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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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a6c0f8217c
Check for NULL pointer after kzalloc Signed-off-by: Denis Kirjanov <dkirjanov@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
227 lines
5.1 KiB
C
227 lines
5.1 KiB
C
/*
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* Copyright (C) 2007, 2008, 2009 Siemens AG
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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
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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#include <linux/slab.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/device.h>
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#include <net/wpan-phy.h>
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#include "ieee802154.h"
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#define MASTER_SHOW_COMPLEX(name, format_string, args...) \
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static ssize_t name ## _show(struct device *dev, \
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struct device_attribute *attr, char *buf) \
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{ \
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struct wpan_phy *phy = container_of(dev, struct wpan_phy, dev); \
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int ret; \
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\
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mutex_lock(&phy->pib_lock); \
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ret = snprintf(buf, PAGE_SIZE, format_string "\n", args); \
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mutex_unlock(&phy->pib_lock); \
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return ret; \
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}
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#define MASTER_SHOW(field, format_string) \
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MASTER_SHOW_COMPLEX(field, format_string, phy->field)
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MASTER_SHOW(current_channel, "%d");
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MASTER_SHOW(current_page, "%d");
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MASTER_SHOW_COMPLEX(transmit_power, "%d +- %d dB",
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((signed char) (phy->transmit_power << 2)) >> 2,
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(phy->transmit_power >> 6) ? (phy->transmit_power >> 6) * 3 : 1 );
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MASTER_SHOW(cca_mode, "%d");
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static ssize_t channels_supported_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct wpan_phy *phy = container_of(dev, struct wpan_phy, dev);
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int ret;
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int i, len = 0;
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mutex_lock(&phy->pib_lock);
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for (i = 0; i < 32; i++) {
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ret = snprintf(buf + len, PAGE_SIZE - len,
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"%#09x\n", phy->channels_supported[i]);
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if (ret < 0)
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break;
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len += ret;
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}
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mutex_unlock(&phy->pib_lock);
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return len;
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}
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static struct device_attribute pmib_attrs[] = {
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__ATTR_RO(current_channel),
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__ATTR_RO(current_page),
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__ATTR_RO(channels_supported),
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__ATTR_RO(transmit_power),
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__ATTR_RO(cca_mode),
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{},
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};
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static void wpan_phy_release(struct device *d)
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{
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struct wpan_phy *phy = container_of(d, struct wpan_phy, dev);
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kfree(phy);
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}
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static struct class wpan_phy_class = {
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.name = "ieee802154",
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.dev_release = wpan_phy_release,
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.dev_attrs = pmib_attrs,
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};
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static DEFINE_MUTEX(wpan_phy_mutex);
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static int wpan_phy_idx;
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static int wpan_phy_match(struct device *dev, void *data)
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{
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return !strcmp(dev_name(dev), (const char *)data);
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}
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struct wpan_phy *wpan_phy_find(const char *str)
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{
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struct device *dev;
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if (WARN_ON(!str))
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return NULL;
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dev = class_find_device(&wpan_phy_class, NULL,
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(void *)str, wpan_phy_match);
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if (!dev)
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return NULL;
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return container_of(dev, struct wpan_phy, dev);
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}
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EXPORT_SYMBOL(wpan_phy_find);
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struct wpan_phy_iter_data {
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int (*fn)(struct wpan_phy *phy, void *data);
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void *data;
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};
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static int wpan_phy_iter(struct device *dev, void *_data)
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{
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struct wpan_phy_iter_data *wpid = _data;
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struct wpan_phy *phy = container_of(dev, struct wpan_phy, dev);
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return wpid->fn(phy, wpid->data);
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}
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int wpan_phy_for_each(int (*fn)(struct wpan_phy *phy, void *data),
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void *data)
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{
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struct wpan_phy_iter_data wpid = {
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.fn = fn,
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.data = data,
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};
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return class_for_each_device(&wpan_phy_class, NULL,
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&wpid, wpan_phy_iter);
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}
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EXPORT_SYMBOL(wpan_phy_for_each);
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static int wpan_phy_idx_valid(int idx)
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{
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return idx >= 0;
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}
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struct wpan_phy *wpan_phy_alloc(size_t priv_size)
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{
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struct wpan_phy *phy = kzalloc(sizeof(*phy) + priv_size,
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GFP_KERNEL);
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if (!phy)
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goto out;
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mutex_lock(&wpan_phy_mutex);
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phy->idx = wpan_phy_idx++;
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if (unlikely(!wpan_phy_idx_valid(phy->idx))) {
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wpan_phy_idx--;
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mutex_unlock(&wpan_phy_mutex);
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kfree(phy);
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goto out;
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}
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mutex_unlock(&wpan_phy_mutex);
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mutex_init(&phy->pib_lock);
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device_initialize(&phy->dev);
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dev_set_name(&phy->dev, "wpan-phy%d", phy->idx);
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phy->dev.class = &wpan_phy_class;
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phy->current_channel = -1; /* not initialised */
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phy->current_page = 0; /* for compatibility */
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return phy;
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out:
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return NULL;
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}
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EXPORT_SYMBOL(wpan_phy_alloc);
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int wpan_phy_register(struct wpan_phy *phy)
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{
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return device_add(&phy->dev);
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}
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EXPORT_SYMBOL(wpan_phy_register);
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void wpan_phy_unregister(struct wpan_phy *phy)
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{
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device_del(&phy->dev);
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}
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EXPORT_SYMBOL(wpan_phy_unregister);
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void wpan_phy_free(struct wpan_phy *phy)
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{
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put_device(&phy->dev);
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}
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EXPORT_SYMBOL(wpan_phy_free);
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static int __init wpan_phy_class_init(void)
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{
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int rc;
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rc = class_register(&wpan_phy_class);
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if (rc)
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goto err;
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rc = ieee802154_nl_init();
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if (rc)
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goto err_nl;
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return 0;
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err_nl:
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class_unregister(&wpan_phy_class);
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err:
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return rc;
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}
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subsys_initcall(wpan_phy_class_init);
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static void __exit wpan_phy_class_exit(void)
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{
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ieee802154_nl_exit();
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class_unregister(&wpan_phy_class);
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}
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module_exit(wpan_phy_class_exit);
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("IEEE 802.15.4 configuration interface");
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MODULE_AUTHOR("Dmitry Eremin-Solenikov");
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