mac80211: rx: avoid RCU list traversal under mutex

local->sta_mtx is held in __ieee80211_check_fast_rx_iface().
No need to use list_for_each_entry_rcu() as it also requires
a cond argument to avoid false lockdep warnings when not used in
RCU read-side section (with CONFIG_PROVE_RCU_LIST).
Therefore use list_for_each_entry();

Signed-off-by: Madhuparna Bhowmik <madhuparnabhowmik10@gmail.com>
Link: https://lore.kernel.org/r/20200223143302.15390-1-madhuparnabhowmik10@gmail.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 0e05ff0..0ba98ad 100644 (file)
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -4114,7 +4114,7 @@ void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata)
 
        lockdep_assert_held(&local->sta_mtx);
 
-       list_for_each_entry_rcu(sta, &local->sta_list, list) {
+       list_for_each_entry(sta, &local->sta_list, list) {
                if (sdata != sta->sdata &&
                    (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
                        continue;