diff options
Diffstat (limited to 'net/wireless/core.c')
| -rw-r--r-- | net/wireless/core.c | 76 |
1 files changed, 63 insertions, 13 deletions
diff --git a/net/wireless/core.c b/net/wireless/core.c index 69a185ba9ff..c150071b6f2 100644 --- a/net/wireless/core.c +++ b/net/wireless/core.c @@ -430,6 +430,8 @@ struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv) INIT_WORK(&rdev->conn_work, cfg80211_conn_work); INIT_WORK(&rdev->event_work, cfg80211_event_work); + init_waitqueue_head(&rdev->dev_wait); + /* * Initialize wiphy parameters to IEEE 802.11 MIB default values. * Fragmentation and RTS threshold are disabled by default with the @@ -574,7 +576,23 @@ void wiphy_unregister(struct wiphy *wiphy) /* protect the device list */ mutex_lock(&cfg80211_mutex); + wait_event(rdev->dev_wait, ({ + int __count; + mutex_lock(&rdev->devlist_mtx); + __count = rdev->opencount; + mutex_unlock(&rdev->devlist_mtx); + __count == 0;})); + + mutex_lock(&rdev->devlist_mtx); BUG_ON(!list_empty(&rdev->netdev_list)); + mutex_unlock(&rdev->devlist_mtx); + + /* + * First remove the hardware from everywhere, this makes + * it impossible to find from userspace. + */ + cfg80211_debugfs_rdev_del(rdev); + list_del(&rdev->list); /* * Try to grab rdev->mtx. If a command is still in progress, @@ -582,26 +600,18 @@ void wiphy_unregister(struct wiphy *wiphy) * down the device already. We wait for this command to complete * before unlinking the item from the list. * Note: as codified by the BUG_ON above we cannot get here if - * a virtual interface is still associated. Hence, we can only - * get to lock contention here if userspace issues a command - * that identified the hardware by wiphy index. + * a virtual interface is still present. Hence, we can only get + * to lock contention here if userspace issues a command that + * identified the hardware by wiphy index. */ cfg80211_lock_rdev(rdev); - - if (WARN_ON(rdev->scan_req)) { - rdev->scan_req->aborted = true; - ___cfg80211_scan_done(rdev); - } - + /* nothing */ cfg80211_unlock_rdev(rdev); - cfg80211_debugfs_rdev_del(rdev); - /* If this device got a regulatory hint tell core its * free to listen now to a new shiny device regulatory hint */ reg_device_remove(wiphy); - list_del(&rdev->list); cfg80211_rdev_list_generation++; device_del(&rdev->wiphy.dev); debugfs_remove(rdev->wiphy.debugfsdir); @@ -640,6 +650,31 @@ void wiphy_rfkill_set_hw_state(struct wiphy *wiphy, bool blocked) } EXPORT_SYMBOL(wiphy_rfkill_set_hw_state); +static void wdev_cleanup_work(struct work_struct *work) +{ + struct wireless_dev *wdev; + struct cfg80211_registered_device *rdev; + + wdev = container_of(work, struct wireless_dev, cleanup_work); + rdev = wiphy_to_dev(wdev->wiphy); + + cfg80211_lock_rdev(rdev); + + if (WARN_ON(rdev->scan_req && rdev->scan_req->dev == wdev->netdev)) { + rdev->scan_req->aborted = true; + ___cfg80211_scan_done(rdev); + } + + cfg80211_unlock_rdev(rdev); + + mutex_lock(&rdev->devlist_mtx); + rdev->opencount--; + mutex_unlock(&rdev->devlist_mtx); + wake_up(&rdev->dev_wait); + + dev_put(wdev->netdev); +} + static int cfg80211_netdev_notifier_call(struct notifier_block * nb, unsigned long state, void *ndev) @@ -663,6 +698,7 @@ static int cfg80211_netdev_notifier_call(struct notifier_block * nb, * are added with nl80211. */ mutex_init(&wdev->mtx); + INIT_WORK(&wdev->cleanup_work, wdev_cleanup_work); INIT_LIST_HEAD(&wdev->event_list); spin_lock_init(&wdev->event_lock); mutex_lock(&rdev->devlist_mtx); @@ -717,8 +753,22 @@ static int cfg80211_netdev_notifier_call(struct notifier_block * nb, default: break; } + dev_hold(dev); + schedule_work(&wdev->cleanup_work); break; case NETDEV_UP: + /* + * If we have a really quick DOWN/UP succession we may + * have this work still pending ... cancel it and see + * if it was pending, in which case we need to account + * for some of the work it would have done. + */ + if (cancel_work_sync(&wdev->cleanup_work)) { + mutex_lock(&rdev->devlist_mtx); + rdev->opencount--; + mutex_unlock(&rdev->devlist_mtx); + dev_put(dev); + } #ifdef CONFIG_WIRELESS_EXT cfg80211_lock_rdev(rdev); mutex_lock(&rdev->devlist_mtx); @@ -734,6 +784,7 @@ static int cfg80211_netdev_notifier_call(struct notifier_block * nb, break; } wdev_unlock(wdev); + rdev->opencount++; mutex_unlock(&rdev->devlist_mtx); cfg80211_unlock_rdev(rdev); #endif @@ -756,7 +807,6 @@ static int cfg80211_netdev_notifier_call(struct notifier_block * nb, sysfs_remove_link(&dev->dev.kobj, "phy80211"); list_del_init(&wdev->list); rdev->devlist_generation++; - mutex_destroy(&wdev->mtx); #ifdef CONFIG_WIRELESS_EXT kfree(wdev->wext.keys); #endif |