o LLC: remove unused list_head from llc_opt & use rw_lock_init for rwlocks

include/net/llc_conn.h

@@ -21,7 +21,6 @@ struct llc_timer {
 };
 
 struct llc_opt {
-	struct list_head    node;		/* entry in sap->sk_list.list */
 	struct sock	    *sk;		/* sock that has this llc_opt */
 	struct sockaddr_llc addr;		/* address sock is bound to */
 	u8		    state;		/* state of connection */

net/llc/llc_main.c

@@ -70,7 +70,7 @@ struct llc_sap *llc_sap_alloc(void)
 		memset(sap, 0, sizeof(*sap));
 		sap->state = LLC_SAP_STATE_ACTIVE;
 		memcpy(sap->laddr.mac, llc_main_station.mac_sa, ETH_ALEN);
-		spin_lock_init(&sap->sk_list.lock);
+		rwlock_init(&sap->sk_list.lock);
 	}
 	return sap;
 }
@@ -639,7 +639,7 @@ static int __init llc_init(void)
 
 	printk(llc_banner);
 	INIT_LIST_HEAD(&llc_main_station.sap_list.list);
-	spin_lock_init(&llc_main_station.sap_list.lock);
+	rwlock_init(&llc_main_station.sap_list.lock);
 	skb_queue_head_init(&llc_main_station.mac_pdu_q);
 	skb_queue_head_init(&llc_main_station.ev_q.list);
 	spin_lock_init(&llc_main_station.ev_q.lock);