/********************************************************************* * * Filename: crc.h * Version: * Description: CRC routines * Status: Experimental. * Author: Dag Brattli * Created at: Mon Aug 4 20:40:53 1997 * Modified at: Sun May 2 20:25:23 1999 * Modified by: Dag Brattli * ********************************************************************/ #ifndef IRDA_CRC_H #define IRDA_CRC_H #include #include #define INIT_FCS 0xffff /* Initial FCS value */ #define GOOD_FCS 0xf0b8 /* Good final FCS value */ /* Recompute the FCS with one more character appended. */ #define irda_fcs(fcs, c) crc_ccitt_byte(fcs, c) /* Recompute the FCS with len bytes appended. */ #define irda_calc_crc16(fcs, buf, len) crc_ccitt(fcs, buf, len) #endif .git/'>net-next.git
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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/acpi/apei.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/acpi/apei.h')