#include #include #include #include "notifier-error-inject.h" static int priority; module_param(priority, int, 0); MODULE_PARM_DESC(priority, "specify OF reconfig notifier priority"); static struct notifier_err_inject reconfig_err_inject = { .actions = { { NOTIFIER_ERR_INJECT_ACTION(OF_RECONFIG_ATTACH_NODE) }, { NOTIFIER_ERR_INJECT_ACTION(OF_RECONFIG_DETACH_NODE) }, { NOTIFIER_ERR_INJECT_ACTION(OF_RECONFIG_ADD_PROPERTY) }, { NOTIFIER_ERR_INJECT_ACTION(OF_RECONFIG_REMOVE_PROPERTY) }, { NOTIFIER_ERR_INJECT_ACTION(OF_RECONFIG_UPDATE_PROPERTY) }, {} } }; static struct dentry *dir; static int err_inject_init(void) { int err; dir = notifier_err_inject_init("OF-reconfig", notifier_err_inject_dir, &reconfig_err_inject, priority); if (IS_ERR(dir)) return PTR_ERR(dir); err = of_reconfig_notifier_register(&reconfig_err_inject.nb); if (err) debugfs_remove_recursive(dir); return err; } static void err_inject_exit(void) { of_reconfig_notifier_unregister(&reconfig_err_inject.nb); debugfs_remove_recursive(dir); } module_init(err_inject_init); module_exit(err_inject_exit); MODULE_DESCRIPTION("OF reconfig notifier error injection module"); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Akinobu Mita "); k 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 /net/unix/Makefile
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+
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