netdev - [net-next-2.6 PATCH 3/5] igb: fix link down inital state

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Date:	Fri, 17 Apr 2009 23:44:32 -0700
From:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:	davem@...emloft.net
Cc:	netdev@...r.kernel.org, gospo@...hat.com,
	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [net-next-2.6 PATCH 3/5] igb: fix link down inital state

From: Jesse Brandeburg <jesse.brandeburg@...el.com>

As reported by Andrew Lutomirski <amluto@...il.com>

All the intel wired ethernet drivers were calling netif_carrier_off
and netif_stop_queue (or variants) before calling register_netdevice

This is incorrect behavior as was pointed out by davem, and causes
ifconfig and friends to report a strange state before first link
after the driver was loaded, since without a netif_carrier_off, the stack
assumes carrier_on, but before register_netdev, netlink messages are not
sent out telling link state.

This apparently confused *some* versions of networkmanager.

Signed-off-by: Jesse Brandeburg <jesse.brandeburg@...el.com>
Reported-by: Andrew Lutomirski <amluto@...il.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---

 drivers/net/igb/igb_main.c |    9 +++++----
 1 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/net/igb/igb_main.c b/drivers/net/igb/igb_main.c
index 08c8014..ceaa585 100644
--- a/drivers/net/igb/igb_main.c
+++ b/drivers/net/igb/igb_main.c
@@ -1442,15 +1442,14 @@ static int __devinit igb_probe(struct pci_dev *pdev,
 	 * driver. */
 	igb_get_hw_control(adapter);
 
-	/* tell the stack to leave us alone until igb_open() is called */
-	netif_carrier_off(netdev);
-	netif_tx_stop_all_queues(netdev);
-
 	strcpy(netdev->name, "eth%d");
 	err = register_netdev(netdev);
 	if (err)
 		goto err_register;
 
+	/* carrier off reporting is important to ethtool even BEFORE open */
+	netif_carrier_off(netdev);
+
 #ifdef CONFIG_IGB_DCA
 	if (dca_add_requester(&pdev->dev) == 0) {
 		adapter->flags |= IGB_FLAG_DCA_ENABLED;
@@ -1699,6 +1698,8 @@ static int igb_open(struct net_device *netdev)
 	if (test_bit(__IGB_TESTING, &adapter->state))
 		return -EBUSY;
 
+	netif_carrier_off(netdev);
+
 	/* allocate transmit descriptors */
 	err = igb_setup_all_tx_resources(adapter);
 	if (err)

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