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| author | Håkon Bugge <haakon.bugge@oracle.com> | 2025-11-12 12:54:40 +0300 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2026-01-09 02:52:29 +0300 |
| commit | 73711730a1128d91ebca1a6994ceeb18f36cb0cd (patch) | |
| tree | dd8b03cbfd57a7a8f26f4e374fd88cb3c29170f5 | |
| parent | 8f0b4cce4481fb22653697cced8d0d04027cb1e8 (diff) | |
| download | linux-73711730a1128d91ebca1a6994ceeb18f36cb0cd.tar.xz | |
PCI: Do not attempt to set ExtTag for VFs
The bit for enabling extended tags is Reserved and Preserved (RsvdP) for
VFs, according to PCIe r7.0 section 7.5.3.4 table 7.21. Hence, bail out
early from pci_configure_extended_tags() if the device is a VF.
Otherwise, we may see incorrect log messages such as:
kernel: pci 0000:af:00.2: enabling Extended Tags
(af:00.2 is a VF)
Fixes: 60db3a4d8cc9 ("PCI: Enable PCIe Extended Tags if supported")
Signed-off-by: Håkon Bugge <haakon.bugge@oracle.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Zhu Yanjun <yanjun.zhu@linux.dev>
Link: https://patch.msgid.link/20251112095442.1913258-1-haakon.bugge@oracle.com
| -rw-r--r-- | drivers/pci/probe.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index 41183aed8f5d..86665658d704 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -2270,7 +2270,8 @@ int pci_configure_extended_tags(struct pci_dev *dev, void *ign) u16 ctl; int ret; - if (!pci_is_pcie(dev)) + /* PCI_EXP_DEVCTL_EXT_TAG is RsvdP in VFs */ + if (!pci_is_pcie(dev) || dev->is_virtfn) return 0; ret = pcie_capability_read_dword(dev, PCI_EXP_DEVCAP, &cap); |