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