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authorJohannes Berg <johannes.berg@intel.com>2013-12-04 23:12:31 +0100
committerJohannes Berg <johannes.berg@intel.com>2013-12-16 11:29:47 +0100
commitd778207b06ac1becd012eb689dafdf85feebb179 (patch)
treea6b248949b392e66908cc98aedb2b5b9defc96a1 /net/mac80211/sta_info.c
parentc87820784454bbf7fc63a9e7d9c36762a46f393c (diff)
mac80211: optimise synchronize_net() for sta_info_flush
There's no reason to have one synchronize_net() for each removed station, refactor the code slightly to have just a single synchronize_net() for all stations. Note that this is currently useless as hostapd removes stations one by one and this coalescing never happens. Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'net/mac80211/sta_info.c')
-rw-r--r--net/mac80211/sta_info.c42
1 files changed, 39 insertions, 3 deletions
diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c
index 08e50760e092..89d449d0de6d 100644
--- a/net/mac80211/sta_info.c
+++ b/net/mac80211/sta_info.c
@@ -794,7 +794,7 @@ static bool sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
return have_buffered;
}
-int __must_check __sta_info_destroy(struct sta_info *sta)
+static int __must_check __sta_info_destroy_part1(struct sta_info *sta)
{
struct ieee80211_local *local;
struct ieee80211_sub_if_data *sdata;
@@ -831,7 +831,23 @@ int __must_check __sta_info_destroy(struct sta_info *sta)
rcu_access_pointer(sdata->u.vlan.sta) == sta)
RCU_INIT_POINTER(sdata->u.vlan.sta, NULL);
- synchronize_net();
+ return 0;
+}
+
+static void __sta_info_destroy_part2(struct sta_info *sta)
+{
+ struct ieee80211_local *local = sta->local;
+ struct ieee80211_sub_if_data *sdata = sta->sdata;
+ int ret;
+
+ /*
+ * NOTE: This assumes at least synchronize_net() was done
+ * after _part1 and before _part2!
+ */
+
+ might_sleep();
+ lockdep_assert_held(&local->sta_mtx);
+
/* now keys can no longer be reached */
ieee80211_free_sta_keys(local, sta);
@@ -863,6 +879,18 @@ int __must_check __sta_info_destroy(struct sta_info *sta)
ieee80211_recalc_min_chandef(sdata);
cleanup_single_sta(sta);
+}
+
+int __must_check __sta_info_destroy(struct sta_info *sta)
+{
+ int err = __sta_info_destroy_part1(sta);
+
+ if (err)
+ return err;
+
+ synchronize_net();
+
+ __sta_info_destroy_part2(sta);
return 0;
}
@@ -936,6 +964,7 @@ int sta_info_flush(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_local *local = sdata->local;
struct sta_info *sta, *tmp;
+ LIST_HEAD(free_list);
int ret = 0;
might_sleep();
@@ -943,10 +972,17 @@ int sta_info_flush(struct ieee80211_sub_if_data *sdata)
mutex_lock(&local->sta_mtx);
list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
if (sdata == sta->sdata) {
- WARN_ON(__sta_info_destroy(sta));
+ if (!WARN_ON(__sta_info_destroy_part1(sta)))
+ list_add(&sta->free_list, &free_list);
ret++;
}
}
+
+ if (!list_empty(&free_list)) {
+ synchronize_net();
+ list_for_each_entry_safe(sta, tmp, &free_list, free_list)
+ __sta_info_destroy_part2(sta);
+ }
mutex_unlock(&local->sta_mtx);
return ret;