diff options
Diffstat (limited to 'net/wireless/core.c')
| -rw-r--r-- | net/wireless/core.c | 43 |
1 files changed, 30 insertions, 13 deletions
diff --git a/net/wireless/core.c b/net/wireless/core.c index c2a2c563d21a..71b6b3a9cf1f 100644 --- a/net/wireless/core.c +++ b/net/wireless/core.c @@ -1,7 +1,7 @@ /* * This is the linux wireless configuration interface. * - * Copyright 2006-2009 Johannes Berg <johannes@sipsolutions.net> + * Copyright 2006-2010 Johannes Berg <johannes@sipsolutions.net> */ #include <linux/if.h> @@ -31,15 +31,10 @@ MODULE_AUTHOR("Johannes Berg"); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("wireless configuration support"); -/* RCU might be appropriate here since we usually - * only read the list, and that can happen quite - * often because we need to do it for each command */ +/* RCU-protected (and cfg80211_mutex for writers) */ LIST_HEAD(cfg80211_rdev_list); int cfg80211_rdev_list_generation; -/* - * This is used to protect the cfg80211_rdev_list - */ DEFINE_MUTEX(cfg80211_mutex); /* for debugfs */ @@ -402,6 +397,7 @@ struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv) rdev->wiphy.retry_long = 4; rdev->wiphy.frag_threshold = (u32) -1; rdev->wiphy.rts_threshold = (u32) -1; + rdev->wiphy.coverage_class = 0; return &rdev->wiphy; } @@ -417,6 +413,18 @@ int wiphy_register(struct wiphy *wiphy) int i; u16 ifmodes = wiphy->interface_modes; + if (WARN_ON(wiphy->addresses && !wiphy->n_addresses)) + return -EINVAL; + + if (WARN_ON(wiphy->addresses && + !is_zero_ether_addr(wiphy->perm_addr) && + memcmp(wiphy->perm_addr, wiphy->addresses[0].addr, + ETH_ALEN))) + return -EINVAL; + + if (wiphy->addresses) + memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN); + /* sanity check ifmodes */ WARN_ON(!ifmodes); ifmodes &= ((1 << __NL80211_IFTYPE_AFTER_LAST) - 1) & ~1; @@ -476,7 +484,7 @@ int wiphy_register(struct wiphy *wiphy) /* set up regulatory info */ wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE); - list_add(&rdev->list, &cfg80211_rdev_list); + list_add_rcu(&rdev->list, &cfg80211_rdev_list); cfg80211_rdev_list_generation++; mutex_unlock(&cfg80211_mutex); @@ -553,7 +561,8 @@ void wiphy_unregister(struct wiphy *wiphy) * it impossible to find from userspace. */ debugfs_remove_recursive(rdev->wiphy.debugfsdir); - list_del(&rdev->list); + list_del_rcu(&rdev->list); + synchronize_rcu(); /* * Try to grab rdev->mtx. If a command is still in progress, @@ -669,7 +678,7 @@ static int cfg80211_netdev_notifier_call(struct notifier_block * nb, INIT_LIST_HEAD(&wdev->event_list); spin_lock_init(&wdev->event_lock); mutex_lock(&rdev->devlist_mtx); - list_add(&wdev->list, &rdev->netdev_list); + list_add_rcu(&wdev->list, &rdev->netdev_list); rdev->devlist_generation++; /* can only change netns with wiphy */ dev->features |= NETIF_F_NETNS_LOCAL; @@ -745,9 +754,9 @@ static int cfg80211_netdev_notifier_call(struct notifier_block * nb, mutex_unlock(&rdev->devlist_mtx); dev_put(dev); } -#ifdef CONFIG_CFG80211_WEXT cfg80211_lock_rdev(rdev); mutex_lock(&rdev->devlist_mtx); +#ifdef CONFIG_CFG80211_WEXT wdev_lock(wdev); switch (wdev->iftype) { case NL80211_IFTYPE_ADHOC: @@ -760,10 +769,10 @@ static int cfg80211_netdev_notifier_call(struct notifier_block * nb, break; } wdev_unlock(wdev); +#endif rdev->opencount++; mutex_unlock(&rdev->devlist_mtx); cfg80211_unlock_rdev(rdev); -#endif break; case NETDEV_UNREGISTER: /* @@ -781,13 +790,21 @@ static int cfg80211_netdev_notifier_call(struct notifier_block * nb, */ if (!list_empty(&wdev->list)) { sysfs_remove_link(&dev->dev.kobj, "phy80211"); - list_del_init(&wdev->list); + list_del_rcu(&wdev->list); rdev->devlist_generation++; #ifdef CONFIG_CFG80211_WEXT kfree(wdev->wext.keys); #endif } mutex_unlock(&rdev->devlist_mtx); + /* + * synchronise (so that we won't find this netdev + * from other code any more) and then clear the list + * head so that the above code can safely check for + * !list_empty() to avoid double-cleanup. + */ + synchronize_rcu(); + INIT_LIST_HEAD(&wdev->list); break; case NETDEV_PRE_UP: if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype))) |
