This is a note to let you know that I've just added the patch titled
PCI: Apply _HPX settings only to relevant devices
to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...
The filename of the patch is: pci-apply-_hpx-settings-only-to-relevant-devices.patch and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.
From foo@baz Tue Nov 28 10:56:34 CET 2017
From: Bjorn Helgaas bhelgaas@google.com Date: Mon, 2 Jan 2017 14:04:24 -0600 Subject: PCI: Apply _HPX settings only to relevant devices
From: Bjorn Helgaas bhelgaas@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 bhelgaas@google.com Signed-off-by: Sasha Levin alexander.levin@verizon.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/pci/probe.c | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-)
--- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -1414,8 +1414,16 @@ static void program_hpp_type0(struct pci
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 bool pcie_root_rcb_set(struct pci_dev *dev) @@ -1441,6 +1449,9 @@ static void program_hpp_type2(struct pci 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);
Patches currently in stable-queue which might be from bhelgaas@google.com are
queue-4.4/pci-apply-_hpx-settings-only-to-relevant-devices.patch