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f0feb34904
Right now we are able to stop a queue but we have no indication if a transmission is ongoing or not. Thanks to recent additions, we can track the number of ongoing transmissions so we know if the last transmission is over. Adding on top of it an internal wait queue also allows to be woken up asynchronously when this happens. If, beforehands, we marked the queue to be held and stopped it, we end up flushing and stopping the tx queue. Thanks to this feature, we will soon be able to introduce a synchronous transmit API. Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com> Acked-by: Alexander Aring <aahringo@redhat.com> Link: https://lore.kernel.org/r/20220519150516.443078-9-miquel.raynal@bootlin.com Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
392 lines
8.4 KiB
C
392 lines
8.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2007, 2008, 2009 Siemens AG
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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/cfg802154.h>
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#include <net/rtnetlink.h>
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#include "ieee802154.h"
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#include "nl802154.h"
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#include "sysfs.h"
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#include "core.h"
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/* name for sysfs, %d is appended */
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#define PHY_NAME "phy"
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/* RCU-protected (and RTNL for writers) */
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LIST_HEAD(cfg802154_rdev_list);
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int cfg802154_rdev_list_generation;
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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_by_name(&wpan_phy_class, str);
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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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struct cfg802154_registered_device *
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cfg802154_rdev_by_wpan_phy_idx(int wpan_phy_idx)
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{
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struct cfg802154_registered_device *result = NULL, *rdev;
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ASSERT_RTNL();
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list_for_each_entry(rdev, &cfg802154_rdev_list, list) {
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if (rdev->wpan_phy_idx == wpan_phy_idx) {
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result = rdev;
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break;
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}
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}
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return result;
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}
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struct wpan_phy *wpan_phy_idx_to_wpan_phy(int wpan_phy_idx)
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{
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struct cfg802154_registered_device *rdev;
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ASSERT_RTNL();
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rdev = cfg802154_rdev_by_wpan_phy_idx(wpan_phy_idx);
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if (!rdev)
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return NULL;
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return &rdev->wpan_phy;
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}
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struct wpan_phy *
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wpan_phy_new(const struct cfg802154_ops *ops, size_t priv_size)
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{
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static atomic_t wpan_phy_counter = ATOMIC_INIT(0);
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struct cfg802154_registered_device *rdev;
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size_t alloc_size;
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alloc_size = sizeof(*rdev) + priv_size;
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rdev = kzalloc(alloc_size, GFP_KERNEL);
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if (!rdev)
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return NULL;
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rdev->ops = ops;
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rdev->wpan_phy_idx = atomic_inc_return(&wpan_phy_counter);
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if (unlikely(rdev->wpan_phy_idx < 0)) {
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/* ugh, wrapped! */
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atomic_dec(&wpan_phy_counter);
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kfree(rdev);
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return NULL;
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}
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/* atomic_inc_return makes it start at 1, make it start at 0 */
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rdev->wpan_phy_idx--;
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INIT_LIST_HEAD(&rdev->wpan_dev_list);
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device_initialize(&rdev->wpan_phy.dev);
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dev_set_name(&rdev->wpan_phy.dev, PHY_NAME "%d", rdev->wpan_phy_idx);
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rdev->wpan_phy.dev.class = &wpan_phy_class;
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rdev->wpan_phy.dev.platform_data = rdev;
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wpan_phy_net_set(&rdev->wpan_phy, &init_net);
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init_waitqueue_head(&rdev->dev_wait);
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init_waitqueue_head(&rdev->wpan_phy.sync_txq);
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spin_lock_init(&rdev->wpan_phy.queue_lock);
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return &rdev->wpan_phy;
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}
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EXPORT_SYMBOL(wpan_phy_new);
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int wpan_phy_register(struct wpan_phy *phy)
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{
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struct cfg802154_registered_device *rdev = wpan_phy_to_rdev(phy);
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int ret;
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rtnl_lock();
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ret = device_add(&phy->dev);
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if (ret) {
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rtnl_unlock();
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return ret;
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}
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list_add_rcu(&rdev->list, &cfg802154_rdev_list);
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cfg802154_rdev_list_generation++;
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/* TODO phy registered lock */
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rtnl_unlock();
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/* TODO nl802154 phy notify */
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return 0;
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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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struct cfg802154_registered_device *rdev = wpan_phy_to_rdev(phy);
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wait_event(rdev->dev_wait, ({
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int __count;
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rtnl_lock();
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__count = rdev->opencount;
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rtnl_unlock();
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__count == 0; }));
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rtnl_lock();
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/* TODO nl802154 phy notify */
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/* TODO phy registered lock */
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WARN_ON(!list_empty(&rdev->wpan_dev_list));
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/* First remove the hardware from everywhere, this makes
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* it impossible to find from userspace.
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*/
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list_del_rcu(&rdev->list);
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synchronize_rcu();
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cfg802154_rdev_list_generation++;
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device_del(&phy->dev);
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rtnl_unlock();
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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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int cfg802154_switch_netns(struct cfg802154_registered_device *rdev,
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struct net *net)
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{
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struct wpan_dev *wpan_dev;
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int err = 0;
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list_for_each_entry(wpan_dev, &rdev->wpan_dev_list, list) {
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if (!wpan_dev->netdev)
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continue;
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wpan_dev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
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err = dev_change_net_namespace(wpan_dev->netdev, net, "wpan%d");
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if (err)
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break;
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wpan_dev->netdev->features |= NETIF_F_NETNS_LOCAL;
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}
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if (err) {
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/* failed -- clean up to old netns */
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net = wpan_phy_net(&rdev->wpan_phy);
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list_for_each_entry_continue_reverse(wpan_dev,
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&rdev->wpan_dev_list,
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list) {
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if (!wpan_dev->netdev)
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continue;
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wpan_dev->netdev->features &= ~NETIF_F_NETNS_LOCAL;
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err = dev_change_net_namespace(wpan_dev->netdev, net,
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"wpan%d");
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WARN_ON(err);
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wpan_dev->netdev->features |= NETIF_F_NETNS_LOCAL;
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}
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return err;
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}
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wpan_phy_net_set(&rdev->wpan_phy, net);
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err = device_rename(&rdev->wpan_phy.dev, dev_name(&rdev->wpan_phy.dev));
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WARN_ON(err);
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return 0;
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}
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void cfg802154_dev_free(struct cfg802154_registered_device *rdev)
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{
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kfree(rdev);
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}
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static void
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cfg802154_update_iface_num(struct cfg802154_registered_device *rdev,
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int iftype, int num)
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{
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ASSERT_RTNL();
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rdev->num_running_ifaces += num;
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}
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static int cfg802154_netdev_notifier_call(struct notifier_block *nb,
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unsigned long state, void *ptr)
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{
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struct net_device *dev = netdev_notifier_info_to_dev(ptr);
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struct wpan_dev *wpan_dev = dev->ieee802154_ptr;
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struct cfg802154_registered_device *rdev;
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if (!wpan_dev)
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return NOTIFY_DONE;
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rdev = wpan_phy_to_rdev(wpan_dev->wpan_phy);
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/* TODO WARN_ON unspec type */
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switch (state) {
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/* TODO NETDEV_DEVTYPE */
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case NETDEV_REGISTER:
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dev->features |= NETIF_F_NETNS_LOCAL;
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wpan_dev->identifier = ++rdev->wpan_dev_id;
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list_add_rcu(&wpan_dev->list, &rdev->wpan_dev_list);
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rdev->devlist_generation++;
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wpan_dev->netdev = dev;
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break;
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case NETDEV_DOWN:
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cfg802154_update_iface_num(rdev, wpan_dev->iftype, -1);
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rdev->opencount--;
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wake_up(&rdev->dev_wait);
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break;
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case NETDEV_UP:
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cfg802154_update_iface_num(rdev, wpan_dev->iftype, 1);
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rdev->opencount++;
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break;
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case NETDEV_UNREGISTER:
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/* It is possible to get NETDEV_UNREGISTER
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* multiple times. To detect that, check
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* that the interface is still on the list
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* of registered interfaces, and only then
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* remove and clean it up.
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*/
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if (!list_empty(&wpan_dev->list)) {
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list_del_rcu(&wpan_dev->list);
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rdev->devlist_generation++;
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}
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/* synchronize (so that we won't find this netdev
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* from other code any more) and then clear the list
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* head so that the above code can safely check for
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* !list_empty() to avoid double-cleanup.
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*/
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synchronize_rcu();
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INIT_LIST_HEAD(&wpan_dev->list);
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break;
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default:
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return NOTIFY_DONE;
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}
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return NOTIFY_OK;
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}
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static struct notifier_block cfg802154_netdev_notifier = {
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.notifier_call = cfg802154_netdev_notifier_call,
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};
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static void __net_exit cfg802154_pernet_exit(struct net *net)
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{
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struct cfg802154_registered_device *rdev;
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rtnl_lock();
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list_for_each_entry(rdev, &cfg802154_rdev_list, list) {
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if (net_eq(wpan_phy_net(&rdev->wpan_phy), net))
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WARN_ON(cfg802154_switch_netns(rdev, &init_net));
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}
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rtnl_unlock();
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}
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static struct pernet_operations cfg802154_pernet_ops = {
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.exit = cfg802154_pernet_exit,
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};
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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 = register_pernet_device(&cfg802154_pernet_ops);
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if (rc)
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goto err;
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rc = wpan_phy_sysfs_init();
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if (rc)
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goto err_sysfs;
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rc = register_netdevice_notifier(&cfg802154_netdev_notifier);
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if (rc)
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goto err_nl;
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rc = ieee802154_nl_init();
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if (rc)
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goto err_notifier;
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rc = nl802154_init();
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if (rc)
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goto err_ieee802154_nl;
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return 0;
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err_ieee802154_nl:
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ieee802154_nl_exit();
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err_notifier:
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unregister_netdevice_notifier(&cfg802154_netdev_notifier);
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err_nl:
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wpan_phy_sysfs_exit();
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err_sysfs:
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unregister_pernet_device(&cfg802154_pernet_ops);
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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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nl802154_exit();
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ieee802154_nl_exit();
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unregister_netdevice_notifier(&cfg802154_netdev_notifier);
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wpan_phy_sysfs_exit();
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unregister_pernet_device(&cfg802154_pernet_ops);
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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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