Commit 3d58444d authored by Bjorn Helgaas's avatar Bjorn Helgaas Committed by Greg Kroah-Hartman

PCI: Ignore BAR updates on virtual functions

[ Upstream commit 63880b23 ]

VF BARs are read-only zero, so updating VF BARs will not have any effect.
See the SR-IOV spec r1.1, sec 3.4.1.11.

We already ignore these updates because of 70675e0b ("PCI: Don't try to
restore VF BARs"); this merely restructures it slightly to make it easier
to split updates for standard and SR-IOV BARs.
Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
Reviewed-by: default avatarGavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: default avatarSasha Levin <alexander.levin@verizon.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 74cce811
......@@ -564,10 +564,6 @@ static void pci_restore_bars(struct pci_dev *dev)
{
int i;
/* Per SR-IOV spec 3.4.1.11, VF BARs are RO zero */
if (dev->is_virtfn)
return;
for (i = 0; i < PCI_BRIDGE_RESOURCES; i++)
pci_update_resource(dev, i);
}
......
......@@ -34,10 +34,9 @@ static void pci_std_update_resource(struct pci_dev *dev, int resno)
int reg;
struct resource *res = dev->resource + resno;
if (dev->is_virtfn) {
dev_warn(&dev->dev, "can't update VF BAR%d\n", resno);
/* Per SR-IOV spec 3.4.1.11, VF BARs are RO zero */
if (dev->is_virtfn)
return;
}
/*
* Ignore resources for unimplemented BARs and unused resource slots
......
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