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mac80211: fix todo lock

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The key todo lock can be taken from different locks
that require it to be _bh to avoid lock inversion
due to (soft)irqs.

This should fix the two problems reported by Bob and
Gabor:
http://mid.gmane.org/20090619113049.GB18956@hash.localnet
http://mid.gmane.org/4A3FA376.8020307@openwrt.org

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Cc: Bob Copeland <me@bobcopeland.com>
Cc: Gabor Juhos <juhosg@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Johannes Berg 2009-07-01 21:26:43 +02:00 committed by John W. Linville
parent df2b35b65b
commit d3cebbdced
1 changed files with 15 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

28
net/mac80211/key.c
View File

@ -67,6 +67,8 @@ static DECLARE_WORK(todo_work, key_todo);
*
* @key: key to add to do item for
* @flag: todo flag(s)
*
* Must be called with IRQs or softirqs disabled.
*/
static void add_todo(struct ieee80211_key *key, u32 flag)
{
@ -140,9 +142,9 @@ static void ieee80211_key_enable_hw_accel(struct ieee80211_key *key)
ret = drv_set_key(key->local, SET_KEY, &sdata->vif, sta, &key->conf);
if (!ret) {
spin_lock(&todo_lock);
spin_lock_bh(&todo_lock);
key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE;
spin_unlock(&todo_lock);
spin_unlock_bh(&todo_lock);
}
if (ret && ret != -ENOSPC && ret != -EOPNOTSUPP)
@ -164,12 +166,12 @@ static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key)
if (!key || !key->local->ops->set_key)
return;
spin_lock(&todo_lock);
spin_lock_bh(&todo_lock);
if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) {
spin_unlock(&todo_lock);
spin_unlock_bh(&todo_lock);
return;
}
spin_unlock(&todo_lock);
spin_unlock_bh(&todo_lock);
sta = get_sta_for_key(key);
sdata = key->sdata;
@ -188,9 +190,9 @@ static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key)
wiphy_name(key->local->hw.wiphy),
key->conf.keyidx, sta ? sta->addr : bcast_addr, ret);
spin_lock(&todo_lock);
spin_lock_bh(&todo_lock);
key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE;
spin_unlock(&todo_lock);
spin_unlock_bh(&todo_lock);
}
static void __ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata,
@ -437,14 +439,14 @@ void ieee80211_key_link(struct ieee80211_key *key,
__ieee80211_key_replace(sdata, sta, old_key, key);
spin_unlock_irqrestore(&sdata->local->key_lock, flags);
/* free old key later */
add_todo(old_key, KEY_FLAG_TODO_DELETE);
add_todo(key, KEY_FLAG_TODO_ADD_DEBUGFS);
if (netif_running(sdata->dev))
add_todo(key, KEY_FLAG_TODO_HWACCEL_ADD);
spin_unlock_irqrestore(&sdata->local->key_lock, flags);
}
static void __ieee80211_key_free(struct ieee80211_key *key)
@ -547,7 +549,7 @@ static void __ieee80211_key_todo(void)
*/
synchronize_rcu();
spin_lock(&todo_lock);
spin_lock_bh(&todo_lock);
while (!list_empty(&todo_list)) {
key = list_first_entry(&todo_list, struct ieee80211_key, todo);
list_del_init(&key->todo);
@ -558,7 +560,7 @@ static void __ieee80211_key_todo(void)
KEY_FLAG_TODO_HWACCEL_REMOVE |
KEY_FLAG_TODO_DELETE);
key->flags &= ~todoflags;
spin_unlock(&todo_lock);
spin_unlock_bh(&todo_lock);
work_done = false;
@ -591,9 +593,9 @@ static void __ieee80211_key_todo(void)
WARN_ON(!work_done);
spin_lock(&todo_lock);
spin_lock_bh(&todo_lock);
}
spin_unlock(&todo_lock);
spin_unlock_bh(&todo_lock);
}
void ieee80211_key_todo(void)