linux-kernel - [PATCH v2 1/2] igb: Teardown SR-IOV before unregister

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Message-ID: <20150729203814.10732.38094.stgit@gimli.home>
Date:	Wed, 29 Jul 2015 14:38:15 -0600
From:	Alex Williamson <alex.williamson@...hat.com>
To:	intel-wired-lan@...ts.osuosl.org, davem@...emloft.net,
	jeffrey.t.kirsher@...el.com
Cc:	netdev@...r.kernel.org, mitch.a.williams@...el.com,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 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@...hat.com>
Acked-by: Mitch Williams <mitch.a.williams@...el.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 2f70a9b..417cc9c 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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