ixgbe: Teardown SR-IOV before unregister_netdev()

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@redhat.com>
Acked-by: Mitch Williams <mitch.a.williams@intel.com>
Tested-by: Krishneil Singh <krishneil.k.singh@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index b9267e2..c04480e 100644 (file)
--- 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);