From 27d6162944b9b34c32cd5841acd21786637ee743 Mon Sep 17 00:00:00 2001
From: Stuart Hayes <stuart.w.hayes@gmail.com>
Date: Wed, 4 Oct 2017 10:57:52 -0500
Subject: [PATCH] PCI: Create SR-IOV virtfn/physfn links before attaching driver
Git-commit: 27d6162944b9b34c32cd5841acd21786637ee743
Patch-mainline: v4.15-rc1
References: bsc#1051510

When creating virtual functions, create the "virtfn%u" and "physfn" links
in sysfs *before* attaching the driver instead of after.  When we attach
the driver to the new virtual network interface first, there is a race when
the driver attaches to the new sends out an "add" udev event, and the
network interface naming software (biosdevname or systemd, for example)
tries to look at these links.

Signed-off-by: Stuart Hayes <stuart.w.hayes@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/pci/iov.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/pci/iov.c
+++ b/drivers/pci/iov.c
@@ -159,7 +159,6 @@ int pci_iov_add_virtfn(struct pci_dev *d
 
 	pci_device_add(virtfn, virtfn->bus);
 
-	pci_bus_add_device(virtfn);
 	sprintf(buf, "virtfn%u", id);
 	rc = sysfs_create_link(&dev->dev.kobj, &virtfn->dev.kobj, buf);
 	if (rc)
@@ -170,6 +169,8 @@ int pci_iov_add_virtfn(struct pci_dev *d
 
 	kobject_uevent(&virtfn->dev.kobj, KOBJ_CHANGE);
 
+	pci_bus_add_device(virtfn);
+
 	return 0;
 
 failed2: