wifi: mac80211: fix RCU usage warning in mesh fast-xmit

[ Upstream commit 5ea82df1f50e42416d0a8a7c42d37cc1df1545fe ]

In mesh_fast_tx_flush_addr() we already hold the lock, so
don't need additional hashtable RCU protection. Use the
rhashtable_lookup_fast() variant to avoid RCU protection
warnings.

Fixes: d5edb9ae8d56 ("wifi: mac80211: mesh fast xmit support")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/net/mac80211/mesh_pathtbl.c b/net/mac80211/mesh_pathtbl.c
index d32e304..3e52aaa 100644 (file)
--- a/net/mac80211/mesh_pathtbl.c
+++ b/net/mac80211/mesh_pathtbl.c
@@ -648,7 +648,7 @@ void mesh_fast_tx_flush_addr(struct ieee80211_sub_if_data *sdata,
 
        cache = &sdata->u.mesh.tx_cache;
        spin_lock_bh(&cache->walk_lock);
-       entry = rhashtable_lookup(&cache->rht, addr, fast_tx_rht_params);
+       entry = rhashtable_lookup_fast(&cache->rht, addr, fast_tx_rht_params);
        if (entry)
                mesh_fast_tx_entry_free(cache, entry);
        spin_unlock_bh(&cache->walk_lock);