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| author | Johannes Berg <johannes@sipsolutions.net> | 2008-03-31 19:23:02 +0200 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2008-04-01 17:14:10 -0400 |
| commit | 4f6fab472c4c7c21d577f85fabec7628d4a05637 (patch) | |
| tree | 0949dffadb0b715053e4d7148ebcabe930b39361 /net/mac80211/sta_info.c | |
| parent | 93e5deb1ae39b56f4743955e76c72251256f23c1 (diff) | |
| download | linux-4f6fab472c4c7c21d577f85fabec7628d4a05637.tar.gz linux-4f6fab472c4c7c21d577f85fabec7628d4a05637.tar.bz2 linux-4f6fab472c4c7c21d577f85fabec7628d4a05637.zip | |
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>
Diffstat (limited to 'net/mac80211/sta_info.c')
| -rw-r--r-- | net/mac80211/sta_info.c | 33 |
1 files changed, 19 insertions, 14 deletions
diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c index 5497ca1843fe..dfca96e05d69 100644 --- a/net/mac80211/sta_info.c +++ b/net/mac80211/sta_info.c @@ -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); |