i40e: fix null dereference

jbrandeb · davem330 · commit 3c325ced6aef · 2013-12-14T22:59:41.000-05:00
If the vsi-&gt;tx_rings structure is NULL we don't want to panic.

Change-Id: Ic694f043701738c434e8ebe0caf0673f4410dc10
Signed-off-by: Jesse Brandeburg &lt;jesse.brandeburg@intel.com&gt;
Tested-by: Kavindya Deegala &lt;kavindya.s.deegala@intel.com&gt;
Signed-off-by: Jeff Kirsher &lt;jeffrey.t.kirsher@intel.com&gt;
Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;
diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -354,6 +354,9 @@ static struct rtnl_link_stats64 *i40e_get_netdev_stats_struct(
 	struct rtnl_link_stats64 *vsi_stats = i40e_get_vsi_stats_struct(vsi);
 	int i;
 
+	if (!vsi->tx_rings)
+		return stats;
+
 	rcu_read_lock();
 	for (i = 0; i < vsi->num_queue_pairs; i++) {
 		struct i40e_ring *tx_ring, *rx_ring;
