linux-kernel - [PATCH 5/5] net/hyperv: Call netif_carrier_off() after register

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Message-Id: <1344940135-17079-6-git-send-email-shchepetkov@ispras.ru>
Date:	Tue, 14 Aug 2012 14:28:55 +0400
From:	Ilya Shchepetkov <shchepetkov@...ras.ru>
To:	"K. Y. Srinivasan" <kys@...rosoft.com>
Cc:	Ilya Shchepetkov <shchepetkov@...ras.ru>,
	Haiyang Zhang <haiyangz@...rosoft.com>,
	"David S. Miller" <davem@...emloft.net>,
	devel@...uxdriverproject.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, ldv-project@...ras.ru
Subject: [PATCH 5/5] net/hyperv: 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/hyperv/netvsc_drv.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index 8c5a1c4..5734ad0 100644
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -416,9 +416,6 @@ static int netvsc_probe(struct hv_device *dev,
 	if (!net)
 		return -ENOMEM;
 
-	/* Set initial state */
-	netif_carrier_off(net);
-
 	net_device_ctx = netdev_priv(net);
 	net_device_ctx->device_ctx = dev;
 	hv_set_drvdata(dev, net);
@@ -441,6 +438,9 @@ static int netvsc_probe(struct hv_device *dev,
 		goto out;
 	}
 
+	/* Set initial state */
+	netif_carrier_off(net);
+
 	/* Notify the netvsc driver of the new device */
 	device_info.ring_size = ring_size;
 	ret = rndis_filter_device_add(dev, &device_info);
-- 
1.7.7

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