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| author | Bjorn Helgaas <bhelgaas@google.com> | 2016-11-28 11:19:27 -0600 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2016-11-28 11:37:56 -0600 |
| commit | 63880b230a4af502c56dde3d4588634c70c66006 (patch) | |
| tree | 47cd7eb55cd6d8c8366ef316bc1795bf9233a127 /drivers/pci/setup-res.c | |
| parent | f40ec3c748c6912f6266c56a7f7992de61b255ed (diff) | |
| download | linux-63880b230a4af502c56dde3d4588634c70c66006.tar.gz linux-63880b230a4af502c56dde3d4588634c70c66006.tar.bz2 linux-63880b230a4af502c56dde3d4588634c70c66006.zip | |
PCI: Ignore BAR updates on virtual functions
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 70675e0b6a1a ("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: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Diffstat (limited to 'drivers/pci/setup-res.c')
| -rw-r--r-- | drivers/pci/setup-res.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c index 66c4d8f42233..d2a32d88d2ae 100644 --- a/drivers/pci/setup-res.c +++ b/drivers/pci/setup-res.c @@ -36,10 +36,9 @@ void pci_update_resource(struct pci_dev *dev, int resno) enum pci_bar_type type; 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 |