mac80211: fix IBSS code to not sleep while atomic

With the RCU locking here we sleep while in an atomic context,
since we can sleep just use mutex locking for the interface
list instead of RCU. Sorry, seems I didn't get that in my UML
test.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/net/mac80211/ibss.c b/net/mac80211/ibss.c
index 4f7a54518be41508074496aeb555bdf963f932a5..6030e003180cca92f1dcbf70e7af5217eb4405e7 100644 (file)
--- a/net/mac80211/ibss.c
+++ b/net/mac80211/ibss.c
@@ -784,14 +784,14 @@ void ieee80211_ibss_notify_scan_completed(struct ieee80211_local *local)
 {
        struct ieee80211_sub_if_data *sdata;
 
-       rcu_read_lock();
-       list_for_each_entry_rcu(sdata, &local->interfaces, list) {
+       mutex_lock(&local->iflist_mtx);
+       list_for_each_entry(sdata, &local->interfaces, list) {
                if (sdata->vif.type != NL80211_IFTYPE_ADHOC)
                        continue;
                sdata->u.ibss.last_scan_completed = jiffies;
                ieee80211_sta_find_ibss(sdata);
        }
-       rcu_read_unlock();
+       mutex_unlock(&local->iflist_mtx);
 }
 
 ieee80211_rx_result