[Intel-wired-lan] [PATCH 1/2] igb: Teardown SR-IOV before unregister_netdev()
Williams, Mitch A
mitch.a.williams at intel.com
Mon Jul 27 23:42:09 UTC 2015
ACK
> -----Original Message-----
> From: Intel-wired-lan [mailto:intel-wired-lan-bounces at lists.osuosl.org] On
> Behalf Of Alex Williamson
> Sent: Monday, July 27, 2015 4:19 PM
> To: intel-wired-lan at lists.osuosl.org; Kirsher, Jeffrey T
> Cc: netdev at vger.kernel.org; linux-kernel at vger.kernel.org
> Subject: [Intel-wired-lan] [PATCH 1/2] 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 at redhat.com>
> ---
> drivers/net/ethernet/intel/igb/igb_main.c | 8 ++++----
> 1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/net/ethernet/intel/igb/igb_main.c
> b/drivers/net/ethernet/intel/igb/igb_main.c
> index 517746f..606a7ae 100644
> --- a/drivers/net/ethernet/intel/igb/igb_main.c
> +++ b/drivers/net/ethernet/intel/igb/igb_main.c
> @@ -2805,14 +2805,14 @@ 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);
>
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