igb: 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: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index 67ac0eabe6c4a4b0f2722d087fb48d4e7d0e0946..8d22298236ad1e250f26925df3d29a7044529dfb 100644 (file)
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -2809,14 +2809,14 @@ static void igb_remove(struct pci_dev *pdev)
         */
        igb_release_hw_control(adapter);
 
-       unregister_netdev(netdev);
-
-       igb_clear_interrupt_scheme(adapter);
-
 #ifdef CONFIG_PCI_IOV
        igb_disable_sriov(pdev);
 #endif
 
+       unregister_netdev(netdev);
+
+       igb_clear_interrupt_scheme(adapter);
+
        pci_iounmap(pdev, hw->hw_addr);
        if (hw->flash_address)
                iounmap(hw->flash_address);