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authorJohannes Berg <johannes@sipsolutions.net>2009-08-07 16:17:38 +0200
committerJohn W. Linville <linville@tuxdriver.com>2009-08-14 09:13:43 -0400
commitf5ea9120be2e5d5c846243416cfdce01d02f5836 (patch)
treecade27e47a90dde79a523598b96a2ebb50770d2f /net/wireless/core.c
parentf401a6f7ede753e56b84025e7d2db0d5ef560ce6 (diff)
nl80211: add generation number to all dumps
In order for userspace to be able to figure out whether it obtained a consistent snapshot of data or not when using netlink dumps, we need to have a generation number in each dump message that indicates whether the list has changed or not -- its value is arbitrary. This patch adds such a number to all dumps, this needs some mac80211 involvement to keep track of a generation number to start with when adding/removing mesh paths or stations. The wiphy and netdev lists can be fully handled within cfg80211, of course, but generation numbers need to be stored there as well. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/wireless/core.c')
-rw-r--r--net/wireless/core.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/net/wireless/core.c b/net/wireless/core.c
index 1e189306560..62e1ac00879 100644
--- a/net/wireless/core.c
+++ b/net/wireless/core.c
@@ -32,6 +32,7 @@ MODULE_DESCRIPTION("wireless configuration support");
* only read the list, and that can happen quite
* often because we need to do it for each command */
LIST_HEAD(cfg80211_rdev_list);
+int cfg80211_rdev_list_generation;
/*
* This is used to protect the cfg80211_rdev_list
@@ -511,6 +512,7 @@ int wiphy_register(struct wiphy *wiphy)
wiphy_update_regulatory(wiphy, NL80211_REGDOM_SET_BY_CORE);
list_add(&rdev->list, &cfg80211_rdev_list);
+ cfg80211_rdev_list_generation++;
mutex_unlock(&cfg80211_mutex);
@@ -593,6 +595,7 @@ void wiphy_unregister(struct wiphy *wiphy)
reg_device_remove(wiphy);
list_del(&rdev->list);
+ cfg80211_rdev_list_generation++;
device_del(&rdev->wiphy.dev);
debugfs_remove(rdev->wiphy.debugfsdir);
@@ -653,6 +656,7 @@ static int cfg80211_netdev_notifier_call(struct notifier_block * nb,
spin_lock_init(&wdev->event_lock);
mutex_lock(&rdev->devlist_mtx);
list_add(&wdev->list, &rdev->netdev_list);
+ rdev->devlist_generation++;
/* can only change netns with wiphy */
dev->features |= NETIF_F_NETNS_LOCAL;
@@ -733,6 +737,7 @@ 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);
+ rdev->devlist_generation++;
mutex_destroy(&wdev->mtx);
#ifdef CONFIG_WIRELESS_EXT
kfree(wdev->wext.keys);