ibmvnic: Fix cleanup of SKB's on driver close

A race condition occurs when closing the driver. Free'ing of skb's
can race between the close routine and ibmvnic_tx_interrupt. To fix
this we move the claenup of tx pools during close to after the
sub-CRQ interrupts are disabled.
Signed-off-by: NThomas Falcon <tlfalcon@linux.vnet.ibm.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/ibm/ibmvnic.c

@@ -804,7 +804,6 @@ static int __ibmvnic_close(struct net_device *netdev)
 	adapter->state = VNIC_CLOSING;
 	netif_tx_stop_all_queues(netdev);
 	ibmvnic_napi_disable(adapter);
-	clean_tx_pools(adapter);
 
 	if (adapter->tx_scrq) {
 		for (i = 0; i < adapter->req_tx_queues; i++)
@@ -833,6 +832,7 @@ static int __ibmvnic_close(struct net_device *netdev)
 		}
 	}
 
+	clean_tx_pools(adapter);
 	adapter->state = VNIC_CLOSED;
 	return rc;
 }