linux-kernel - [PATCH 2/5] de2104x: Call netif_carrier_off() after register

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Date:	Tue, 14 Aug 2012 14:28:52 +0400
From:	Ilya Shchepetkov <shchepetkov@...ras.ru>
To:	Grant Grundler <grundler@...isc-linux.org>
Cc:	Ilya Shchepetkov <shchepetkov@...ras.ru>,
	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, ldv-project@...ras.ru
Subject: [PATCH 2/5] de2104x: Call netif_carrier_off() after register_netdev()

For carrier detection to work properly when binding the driver with a
cable unplugged, netif_carrier_off() should be called after
register_netdev(), not before.

Calling netif_carrier_off() before register_netdev() was causing the
network interface to miss a linkwatch pending event leading to an
inconsistent state if the link is not up when interface is initialized.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Ilya Shchepetkov <shchepetkov@...ras.ru>
---
 drivers/net/ethernet/dec/tulip/de2104x.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/dec/tulip/de2104x.c b/drivers/net/ethernet/dec/tulip/de2104x.c
index 61cc093..237f254 100644
--- a/drivers/net/ethernet/dec/tulip/de2104x.c
+++ b/drivers/net/ethernet/dec/tulip/de2104x.c
@@ -2005,8 +2005,6 @@ static int __devinit de_init_one (struct pci_dev *pdev,
 		de->media_timer.function = de21041_media_timer;
 	de->media_timer.data = (unsigned long) de;
 
-	netif_carrier_off(dev);
-
 	/* wake up device, assign resources */
 	rc = pci_enable_device(pdev);
 	if (rc)
@@ -2074,6 +2072,9 @@ static int __devinit de_init_one (struct pci_dev *pdev,
 	rc = register_netdev(dev);
 	if (rc)
 		goto err_out_iomap;
+
+	/* turn off carrier */
+	netif_carrier_off(dev);
 
 	/* print info about board and interface just registered */
 	netdev_info(dev, "%s at %p, %pM, IRQ %d\n",
-- 
1.7.7

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