/* * INET An implementation of the TCP/IP protocol suite for the LINUX * operating system. INET is implemented using the BSD Socket * interface as the means of communication with the user level. * * INET protocol dispatch tables. * * Authors: Ross Biro * Fred N. van Kempen, * * Fixes: * Alan Cox : Ahah! udp icmp errors don't work because * udp_err is never called! * Alan Cox : Added new fields for init and ready for * proper fragmentation (_NO_ 4K limits!) * Richard Colella : Hang on hash collision * Vince Laviano : Modified inet_del_protocol() to correctly * maintain copy bit. * * 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; either version * 2 of the License, or (at your option) any later version. */ #include #include #include #include #include const struct net_protocol __rcu *inet_protos[MAX_INET_PROTOS] __read_mostly; const struct net_offload __rcu *inet_offloads[MAX_INET_PROTOS] __read_mostly; EXPORT_SYMBOL(inet_offloads); int inet_add_protocol(const struct net_protocol *prot, unsigned char protocol) { if (!prot->netns_ok) { pr_err("Protocol %u is not namespace aware, cannot register.\n", protocol); return -EINVAL; } return !cmpxchg((const struct net_protocol **)&inet_protos[protocol], NULL, prot) ? 0 : -1; } EXPORT_SYMBOL(inet_add_protocol); int inet_add_offload(const struct net_offload *prot, unsigned char protocol) { return !cmpxchg((const struct net_offload **)&inet_offloads[protocol], NULL, prot) ? 0 : -1; } EXPORT_SYMBOL(inet_add_offload); int inet_del_protocol(const struct net_protocol *prot, unsigned char protocol) { int ret; ret = (cmpxchg((const struct net_protocol **)&inet_protos[protocol], prot, NULL) == prot) ? 0 : -1; synchronize_net(); return ret; } EXPORT_SYMBOL(inet_del_protocol); int inet_del_offload(const struct net_offload *prot, unsigned char protocol) { int ret; ret = (cmpxchg((const struct net_offload **)&inet_offloads[protocol], prot, NULL) == prot) ? 0 : -1; synchronize_net(); return ret; } EXPORT_SYMBOL(inet_del_offload); 3f50d7e8d74b02d0a143'/>
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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 /tools/perf/arch/xtensa
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 'tools/perf/arch/xtensa')