Patch "PCI/ASPM: Deal with missing root ports in link state handling" has been added to the 4.9-stable tree

Patch "PCI/ASPM: Deal with missing root ports in link state handling" has been added to the 4.9-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    PCI/ASPM: Deal with missing root ports in link state handling

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     pci-aspm-deal-with-missing-root-ports-in-link-state-handling.patch
and it can be found in the queue-4.9 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 ee8bdfb6568d86bb93f55f8d99c4c643e77304ee Mon Sep 17 00:00:00 2001
From: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Date: Mon, 2 Oct 2017 15:08:40 +0100
Subject: PCI/ASPM: Deal with missing root ports in link state handling

From: Ard Biesheuvel <ard.biesheuvel@linaro.org>

commit ee8bdfb6568d86bb93f55f8d99c4c643e77304ee upstream.

Even though it is unconventional, some PCIe host implementations omit the
root ports entirely, and simply consist of a host bridge (which is not
modeled as a device in the PCI hierarchy) and a link.

When the downstream device is an endpoint, our current code does not seem
to mind this unusual configuration. However, when PCIe switches are
involved, the ASPM code assumes that any downstream switch port has a
parent, and blindly dereferences the bus->parent->self field of the pci_dev
struct to chain the downstream link state to the link state of the root
port. Given that the root port is missing, the link is not modeled at all,
and nor is the link state, and attempting to access it results in a NULL
pointer dereference and a crash.

Avoid this by allowing the link state chain to terminate at the downstream
port if no root port exists.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/pci/pcie/aspm.c |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

--- a/drivers/pci/pcie/aspm.c
+++ b/drivers/pci/pcie/aspm.c
@@ -526,10 +526,14 @@ static struct pcie_link_state *alloc_pci
 
 	/*
 	 * Root Ports and PCI/PCI-X to PCIe Bridges are roots of PCIe
-	 * hierarchies.
+	 * hierarchies.  Note that some PCIe host implementations omit
+	 * the root ports entirely, in which case a downstream port on
+	 * a switch may become the root of the link state chain for all
+	 * its subordinate endpoints.
 	 */
 	if (pci_pcie_type(pdev) == PCI_EXP_TYPE_ROOT_PORT ||
-	    pci_pcie_type(pdev) == PCI_EXP_TYPE_PCIE_BRIDGE) {
+	    pci_pcie_type(pdev) == PCI_EXP_TYPE_PCIE_BRIDGE ||
+	    !pdev->bus->parent->self) {
 		link->root = link;
 	} else {
 		struct pcie_link_state *parent;


Patches currently in stable-queue which might be from ard.biesheuvel@linaro.org are

queue-4.9/pci-aspm-deal-with-missing-root-ports-in-link-state-handling.patch