/* * debug.h - NTFS kernel debug support. Part of the Linux-NTFS project. * * Copyright (c) 2001-2004 Anton Altaparmakov * * This program/include file 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. * * This program/include file 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 (in the main directory of the Linux-NTFS * distribution in the file COPYING); if not, write to the Free Software * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #ifndef _LINUX_NTFS_DEBUG_H #define _LINUX_NTFS_DEBUG_H #include #include "runlist.h" #ifdef DEBUG extern int debug_msgs; extern __printf(4, 5) void __ntfs_debug(const char *file, int line, const char *function, const char *format, ...); /** * ntfs_debug - write a debug level message to syslog * @f: a printf format string containing the message * @...: the variables to substitute into @f * * ntfs_debug() writes a DEBUG level message to the syslog but only if the * driver was compiled with -DDEBUG. Otherwise, the call turns into a NOP. */ #define ntfs_debug(f, a...) \ __ntfs_debug(__FILE__, __LINE__, __func__, f, ##a) extern void ntfs_debug_dump_runlist(const runlist_element *rl); #else /* !DEBUG */ #define ntfs_debug(fmt, ...) \ do { \ if (0) \ no_printk(fmt, ##__VA_ARGS__); \ } while (0) #define ntfs_debug_dump_runlist(rl) do {} while (0) #endif /* !DEBUG */ extern __printf(3, 4) void __ntfs_warning(const char *function, const struct super_block *sb, const char *fmt, ...); #define ntfs_warning(sb, f, a...) __ntfs_warning(__func__, sb, f, ##a) extern __printf(3, 4) void __ntfs_error(const char *function, const struct super_block *sb, const char *fmt, ...); #define ntfs_error(sb, f, a...) __ntfs_error(__func__, sb, f, ##a) #endif /* _LINUX_NTFS_DEBUG_H */ a143'/>
path: root/net/9p/error.c
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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 /net/9p/error.c
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/9p/error.c')