| Age | Commit message (Collapse) | Author | Files | Lines | ||||||||||||||||||||||||
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| 2017-02-07 | Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net | David S. Millernext.git/log/drivers/usb/host/r8a66597-hcd.c?h=nds-private-remove&id=29ba6e7400a317725bdfb86a725d1824447dbcd7'>r8a66597-hcd.c
PCI/ASPM: Handle PCI-to-PCIe bridges as roots of PCIe hierarchies In a struct pcie_link_state, link->root points to the pcie_link_state of
the root of the PCIe hierarchy. For the topmost link, this points to
itself (link->root = link). For others, we copy the pointer from the
parent (link->root = link->parent->root).
Previously we recognized that Root Ports originated PCIe hierarchies, but
we treated PCI/PCI-X to PCIe Bridges as being in the middle of the
hierarchy, and when we tried to copy the pointer from link->parent->root,
there was no parent, and we dereferenced a NULL pointer:
BUG: unable to handle kernel NULL pointer dereference at 0000000000000090
IP: [<ffffffff9e424350>] pcie_aspm_init_link_state+0x170/0x820
Recognize that PCI/PCI-X to PCIe Bridges originate PCIe hierarchies just
like Root Ports do, so link->root for these devices should also point to
itself.
Fixes: 51ebfc92b72b ("PCI: Enumerate switches below PCI-to-PCIe bridges")
Link: https://bugzilla.kernel.org/show_bug.cgi?id=193411
Link: https://bugzilla.opensuse.org/show_bug.cgi?id=1022181
Tested-by: lists@ssl-mail.com
Tested-by: Jayachandran C. <jnair@caviumnetworks.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
CC: stable@vger.kernel.org # v4.2+ Diffstat (limited to 'tools/testing/nvdimm') | ||||||||||||||||||||||||||
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