_property_count_elems_of_size(const struct device_node *np,
const char *propname, int elem_size)
struct property *prop = of_find_property(np, propname, NULL);
if (!prop)
return -EINVAL;
if (!prop->value)
return -ENODATA;
if (prop->length % elem_size != 0) {
pr_err("size of %s in node %s is not a multiple of %d\n",
propname, np->full_name, elem_size);
return -EINVAL;
return prop->length / elem_size;
void kvfree(const void *addr)
if (is_vmalloc_addr(addr))