/****************************************************************************** AudioScience HPI driver Copyright (C) 1997-2011 AudioScience Inc. This program is free software; you can redistribute it and/or modify it under the terms of version 2 of the GNU General Public License as published by the Free Software Foundation; This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA Hardware Programming Interface (HPI) Utility functions (C) Copyright AudioScience Inc. 2007 *******************************************************************************/ /* Initialise response headers, or msg/response pairs. Note that it is valid to just init a response e.g. when a lower level is preparing a response to a message. However, when sending a message, a matching response buffer must always be prepared. */ #ifndef _HPIMSGINIT_H_ #define _HPIMSGINIT_H_ void hpi_init_response(struct hpi_response *phr, u16 object, u16 function, u16 error); void hpi_init_message_response(struct hpi_message *phm, struct hpi_response *phr, u16 object, u16 function); void hpi_init_responseV1(struct hpi_response_header *phr, u16 size, u16 object, u16 function); void hpi_init_message_responseV1(struct hpi_message_header *phm, u16 msg_size, struct hpi_response_header *phr, u16 res_size, u16 object, u16 function); #endif /* _HPIMSGINIT_H_ */ ef='/cgit.cgi/linux/net-next.git/tree/tools/perf/Documentation/examples.txt?id=030305d69fc6963c16003f50d7e8d74b02d0a143'>treecommitdiff
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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/Documentation/examples.txt
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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