netxen:fix napi intr enable check

o netif_running() check for enabling interrupt at end of napi poll is
  not enough to cover firmwar recovery. Instead test __NX_DEV_UP bit.
o Avoid re-entry into to netxen_nic_down() with __NX_DEV_UP bit check.

Acked-by: Dhananjay Phadke <dhananjay.phadke@qlogic.com>
Signed-off-by: Amit Kumar Salecha <amit.salecha@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/net/netxen/netxen_nic_main.c b/drivers/net/netxen/netxen_nic_main.c
index 8ffb30bc798f..f4996846a234 100644
--- a/drivers/net/netxen/netxen_nic_main.c
+++ b/drivers/net/netxen/netxen_nic_main.c
@@ -1011,8 +1011,10 @@ __netxen_nic_down(struct netxen_adapter *adapter, struct net_device *netdev)
         if (adapter->is_up != NETXEN_ADAPTER_UP_MAGIC)
                 return;
 
-        clear_bit(__NX_DEV_UP, &adapter->state);
+        if (!test_and_clear_bit(__NX_DEV_UP, &adapter->state))
+                return;
 
+        smp_mb();
         spin_lock(&adapter->tx_clean_lock);
         netif_carrier_off(netdev);
         netif_tx_disable(netdev);
@@ -2053,7 +2055,7 @@ static int netxen_nic_poll(struct napi_struct *napi, int budget)
 
         if ((work_done < budget) && tx_complete) {
                 napi_complete(&sds_ring->napi);
-                if (netif_running(adapter->netdev))
+                if (test_bit(__NX_DEV_UP, &adapter->state))
                         netxen_nic_enable_int(sds_ring);
         }