diff options
| author | Håkon Bugge <haakon.bugge@oracle.com> | 2025-11-12 10:54:40 +0100 |
|---|---|---|
| committer | Sasha Levin <sashal@kernel.org> | 2026-03-04 07:19:39 -0500 |
| commit | cccd21de7dcd694d86ffb5a579566e28f0d18deb (patch) | |
| tree | 6b6b2a3c055ec3960cce9591b7516301f4c33032 | |
| parent | f9b2f54d1977a096da3961c0fe0a8e041e6d1991 (diff) | |
PCI: Do not attempt to set ExtTag for VFs
[ Upstream commit 73711730a1128d91ebca1a6994ceeb18f36cb0cd ]
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
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -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 c37ff0ee53f8..4a72a0163a86 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -2097,7 +2097,8 @@ 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); |