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linux/drivers/pci
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Bjorn Helgaas 030305d69f 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: 51ebfc92b7 ("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+
2017-01-27 15:00:45 -06:00
..
host PCI/MSI: pci-xgene-msi: Fix CPU hotplug registration handling 2017-01-17 08:41:51 -06:00
hotplug Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
pcie PCI/ASPM: Handle PCI-to-PCIe bridges as roots of PCIe hierarchies 2017-01-27 15:00:45 -06:00
access.c
ats.c
bus.c
ecam.c PCI: Add MCFG quirks for Qualcomm QDF2432 host controller 2016-12-06 13:45:49 -06:00
host-bridge.c
hotplug-pci.c
htirq.c
iov.c
irq.c
Kconfig
Makefile
msi.c pci-v4.10-changes 2016-12-15 12:46:48 -08:00
of.c
pci-acpi.c Merge branch 'pci/pm' into next 2016-12-12 11:25:04 -06:00
pci-driver.c
pci-label.c
pci-mid.c pci-v4.10-changes 2016-12-15 12:46:48 -08:00
pci-stub.c
pci-sysfs.c
pci.c Merge branch 'pci/virtualization' into next 2016-12-12 11:25:05 -06:00
pci.h Merge branch 'pci/virtualization' into next 2016-12-12 11:25:05 -06:00
probe.c PCI: Enumerate switches below PCI-to-PCIe bridges 2017-01-11 09:11:53 -06:00
proc.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
quirks.c ktime: Cleanup ktime_set() usage 2016-12-25 17:21:22 +01:00
remove.c
rom.c
search.c
setup-bus.c
setup-irq.c
setup-res.c Merge branch 'pci/host-rockchip' into next 2016-12-12 11:25:11 -06:00
slot.c
syscall.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
vc.c
vpd.c
xen-pcifront.c