qla3xxx: bugfix: Add memory barrier before accessing rx completion.

Signed-off-by: NRon Mercer <ron.mercer@qlogic.com>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

drivers/net/qla3xxx.c

@@ -2248,6 +2248,7 @@ static int ql_tx_rx_clean(struct ql3_adapter *qdev,
 		qdev->rsp_consumer_index) && (work_done < work_to_do)) {
 
 		net_rsp = qdev->rsp_current;
+		rmb();
 		switch (net_rsp->opcode) {
 
 		case OPCODE_OB_MAC_IOCB_FN0: