fix for igb bugs

igb-fix.patch

commit 7def9e7f9b8738201677a9fa8d3f0bbe4c881b9a
Author: Joe Damato <joe@boundary.com>
Date:   Tue Sep 20 17:32:20 2011 +0000

    Fix for igb 2 second reporting bug and ioctl/stats race condition.

diff --git a/drivers/net/igb/igb.h b/drivers/net/igb/igb.h
index b1c1eb8..ce42798 100644
--- a/drivers/net/igb/igb.h
+++ b/drivers/net/igb/igb.h
@@ -284,6 +284,8 @@ struct igb_adapter {
 	struct timecompare compare;
 	struct hwtstamp_config hwtstamp_config;
 
+	spinlock_t stats_lock;
+
 	/* structs defined in e1000_hw.h */
 	struct e1000_hw hw;
 	struct e1000_hw_stats stats;
diff --git a/drivers/net/igb/igb_ethtool.c b/drivers/net/igb/igb_ethtool.c
index 550ad93..f97b4c5 100644
--- a/drivers/net/igb/igb_ethtool.c
+++ b/drivers/net/igb/igb_ethtool.c
@@ -1991,7 +1991,9 @@ static void igb_get_ethtool_stats(struct net_device *netdev,
 	u64 *queue_stat;
 	int i, j, k;
 	char *p;
+	unsigned long flags;
 
+	spin_lock_irqsave(&adapter->stats_lock, flags);
 	igb_update_stats(adapter);
 
 	for (i = 0; i < IGB_GLOBAL_STATS_LEN; i++) {
@@ -2014,6 +2016,7 @@ static void igb_get_ethtool_stats(struct net_device *netdev,
 		for (k = 0; k < IGB_RX_QUEUE_STATS_LEN; k++, i++)
 			data[i] = queue_stat[k];
 	}
+	spin_unlock_irqrestore(&adapter->stats_lock, flags);
 }
 
 static void igb_get_strings(struct net_device *netdev, u32 stringset, u8 *data)
diff --git a/drivers/net/igb/igb_main.c b/drivers/net/igb/igb_main.c
index 4370842..b956888 100644
--- a/drivers/net/igb/igb_main.c
+++ b/drivers/net/igb/igb_main.c
@@ -1157,6 +1157,7 @@ void igb_down(struct igb_adapter *adapter)
 	struct e1000_hw *hw = &adapter->hw;
 	u32 tctl, rctl;
 	int i;
+	unsigned long flags;
 
 	/* signal that we're down so the interrupt handler does not
 	 * reschedule our watchdog timer */
@@ -1191,7 +1192,9 @@ void igb_down(struct igb_adapter *adapter)
 	netif_carrier_off(netdev);
 
 	/* record the stats before reset*/
+	spin_lock_irqsave(&adapter->stats_lock, flags);
 	igb_update_stats(adapter);
+	spin_unlock_irqrestore(&adapter->stats_lock, flags);
 
 	adapter->link_speed = 0;
 	adapter->link_duplex = 0;
@@ -1534,6 +1537,8 @@ static int __devinit igb_probe(struct pci_dev *pdev,
 		goto err_eeprom;
 	}
 
+	spin_lock_init(&adapter->stats_lock);
+
 	setup_timer(&adapter->watchdog_timer, &igb_watchdog,
 	            (unsigned long) adapter);
 	setup_timer(&adapter->phy_info_timer, &igb_update_phy_info,
@@ -3120,7 +3125,10 @@ static void igb_watchdog_task(struct work_struct *work)
 		}
 	}
 
+	spin_lock(&adapter->stats_lock);
 	igb_update_stats(adapter);
+	spin_unlock(&adapter->stats_lock);
+
 	igb_update_adaptive(hw);
 
 	for (i = 0; i < adapter->num_tx_queues; i++) {
@@ -3856,7 +3864,13 @@ static void igb_reset_task(struct work_struct *work)
  **/
 static struct net_device_stats *igb_get_stats(struct net_device *netdev)
 {
-	/* only return the current stats */
+	struct igb_adapter *adapter = netdev_priv(netdev);
+	unsigned long flags;
+
+	spin_lock_irqsave(&adapter->stats_lock, flags);
+	igb_update_stats(adapter);
+	spin_unlock_irqrestore(&adapter->stats_lock, flags);
+
 	return &netdev->stats;
 }
 
@@ -3930,7 +3944,7 @@ static int igb_change_mtu(struct net_device *netdev, int new_mtu)
 
 void igb_update_stats(struct igb_adapter *adapter)
 {
-	struct net_device_stats *net_stats = igb_get_stats(adapter->netdev);
+	struct net_device_stats *net_stats = &adapter->netdev->stats;
 	struct e1000_hw *hw = &adapter->hw;
 	struct pci_dev *pdev = adapter->pdev;
 	u32 rnbc;