mac80211: fix spinlock recursion

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>

1 files changed, 10 insertions, 10 deletions

diff --git a/net/mac80211/key.c b/net/mac80211/key.c
index acf8d0370a37..b98711dcdc54 100644
--- a/net/mac80211/key.c
+++ b/net/mac80211/key.c
@@ -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();