acpi_dock_ops address_space_operations backlight_ops block_device_operations clk_ops comedi_lrange component_ops dentry_operations dev_pm_ops dma_map_ops driver_info drm_connector_funcs drm_encoder_funcs drm_encoder_helper_funcs ethtool_ops extent_io_ops file_lock_operations file_operations hv_ops ide_dma_ops ide_port_ops inode_operations intel_dvo_dev_ops irq_domain_ops item_operations iwl_cfg iwl_ops kgdb_arch kgdb_io kset_uevent_ops lock_manager_operations machine_desc microcode_ops mlxsw_reg_info mtrr_ops neigh_ops net_device_ops nlmsvc_binding nvkm_device_chip of_device_id pci_raw_ops pipe_buf_operations platform_hibernation_ops platform_suspend_ops proto_ops regmap_access_table rpc_pipe_ops rtc_class_ops sd_desc seq_operations sirfsoc_padmux snd_ac97_build_ops snd_soc_component_driver soc_pcmcia_socket_ops stacktrace_ops sysfs_ops tty_operations uart_ops usb_mon_operations v4l2_ctrl_ops v4l2_ioctl_ops vm_operations_struct wacom_features wd_ops 16003f50d7e8d74b02d0a143'/> net-next plumbingsTobias Klauser
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authorBjorn Helgaas <bhelgaas@google.com>2017-01-27 15:00:45 -0600
committerBjorn Helgaas <bhelgaas@google.com>2017-01-27 15:00:45 -0600
commit030305d69fc6963c16003f50d7e8d74b02d0a143 (patch)
tree363a4e34d199178769b7e7eeb26ea2620a55847b /include/drm/drm_rect.h
parent4d191b1b63c209e37bf27938ef365244d3c41084 (diff)
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 'include/drm/drm_rect.h')