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![Konstantin Khlebnikov](/assets/img/avatar_default.png)
mutex_destroy() must be called before wpan_phy_free(), because it puts the last reference and frees memory. Catched as overwritten poison in kmalloc-2048. Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org> Cc: Alexander Smirnov <alex.bluesman.smirnov@gmail.com> Cc: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com> Cc: David S. Miller <davem@davemloft.net> Cc: linux-zigbee-devel@lists.sourceforge.net Cc: netdev@vger.kernel.org Signed-off-by: David S. Miller <davem@davemloft.net>
298 lines
6.6 KiB
C
298 lines
6.6 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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* Based on the code from 'linux-zigbee.sourceforge.net' project.
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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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#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 <linux/nl802154.h>
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#include <net/mac802154.h>
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#include <net/route.h>
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#include <net/wpan-phy.h>
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#include "mac802154.h"
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int mac802154_slave_open(struct net_device *dev)
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{
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struct mac802154_sub_if_data *priv = netdev_priv(dev);
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struct mac802154_priv *ipriv = priv->hw;
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int res = 0;
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if (ipriv->open_count++ == 0) {
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res = ipriv->ops->start(&ipriv->hw);
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WARN_ON(res);
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if (res)
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goto err;
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}
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if (ipriv->ops->ieee_addr) {
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res = ipriv->ops->ieee_addr(&ipriv->hw, dev->dev_addr);
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WARN_ON(res);
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if (res)
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goto err;
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mac802154_dev_set_ieee_addr(dev);
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}
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netif_start_queue(dev);
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return 0;
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err:
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priv->hw->open_count--;
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return res;
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}
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int mac802154_slave_close(struct net_device *dev)
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{
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struct mac802154_sub_if_data *priv = netdev_priv(dev);
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struct mac802154_priv *ipriv = priv->hw;
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netif_stop_queue(dev);
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if (!--ipriv->open_count)
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ipriv->ops->stop(&ipriv->hw);
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return 0;
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}
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static int
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mac802154_netdev_register(struct wpan_phy *phy, struct net_device *dev)
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{
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struct mac802154_sub_if_data *priv;
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struct mac802154_priv *ipriv;
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int err;
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ipriv = wpan_phy_priv(phy);
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priv = netdev_priv(dev);
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priv->dev = dev;
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priv->hw = ipriv;
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dev->needed_headroom = ipriv->hw.extra_tx_headroom;
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SET_NETDEV_DEV(dev, &ipriv->phy->dev);
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mutex_lock(&ipriv->slaves_mtx);
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if (!ipriv->running) {
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mutex_unlock(&ipriv->slaves_mtx);
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return -ENODEV;
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}
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mutex_unlock(&ipriv->slaves_mtx);
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err = register_netdev(dev);
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if (err < 0)
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return err;
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rtnl_lock();
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mutex_lock(&ipriv->slaves_mtx);
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list_add_tail_rcu(&priv->list, &ipriv->slaves);
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mutex_unlock(&ipriv->slaves_mtx);
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rtnl_unlock();
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return 0;
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}
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static void
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mac802154_del_iface(struct wpan_phy *phy, struct net_device *dev)
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{
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struct mac802154_sub_if_data *sdata;
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ASSERT_RTNL();
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sdata = netdev_priv(dev);
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BUG_ON(sdata->hw->phy != phy);
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mutex_lock(&sdata->hw->slaves_mtx);
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list_del_rcu(&sdata->list);
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mutex_unlock(&sdata->hw->slaves_mtx);
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synchronize_rcu();
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unregister_netdevice(sdata->dev);
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}
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static struct net_device *
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mac802154_add_iface(struct wpan_phy *phy, const char *name, int type)
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{
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struct net_device *dev;
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int err = -ENOMEM;
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switch (type) {
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case IEEE802154_DEV_MONITOR:
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dev = alloc_netdev(sizeof(struct mac802154_sub_if_data),
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name, mac802154_monitor_setup);
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break;
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case IEEE802154_DEV_WPAN:
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dev = alloc_netdev(sizeof(struct mac802154_sub_if_data),
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name, mac802154_wpan_setup);
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break;
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default:
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dev = NULL;
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err = -EINVAL;
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break;
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}
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if (!dev)
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goto err;
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err = mac802154_netdev_register(phy, dev);
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if (err)
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goto err_free;
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dev_hold(dev); /* we return an incremented device refcount */
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return dev;
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err_free:
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free_netdev(dev);
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err:
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return ERR_PTR(err);
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}
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struct ieee802154_dev *
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ieee802154_alloc_device(size_t priv_data_len, struct ieee802154_ops *ops)
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{
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struct wpan_phy *phy;
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struct mac802154_priv *priv;
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size_t priv_size;
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if (!ops || !ops->xmit || !ops->ed || !ops->start ||
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!ops->stop || !ops->set_channel) {
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printk(KERN_ERR
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"undefined IEEE802.15.4 device operations\n");
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return NULL;
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}
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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 mac802154_priv 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 mac802154_priv |
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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 allign them here.
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*/
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priv_size = ALIGN(sizeof(*priv), NETDEV_ALIGN) + priv_data_len;
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phy = wpan_phy_alloc(priv_size);
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if (!phy) {
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printk(KERN_ERR
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"failure to allocate master IEEE802.15.4 device\n");
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return NULL;
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}
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priv = wpan_phy_priv(phy);
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priv->hw.phy = priv->phy = phy;
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priv->hw.priv = (char *)priv + ALIGN(sizeof(*priv), NETDEV_ALIGN);
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priv->ops = ops;
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INIT_LIST_HEAD(&priv->slaves);
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mutex_init(&priv->slaves_mtx);
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return &priv->hw;
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}
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EXPORT_SYMBOL(ieee802154_alloc_device);
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void ieee802154_free_device(struct ieee802154_dev *hw)
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{
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struct mac802154_priv *priv = mac802154_to_priv(hw);
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BUG_ON(!list_empty(&priv->slaves));
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mutex_destroy(&priv->slaves_mtx);
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wpan_phy_free(priv->phy);
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}
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EXPORT_SYMBOL(ieee802154_free_device);
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int ieee802154_register_device(struct ieee802154_dev *dev)
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{
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struct mac802154_priv *priv = mac802154_to_priv(dev);
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int rc = -ENOMEM;
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priv->dev_workqueue =
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create_singlethread_workqueue(wpan_phy_name(priv->phy));
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if (!priv->dev_workqueue)
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goto out;
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wpan_phy_set_dev(priv->phy, priv->hw.parent);
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priv->phy->add_iface = mac802154_add_iface;
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priv->phy->del_iface = mac802154_del_iface;
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rc = wpan_phy_register(priv->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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mutex_lock(&priv->slaves_mtx);
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priv->running = MAC802154_DEVICE_RUN;
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mutex_unlock(&priv->slaves_mtx);
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rtnl_unlock();
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return 0;
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out_wq:
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destroy_workqueue(priv->dev_workqueue);
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out:
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return rc;
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}
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EXPORT_SYMBOL(ieee802154_register_device);
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void ieee802154_unregister_device(struct ieee802154_dev *dev)
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{
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struct mac802154_priv *priv = mac802154_to_priv(dev);
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struct mac802154_sub_if_data *sdata, *next;
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flush_workqueue(priv->dev_workqueue);
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destroy_workqueue(priv->dev_workqueue);
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rtnl_lock();
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mutex_lock(&priv->slaves_mtx);
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priv->running = MAC802154_DEVICE_STOPPED;
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mutex_unlock(&priv->slaves_mtx);
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list_for_each_entry_safe(sdata, next, &priv->slaves, list) {
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mutex_lock(&sdata->hw->slaves_mtx);
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list_del(&sdata->list);
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mutex_unlock(&sdata->hw->slaves_mtx);
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unregister_netdevice(sdata->dev);
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}
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rtnl_unlock();
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wpan_phy_unregister(priv->phy);
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}
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EXPORT_SYMBOL(ieee802154_unregister_device);
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MODULE_DESCRIPTION("IEEE 802.15.4 implementation");
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MODULE_LICENSE("GPL v2");
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