mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-26 02:45:34 +07:00
c22ff7b4e7
When transmitting a packet via a mac802154 driver that can sleep in its transmit function, mac802154 defers the call to the driver's transmit function to a per-device workqueue. However, mac802154 uses a single global work_struct for this, which means that if you have more than one registered mac802154 interface in the system, and you transmit on more than one of them at the same time, you'll very easily cause memory corruption. This patch moves the deferred transmit processing state from global variables to struct ieee802154_local, and this seems to fix the memory corruption issue. Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org> Acked-by: Alexander Aring <alex.aring@gmail.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
253 lines
6.1 KiB
C
253 lines
6.1 KiB
C
/*
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* Copyright (C) 2007-2012 Siemens AG
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*
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* Written by:
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* Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
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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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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/netdevice.h>
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#include <net/netlink.h>
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#include <net/nl802154.h>
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#include <net/mac802154.h>
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#include <net/ieee802154_netdev.h>
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#include <net/route.h>
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#include <net/cfg802154.h>
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#include "ieee802154_i.h"
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#include "cfg.h"
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static void ieee802154_tasklet_handler(unsigned long data)
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{
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struct ieee802154_local *local = (struct ieee802154_local *)data;
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struct sk_buff *skb;
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while ((skb = skb_dequeue(&local->skb_queue))) {
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switch (skb->pkt_type) {
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case IEEE802154_RX_MSG:
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/* Clear skb->pkt_type in order to not confuse kernel
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* netstack.
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*/
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skb->pkt_type = 0;
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ieee802154_rx(local, skb);
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break;
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default:
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WARN(1, "mac802154: Packet is of unknown type %d\n",
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skb->pkt_type);
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kfree_skb(skb);
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break;
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}
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}
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}
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struct ieee802154_hw *
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ieee802154_alloc_hw(size_t priv_data_len, const struct ieee802154_ops *ops)
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{
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struct wpan_phy *phy;
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struct ieee802154_local *local;
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size_t priv_size;
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if (WARN_ON(!ops || !(ops->xmit_async || ops->xmit_sync) || !ops->ed ||
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!ops->start || !ops->stop || !ops->set_channel))
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return NULL;
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/* Ensure 32-byte alignment of our private data and hw private data.
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* We use the wpan_phy priv data for both our ieee802154_local and for
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* the driver's private data
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*
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* in memory it'll be like this:
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*
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* +-------------------------+
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* | struct wpan_phy |
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* +-------------------------+
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* | struct ieee802154_local |
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* +-------------------------+
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* | driver's private data |
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* +-------------------------+
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*
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* Due to ieee802154 layer isn't aware of driver and MAC structures,
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* so lets align them here.
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*/
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priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
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phy = wpan_phy_new(&mac802154_config_ops, priv_size);
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if (!phy) {
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pr_err("failure to allocate master IEEE802.15.4 device\n");
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return NULL;
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}
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phy->privid = mac802154_wpan_phy_privid;
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local = wpan_phy_priv(phy);
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local->phy = phy;
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local->hw.phy = local->phy;
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local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
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local->ops = ops;
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INIT_LIST_HEAD(&local->interfaces);
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mutex_init(&local->iflist_mtx);
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tasklet_init(&local->tasklet,
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ieee802154_tasklet_handler,
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(unsigned long)local);
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skb_queue_head_init(&local->skb_queue);
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INIT_WORK(&local->tx_work, ieee802154_xmit_worker);
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/* init supported flags with 802.15.4 default ranges */
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phy->supported.max_minbe = 8;
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phy->supported.min_maxbe = 3;
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phy->supported.max_maxbe = 8;
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phy->supported.min_frame_retries = -1;
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phy->supported.max_frame_retries = 7;
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phy->supported.max_csma_backoffs = 5;
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phy->supported.lbt = NL802154_SUPPORTED_BOOL_FALSE;
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/* always supported */
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phy->supported.iftypes = BIT(NL802154_IFTYPE_NODE);
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return &local->hw;
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}
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EXPORT_SYMBOL(ieee802154_alloc_hw);
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void ieee802154_free_hw(struct ieee802154_hw *hw)
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{
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struct ieee802154_local *local = hw_to_local(hw);
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BUG_ON(!list_empty(&local->interfaces));
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mutex_destroy(&local->iflist_mtx);
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wpan_phy_free(local->phy);
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}
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EXPORT_SYMBOL(ieee802154_free_hw);
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static void ieee802154_setup_wpan_phy_pib(struct wpan_phy *wpan_phy)
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{
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/* TODO warn on empty symbol_duration
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* Should be done when all drivers sets this value.
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*/
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wpan_phy->lifs_period = IEEE802154_LIFS_PERIOD *
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wpan_phy->symbol_duration;
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wpan_phy->sifs_period = IEEE802154_SIFS_PERIOD *
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wpan_phy->symbol_duration;
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}
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int ieee802154_register_hw(struct ieee802154_hw *hw)
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{
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struct ieee802154_local *local = hw_to_local(hw);
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struct net_device *dev;
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int rc = -ENOSYS;
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local->workqueue =
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create_singlethread_workqueue(wpan_phy_name(local->phy));
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if (!local->workqueue) {
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rc = -ENOMEM;
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goto out;
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}
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hrtimer_init(&local->ifs_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
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local->ifs_timer.function = ieee802154_xmit_ifs_timer;
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wpan_phy_set_dev(local->phy, local->hw.parent);
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ieee802154_setup_wpan_phy_pib(local->phy);
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if (!(hw->flags & IEEE802154_HW_CSMA_PARAMS)) {
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local->phy->supported.min_csma_backoffs = 4;
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local->phy->supported.max_csma_backoffs = 4;
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local->phy->supported.min_maxbe = 5;
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local->phy->supported.max_maxbe = 5;
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local->phy->supported.min_minbe = 3;
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local->phy->supported.max_minbe = 3;
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}
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if (!(hw->flags & IEEE802154_HW_FRAME_RETRIES)) {
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/* TODO should be 3, but our default value is -1 which means
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* no ARET handling.
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*/
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local->phy->supported.min_frame_retries = -1;
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local->phy->supported.max_frame_retries = -1;
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}
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if (hw->flags & IEEE802154_HW_PROMISCUOUS)
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local->phy->supported.iftypes |= BIT(NL802154_IFTYPE_MONITOR);
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rc = wpan_phy_register(local->phy);
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if (rc < 0)
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goto out_wq;
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rtnl_lock();
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dev = ieee802154_if_add(local, "wpan%d", NET_NAME_ENUM,
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NL802154_IFTYPE_NODE,
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cpu_to_le64(0x0000000000000000ULL));
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if (IS_ERR(dev)) {
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rtnl_unlock();
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rc = PTR_ERR(dev);
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goto out_phy;
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}
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rtnl_unlock();
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return 0;
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out_phy:
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wpan_phy_unregister(local->phy);
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out_wq:
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destroy_workqueue(local->workqueue);
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out:
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return rc;
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}
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EXPORT_SYMBOL(ieee802154_register_hw);
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void ieee802154_unregister_hw(struct ieee802154_hw *hw)
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{
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struct ieee802154_local *local = hw_to_local(hw);
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tasklet_kill(&local->tasklet);
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flush_workqueue(local->workqueue);
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destroy_workqueue(local->workqueue);
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rtnl_lock();
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ieee802154_remove_interfaces(local);
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rtnl_unlock();
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wpan_phy_unregister(local->phy);
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}
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EXPORT_SYMBOL(ieee802154_unregister_hw);
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static int __init ieee802154_init(void)
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{
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return ieee802154_iface_init();
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}
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static void __exit ieee802154_exit(void)
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{
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ieee802154_iface_exit();
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rcu_barrier();
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}
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subsys_initcall(ieee802154_init);
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module_exit(ieee802154_exit);
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MODULE_DESCRIPTION("IEEE 802.15.4 subsystem");
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MODULE_LICENSE("GPL v2");
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