linux-kernel - [PATCH 3.14 02/42] net/mlx4_en: Call register

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Message-Id: <20150426134248.258517130@linuxfoundation.org>
Date:	Sun, 26 Apr 2015 16:01:21 +0200
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Ido Shamay <idos@...lanox.com>,
	Or Gerlitz <ogerlitz@...lanox.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH 3.14 02/42] net/mlx4_en: Call register_netdevice in the proper location

3.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ido Shamay <idos@...lanox.com>

[ Upstream commit e5eda89d97ec256ba14e7e861387cc0468259c18 ]

Netdevice registration should be performed a the end of the driver
initialization flow. If we don't do that, after calling register_netdevice,
device callbacks may be issued by higher layers of the stack before
final configuration of the device is done.

For example (VXLAN configuration race), mlx4_SET_PORT_VXLAN was issued
after the register_netdev command. System network scripts may configure
the interface (UP) right after the registration, which also attach
unicast VXLAN steering rule, before mlx4_SET_PORT_VXLAN was called,
causing the firmware to fail the rule attachment.

Fixes: 837052d0ccc5 ("net/mlx4_en: Add netdev support for TCP/IP offloads of vxlan tunneling")
Signed-off-by: Ido Shamay <idos@...lanox.com>
Signed-off-by: Or Gerlitz <ogerlitz@...lanox.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ethernet/mellanox/mlx4/en_netdev.c |   15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

--- a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
@@ -2497,13 +2497,6 @@ int mlx4_en_init_netdev(struct mlx4_en_d
 	netif_carrier_off(dev);
 	mlx4_en_set_default_moderation(priv);
 
-	err = register_netdev(dev);
-	if (err) {
-		en_err(priv, "Netdev registration failed for port %d\n", port);
-		goto out;
-	}
-	priv->registered = 1;
-
 	en_warn(priv, "Using %d TX rings\n", prof->tx_ring_num);
 	en_warn(priv, "Using %d RX rings\n", prof->rx_ring_num);
 
@@ -2543,6 +2536,14 @@ int mlx4_en_init_netdev(struct mlx4_en_d
 		queue_delayed_work(mdev->workqueue, &priv->service_task,
 				   SERVICE_TASK_DELAY);
 
+	err = register_netdev(dev);
+	if (err) {
+		en_err(priv, "Netdev registration failed for port %d\n", port);
+		goto out;
+	}
+
+	priv->registered = 1;
+
 	return 0;
 
 out:


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