From: Bjorn Helgaas <bhelg...@google.com> [ Upstream commit 977509f7c5c6fb992ffcdf4291051af343b91645 ]
Previously we didn't check the type of device before trying to apply Type 1 (PCI-X) or Type 2 (PCIe) Setting Records from _HPX. We don't support PCI-X Setting Records, so this was harmless, but the warning was useless. We do support PCIe Setting Records, and we didn't check whether a device was PCIe before applying settings. I don't think anything bad happened on non-PCIe devices because pcie_capability_clear_and_set_word(), pcie_cap_has_lnkctl(), etc., would fail before doing any harm. But it's ugly to depend on those internals. Check the device type before attempting to apply Type 1 and Type 2 Setting Records (Type 0 records are applicable to PCI, PCI-X, and PCIe devices). A side benefit is that this prevents useless "not supported" warnings when a BIOS supplies a Type 1 (PCI-X) Setting Record and we try to apply it to every single device: pci 0000:00:00.0: PCI-X settings not supported After this patch, we'll get the warning only when a BIOS supplies a Type 1 record and we have a PCI-X device to which it should be applied. Link: https://bugzilla.kernel.org/show_bug.cgi?id=187731 Signed-off-by: Bjorn Helgaas <bhelg...@google.com> Signed-off-by: Sasha Levin <alexander.le...@verizon.com> --- drivers/pci/probe.c | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-) diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index 7de026897f1d..c43300ced57d 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -1329,8 +1329,16 @@ static void program_hpp_type0(struct pci_dev *dev, struct hpp_type0 *hpp) static void program_hpp_type1(struct pci_dev *dev, struct hpp_type1 *hpp) { - if (hpp) - dev_warn(&dev->dev, "PCI-X settings not supported\n"); + int pos; + + if (!hpp) + return; + + pos = pci_find_capability(dev, PCI_CAP_ID_PCIX); + if (!pos) + return; + + dev_warn(&dev->dev, "PCI-X settings not supported\n"); } static void program_hpp_type2(struct pci_dev *dev, struct hpp_type2 *hpp) @@ -1341,6 +1349,9 @@ static void program_hpp_type2(struct pci_dev *dev, struct hpp_type2 *hpp) if (!hpp) return; + if (!pci_is_pcie(dev)) + return; + if (hpp->revision > 1) { dev_warn(&dev->dev, "PCIe settings rev %d not supported\n", hpp->revision); -- 2.11.0
