netxen_nic: use spin_[un]lock_bh around tx_clean_lock

While testing this driver with DEBUG_LOCKDEP and DEBUG_SPINLOCK
enabled did not produce any traces, it would be more prudent in the
case of tx_clean_lock to use spin_[un]lock_bh, since this lock is
manipulated in both the process and softirq contexts.

This patch was tested for functionality and regressions with netperf
and DEBUG_LOCKDEP and DEBUG_SPINLOCK enabled.
Signed-off-by: Tony Camuso <tcamuso@redhat.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/qlogic/netxen/netxen_nic_init.c

@@ -135,7 +135,7 @@ void netxen_release_tx_buffers(struct netxen_adapter *adapter)
 	int i, j;
 	struct nx_host_tx_ring *tx_ring = adapter->tx_ring;
 
-	spin_lock(&adapter->tx_clean_lock);
+	spin_lock_bh(&adapter->tx_clean_lock);
 	cmd_buf = tx_ring->cmd_buf_arr;
 	for (i = 0; i < tx_ring->num_desc; i++) {
 		buffrag = cmd_buf->frag_array;
@@ -159,7 +159,7 @@ void netxen_release_tx_buffers(struct netxen_adapter *adapter)
 		}
 		cmd_buf++;
 	}
-	spin_unlock(&adapter->tx_clean_lock);
+	spin_unlock_bh(&adapter->tx_clean_lock);
 }
 
 void netxen_free_sw_resources(struct netxen_adapter *adapter)