PCI: Add VPD function 0 quirk for Intel Ethernet devices

commit 7aa6ca4d upstream.

Set the PCI_DEV_FLAGS_VPD_REF_F0 flag on all Intel Ethernet device
functions other than function 0, so that on multi-function devices, we will
always read VPD from function 0 instead of from the other functions.

[bhelgaas: changelog]
Signed-off-by: Mark Rustad <mark.d.rustad@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Alexander Duyck <alexander.h.duyck@redhat.com>
[bwh: Backported to 3.2:
 - Put the class check in the new function as there is no
   DECLARE_PCI_FIXUP_CLASS_EARLY(
 - Adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

drivers/pci/quirks.c

@@ -1941,6 +1941,15 @@ static void __devinit quirk_netmos(struct pci_dev *dev)
 }
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NETMOS, PCI_ANY_ID, quirk_netmos);
 
+static void quirk_f0_vpd_link(struct pci_dev *dev)
+{
+	if ((dev->class >> 8) != PCI_CLASS_NETWORK_ETHERNET ||
+	    !dev->multifunction || !PCI_FUNC(dev->devfn))
+		return;
+	dev->dev_flags |= PCI_DEV_FLAGS_VPD_REF_F0;
+}
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, PCI_ANY_ID, quirk_f0_vpd_link);
+
 static void __devinit quirk_e100_interrupt(struct pci_dev *dev)
 {
 	u16 command, pmcsr;