iwlwifi: mvm: take RCU lock before dereferencing

RCU isn't properly locked.

Fixes: 46d372af9935 ("iwlwifi: mvm: rs: new rate scale API - add FW notifications")
Signed-off-by: Sara Sharon <sara.sharon@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

drivers/net/wireless/intel/iwlwifi/mvm/rs-fw.c

@@ -234,13 +234,15 @@ void iwl_mvm_tlc_update_notif(struct iwl_mvm *mvm, struct iwl_rx_packet *pkt)
 	struct iwl_mvm_sta *mvmsta;
 	struct iwl_lq_sta_rs_fw *lq_sta;
 
+	rcu_read_lock();
+
 	notif = (void *)pkt->data;
 	mvmsta = iwl_mvm_sta_from_staid_rcu(mvm, notif->sta_id);
 
 	if (!mvmsta) {
 		IWL_ERR(mvm, "Invalid sta id (%d) in FW TLC notification\n",
 			notif->sta_id);
-		return;
+		goto out;
 	}
 
 	lq_sta = &mvmsta->lq_sta.rs_fw;
@@ -251,6 +253,8 @@ void iwl_mvm_tlc_update_notif(struct iwl_mvm *mvm, struct iwl_rx_packet *pkt)
 		IWL_DEBUG_RATE(mvm, "new rate_n_flags: 0x%X\n",
 			       lq_sta->last_rate_n_flags);
 	}
+out:
+	rcu_read_unlock();
 }
 
 void rs_fw_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,