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mac80211: fix spinlock recursion

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When STAs are expired, we need to hold the sta_lock. Using
the same lock for keys too would then mean we'd need another
key free function, and that'll just lead to confusion, so just
use a new spinlock for all key lists.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Johannes Berg
2008-04-11 21:40:35 +02:00
committed by John W. Linville
parent 6b914c5216
commit b16bd15c37
3 changed files with 20 additions and 12 deletions
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20
net/mac80211/key.c
View File

@@ -210,9 +210,9 @@ void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx)
{
unsigned long flags;
spin_lock_irqsave(&sdata->local->sta_lock, flags);
spin_lock_irqsave(&sdata->local->key_lock, flags);
__ieee80211_set_default_key(sdata, idx);
spin_unlock_irqrestore(&sdata->local->sta_lock, flags);
spin_unlock_irqrestore(&sdata->local->key_lock, flags);
}
@@ -339,7 +339,7 @@ void ieee80211_key_link(struct ieee80211_key *key,
}
}
spin_lock_irqsave(&sdata->local->sta_lock, flags);
spin_lock_irqsave(&sdata->local->key_lock, flags);
if (sta)
old_key = sta->key;
@@ -348,7 +348,7 @@ void ieee80211_key_link(struct ieee80211_key *key,
__ieee80211_key_replace(sdata, sta, old_key, key);
spin_unlock_irqrestore(&sdata->local->sta_lock, flags);
spin_unlock_irqrestore(&sdata->local->key_lock, flags);
/* free old key later */
add_todo(old_key, KEY_FLAG_TODO_DELETE);
@@ -377,9 +377,9 @@ void ieee80211_key_free(struct ieee80211_key *key)
if (!key)
return;
spin_lock_irqsave(&key->sdata->local->sta_lock, flags);
spin_lock_irqsave(&key->sdata->local->key_lock, flags);
__ieee80211_key_free(key);
spin_unlock_irqrestore(&key->sdata->local->sta_lock, flags);
spin_unlock_irqrestore(&key->sdata->local->key_lock, flags);
}
/*
@@ -397,10 +397,10 @@ static void ieee80211_todo_for_each_key(struct ieee80211_sub_if_data *sdata,
might_sleep();
spin_lock_irqsave(&sdata->local->sta_lock, flags);
spin_lock_irqsave(&sdata->local->key_lock, flags);
list_for_each_entry(key, &sdata->key_list, list)
add_todo(key, todo_flags);
spin_unlock_irqrestore(&sdata->local->sta_lock, flags);
spin_unlock_irqrestore(&sdata->local->key_lock, flags);
ieee80211_key_todo();
}
@@ -506,10 +506,10 @@ void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata)
ieee80211_debugfs_key_remove_default(sdata);
spin_lock_irqsave(&sdata->local->sta_lock, flags);
spin_lock_irqsave(&sdata->local->key_lock, flags);
list_for_each_entry_safe(key, tmp, &sdata->key_list, list)
__ieee80211_key_free(key);
spin_unlock_irqrestore(&sdata->local->sta_lock, flags);
spin_unlock_irqrestore(&sdata->local->key_lock, flags);
__ieee80211_key_todo();