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mac80211: clean up sta_info_destroy() users wrt. RCU/locking 

Calling sta_info_destroy() doesn't require RCU-synchronisation
before-hand because it does that internally. However, it does
require rtnl-locking so insert that where necessary.

Also clean up the code doing it internally to be a bit clearer and
not synchronize twice if keys are configured.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Johannes Berg 2008-03-31 19:23:02 +02:00 committed by John W. Linville
parent 93e5deb1ae
commit 4f6fab472c
3 changed files with 20 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
net/mac80211/cfg.c
View File

@ -700,11 +700,7 @@ static int ieee80211_del_station(struct wiphy *wiphy, struct net_device *dev,
return -ENOENT;
sta_info_unlink(&sta);
if (sta) {
synchronize_rcu();
sta_info_destroy(sta);
}
sta_info_destroy(sta);
} else
sta_info_flush(local, sdata);

1
net/mac80211/ieee80211_sta.c
View File

@ -939,7 +939,6 @@ static void ieee80211_associated(struct net_device *dev,
rcu_read_unlock();
if (disassoc && sta) {
synchronize_rcu();
rtnl_lock();
sta_info_destroy(sta);
rtnl_unlock();

33
net/mac80211/sta_info.c
View File

@ -180,13 +180,22 @@ void sta_info_destroy(struct sta_info *sta)
mesh_plink_deactivate(sta);
#endif
/*
* NOTE: This will call synchronize_rcu() internally to
* make sure no key references can be in use. We rely on
* that here for the mesh code!
*/
ieee80211_key_free(sta->key);
WARN_ON(sta->key);
if (sta->key) {
/*
* NOTE: This will call synchronize_rcu() internally to
* make sure no key references can be in use. We rely on
* that when we take this branch to make sure nobody can
* reference this STA struct any longer!
*/
ieee80211_key_free(sta->key);
WARN_ON(sta->key);
} else {
/*
* Make sure that nobody can reference this STA struct
* any longer.
*/
synchronize_rcu();
}
#ifdef CONFIG_MAC80211_MESH
if (ieee80211_vif_is_mesh(&sta->sdata->vif))
@ -628,11 +637,9 @@ static void sta_info_debugfs_add_work(struct work_struct *work)
rate_control_add_sta_debugfs(sta);
sta = __sta_info_unpin(sta);
if (sta) {
synchronize_rcu();
sta_info_destroy(sta);
}
rtnl_lock();
sta_info_destroy(sta);
rtnl_unlock();
}
}
#endif
@ -694,8 +701,6 @@ int sta_info_flush(struct ieee80211_local *local,
}
spin_unlock_irqrestore(&local->sta_lock, flags);
synchronize_rcu();
list_for_each_entry_safe(sta, tmp, &tmp_list, list)
sta_info_destroy(sta);