bonding: 3ad: clean up curr_slave_lock usage

Remove the read_lock in bond_3ad_lacpdu_recv() since when the slave is
being released its rx_handler is removed before 3ad unbind, so even if
packets arrive, they won't see the slave in an inconsistent state.
Signed-off-by: NNikolay Aleksandrov <nikolay@redhat.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/bonding/bond_3ad.c

@@ -2476,20 +2476,16 @@ int bond_3ad_xmit_xor(struct sk_buff *skb, struct net_device *dev)
 int bond_3ad_lacpdu_recv(const struct sk_buff *skb, struct bonding *bond,
 			 struct slave *slave)
 {
-	int ret = RX_HANDLER_ANOTHER;
 	struct lacpdu *lacpdu, _lacpdu;
 
 	if (skb->protocol != PKT_TYPE_LACPDU)
-		return ret;
+		return RX_HANDLER_ANOTHER;
 
 	lacpdu = skb_header_pointer(skb, 0, sizeof(_lacpdu), &_lacpdu);
 	if (!lacpdu)
-		return ret;
+		return RX_HANDLER_ANOTHER;
 
-	read_lock(&bond->curr_slave_lock);
-	ret = bond_3ad_rx_indication(lacpdu, slave, skb->len);
-	read_unlock(&bond->curr_slave_lock);
-	return ret;
+	return bond_3ad_rx_indication(lacpdu, slave, skb->len);
 }
 
 /**