netdev - [net-next 02/18] ixgbe: Teardown SR-IOV before unregister

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Date:	Tue, 15 Sep 2015 17:36:27 -0700
From:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:	davem@...emloft.net
Cc:	Alex Williamson <alex.williamson@...hat.com>,
	netdev@...r.kernel.org, nhorman@...hat.com, sassmann@...hat.com,
	jogreene@...hat.com, Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [net-next 02/18] ixgbe: Teardown SR-IOV before unregister_netdev()

From: Alex Williamson <alex.williamson@...hat.com>

When the .remove() callback for a PF is called, SR-IOV support for the
device is disabled, which requires unbinding and removing the VFs.
The VFs may be in-use either by the host kernel or userspace, such as
assigned to a VM through vfio-pci.  In this latter case, the VFs may
be removed either by shutting down the VM or hot-unplugging the
devices from the VM.  Unfortunately in the case of a Windows 2012 R2
guest, hot-unplug is broken due to the ordering of the PF driver
teardown.  Disabling SR-IOV prior to unregister_netdev() avoids this
issue.

Signed-off-by: Alex Williamson <alex.williamson@...hat.com>
Acked-by: Mitch Williams <mitch.a.williams@...el.com>
Tested-by: Krishneil Singh <krishneil.k.singh@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---
 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index b9267e2..c04480e 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -9028,12 +9028,12 @@ static void ixgbe_remove(struct pci_dev *pdev)
 	/* remove the added san mac */
 	ixgbe_del_sanmac_netdev(netdev);
 
-	if (netdev->reg_state == NETREG_REGISTERED)
-		unregister_netdev(netdev);
-
 #ifdef CONFIG_PCI_IOV
 	ixgbe_disable_sriov(adapter);
 #endif
+	if (netdev->reg_state == NETREG_REGISTERED)
+		unregister_netdev(netdev);
+
 	ixgbe_clear_interrupt_scheme(adapter);
 
 	ixgbe_release_hw_control(adapter);
-- 
2.4.3

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