/* * net/tipc/core.c: TIPC module code * * Copyright (c) 2003-2006, 2013, Ericsson AB * Copyright (c) 2005-2006, 2010-2013, Wind River Systems * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the names of the copyright holders nor the names of its * contributors may be used to endorse or promote products derived from * this software without specific prior written permission. * * Alternatively, this software may be distributed under the terms of the * GNU General Public License ("GPL") version 2 as published by the Free * Software Foundation. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include "core.h" #include "name_table.h" #include "subscr.h" #include "bearer.h" #include "net.h" #include "socket.h" #include "bcast.h" #include /* configurable TIPC parameters */ unsigned int tipc_net_id __read_mostly; int sysctl_tipc_rmem[3] __read_mostly; /* min/default/max */ static int __net_init tipc_init_net(struct net *net) { struct tipc_net *tn = net_generic(net, tipc_net_id); int err; tn->net_id = 4711; tn->own_addr = 0; tn->mon_threshold = TIPC_DEF_MON_THRESHOLD; get_random_bytes(&tn->random, sizeof(int)); INIT_LIST_HEAD(&tn->node_list); spin_lock_init(&tn->node_list_lock); err = tipc_sk_rht_init(net); if (err) goto out_sk_rht; err = tipc_nametbl_init(net); if (err) goto out_nametbl; INIT_LIST_HEAD(&tn->dist_queue); err = tipc_topsrv_start(net); if (err) goto out_subscr; err = tipc_bcast_init(net); if (err) goto out_bclink; return 0; out_bclink: tipc_bcast_stop(net); out_subscr: tipc_nametbl_stop(net); out_nametbl: tipc_sk_rht_destroy(net); out_sk_rht: return err; } static void __net_exit tipc_exit_net(struct net *net) { tipc_topsrv_stop(net); tipc_net_stop(net); tipc_bcast_stop(net); tipc_nametbl_stop(net); tipc_sk_rht_destroy(net); } static struct pernet_operations tipc_net_ops = { .init = tipc_init_net, .exit = tipc_exit_net, .id = &tipc_net_id, .size = sizeof(struct tipc_net), }; static int __init tipc_init(void) { int err; pr_info("Activated (version " TIPC_MOD_VER ")\n"); sysctl_tipc_rmem[0] = RCVBUF_MIN; sysctl_tipc_rmem[1] = RCVBUF_DEF; sysctl_tipc_rmem[2] = RCVBUF_MAX; err = tipc_netlink_start(); if (err) goto out_netlink; err = tipc_netlink_compat_start(); if (err) goto out_netlink_compat; err = tipc_socket_init(); if (err) goto out_socket; err = tipc_register_sysctl(); if (err) goto out_sysctl; err = register_pernet_subsys(&tipc_net_ops); if (err) goto out_pernet; err = tipc_bearer_setup(); if (err) goto out_bearer; pr_info("Started in single node mode\n"); return 0; out_bearer: unregister_pernet_subsys(&tipc_net_ops); out_pernet: tipc_unregister_sysctl(); out_sysctl: tipc_socket_stop(); out_socket: tipc_netlink_compat_stop(); out_netlink_compat: tipc_netlink_stop(); out_netlink: pr_err("Unable to start in single node mode\n"); return err; } static void __exit tipc_exit(void) { tipc_bearer_cleanup(); unregister_pernet_subsys(&tipc_net_ops); tipc_netlink_stop(); tipc_netlink_compat_stop(); tipc_socket_stop(); tipc_unregister_sysctl(); pr_info("Deactivated\n"); } module_init(tipc_init); module_exit(tipc_exit); MODULE_DESCRIPTION("TIPC: Transparent Inter Process Communication"); MODULE_LICENSE("Dual BSD/GPL"); MODULE_VERSION(TIPC_MOD_VER); td colspan='2' class='oid'>030305d69fc6963c16003f50d7e8d74b02d0a143 (patch) tree363a4e34d199178769b7e7eeb26ea2620a55847b /net/6lowpan 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 'net/6lowpan')