/* * Simple stack backtrace regression test module * * (C) Copyright 2008 Intel Corporation * Author: Arjan van de Ven * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; version 2 * of the License. */ #include #include #include #include #include #include static void backtrace_test_normal(void) { pr_info("Testing a backtrace from process context.\n"); pr_info("The following trace is a kernel self test and not a bug!\n"); dump_stack(); } static DECLARE_COMPLETION(backtrace_work); static void backtrace_test_irq_callback(unsigned long data) { dump_stack(); complete(&backtrace_work); } static DECLARE_TASKLET(backtrace_tasklet, &backtrace_test_irq_callback, 0); static void backtrace_test_irq(void) { pr_info("Testing a backtrace from irq context.\n"); pr_info("The following trace is a kernel self test and not a bug!\n"); init_completion(&backtrace_work); tasklet_schedule(&backtrace_tasklet); wait_for_completion(&backtrace_work); } #ifdef CONFIG_STACKTRACE static void backtrace_test_saved(void) { struct stack_trace trace; unsigned long entries[8]; pr_info("Testing a saved backtrace.\n"); pr_info("The following trace is a kernel self test and not a bug!\n"); trace.nr_entries = 0; trace.max_entries = ARRAY_SIZE(entries); trace.entries = entries; trace.skip = 0; save_stack_trace(&trace); print_stack_trace(&trace, 0); } #else static void backtrace_test_saved(void) { pr_info("Saved backtrace test skipped.\n"); } #endif static int backtrace_regression_test(void) { pr_info("====[ backtrace testing ]===========\n"); backtrace_test_normal(); backtrace_test_irq(); backtrace_test_saved(); pr_info("====[ end of backtrace testing ]====\n"); return 0; } static void exitf(void) { } module_init(backtrace_regression_test); module_exit(exitf); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Arjan van de Ven "); 030305d69fc6963c16003f50d7e8d74b02d0a143'>diff
path: root/include/net/bluetooth/l2cap.h
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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/net/bluetooth/l2cap.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/net/bluetooth/l2cap.h')