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>
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index c642538..ce566f3 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -600,8 +600,7 @@
/*
* The lock only protects the list, hash, timer and counter
* against manipulation, reads are done in RCU. Additionally,
- * the lock protects each BSS's TIM bitmap, a few items in
- * STA info structures and various key pointers.
+ * the lock protects each BSS's TIM bitmap.
*/
spinlock_t sta_lock;
unsigned long num_sta;
@@ -635,6 +634,13 @@
struct list_head interfaces;
+ /*
+ * Key lock, protects sdata's key_list and sta_info's
+ * key pointers (write access, they're RCU.)
+ */
+ spinlock_t key_lock;
+
+
bool sta_sw_scanning;
bool sta_hw_scanning;
int scan_channel_idx;