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Yangyu Chen a154f14160 PCI: Fix regression in pci_bus_distribute_available_resources() 
The refactoring in 4292a1e45f ("PCI: Refactor distributing available
memory to use loops") switched pci_bus_distribute_available_resources() to
operate on an array of bridge windows. That accidentally looked up bus
resources via pci_bus_resource_n() and then passed those pointers to helper
routines that expect the resource to belong to the device. As soon as we
execute that code, pci_resource_num() warned because the resource wasn't in
the bridge's resource array.

This happens on my AMD Strix Halo machine with Thunderbolt device; the
error message is shown below:

  WARNING: CPU: 6 PID: 272 at drivers/pci/pci.h:471 pci_bus_distribute_available_resources+0x6ad/0x6d0
  CPU: 6 UID: 0 PID: 272 Comm: irq/33-pciehp Not tainted 6.17.0+ #1 PREEMPT(voluntary)
  Hardware name: PELADN YO Series/YO1, BIOS 1.04 05/15/2025
  RIP: 0010:pci_bus_distribute_available_resources+0x6ad/0x6d0
  Call Trace:
   pci_bus_distribute_available_resources+0x590/0x6d0
   pci_bridge_distribute_available_resources+0x62/0xb0
   pci_assign_unassigned_bridge_resources+0x65/0x1b0
   pciehp_configure_device+0x92/0x160
   pciehp_handle_presence_or_link_change+0x1b5/0x350
   pciehp_ist+0x147/0x1c0

Fix the regression by always fetching the resource directly from the bridge
with pci_resource_n(bridge, PCI_BRIDGE_RESOURCES + i). This restores the
original behaviour while keeping the refactored structure.  Then we can
successfully assign resources to the Thunderbolt device.

Fixes: 4292a1e45f ("PCI: Refactor distributing available memory to use loops")
Reported-by: Kenneth R. Crudup <kenny@panix.com>
Closes: https://lore.kernel.org/r/dd551b81-9e81-480b-aab3-7cf8b8bbc1d0@panix.com
Signed-off-by: Yangyu Chen <cyy@cyyself.name>
[bhelgaas: trim timestamps, etc from commit log]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Tested-By: Kenneth R. Crudup <kenny@panix.com>
Link: https://lore.kernel.org/r/F833CC81-7C60-48FC-A31C-B9999DCC6FA2@icloud.com
Link: https://patch.msgid.link/tencent_8C54420E1B0FF8D804C1B4651DF970716309@qq.com
History 2025-10-08 16:36:31 -05:00
arch pci-v6.18-changes 2025-10-06 10:41:03 -07:00
block Summary of significant series in this pull request: 2025-10-02 18:18:33 -07:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto This update includes the following changes: 2025-10-04 14:59:29 -07:00
Documentation pci-v6.18-changes 2025-10-06 10:41:03 -07:00
drivers PCI: Fix regression in pci_bus_distribute_available_resources() 2025-10-08 16:36:31 -05:00
fs zonefs changes for 6.18 2025-10-05 20:45:49 -07:00
include pci-v6.18-changes 2025-10-06 10:41:03 -07:00
init printk changes for 6.18 2025-10-04 11:13:11 -07:00
io_uring Summary of significant series in this pull request: 2025-10-02 18:18:33 -07:00
ipc namespace-6.18-rc1 2025-09-29 11:20:29 -07:00
kernel tracing updates for v6.18: 2025-10-05 09:43:36 -07:00
lib integrity-v6.18 2025-10-05 10:48:33 -07:00
LICENSES LICENSES: Replace the obsolete address of the FSF in the GFDL-1.2 2025-07-24 11:15:39 +02:00
mm Only two patch series in this pull request: 2025-10-05 12:11:07 -07:00
net NFS Client Updates for Linux 6.18 2025-10-03 14:20:40 -07:00
rust Char/Misc/IIO/Binder changes for 6.18-rc1 2025-10-04 16:26:32 -07:00
samples Char/Misc/IIO/Binder changes for 6.18-rc1 2025-10-04 16:26:32 -07:00
scripts It has been a relatively busy cycle in docsland, with changes all over: 2025-10-03 17:16:13 -07:00
security integrity-v6.18 2025-10-05 10:48:33 -07:00
sound platform-drivers-x86 for v6.18-1 2025-10-04 15:28:18 -07:00
tools pci-v6.18-changes 2025-10-06 10:41:03 -07:00
usr gen_init_cpio: add -a <data_align> as reflink optimization 2025-08-20 16:02:56 -07:00
virt KVM common changes for 6.18 2025-09-30 13:27:59 -04:00
.clang-format memblock: drop for_each_free_mem_pfn_range_in_zone_from() 2025-09-14 08:49:03 +03:00
.clippy.toml rust: clean Rust 1.88.0's warning about clippy::disallowed_macros configuration 2025-05-07 00:11:47 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.editorconfig .editorconfig: remove trim_trailing_whitespace option 2024-06-13 16:47:52 +02:00
.get_maintainer.ignore MAINTAINERS: remove Alyssa Rosenzweig 2025-09-18 21:17:31 +02:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore .gitignore: ignore compile_commands.json globally 2025-08-12 15:53:55 -07:00
.mailmap VFIO updates for v6.18-rc1 2025-10-04 08:24:54 -07:00
.pylintrc tools: docs: parse-headers.py: move it from sphinx dir 2025-08-29 15:54:42 -06:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS USB/Thunderbolt changes for 6.18-rc1 2025-10-04 16:07:08 -07:00
Kbuild sched: Make migrate_{en,dis}able() inline 2025-09-25 09:57:16 +02:00
Kconfig io_uring: Rename KConfig to Kconfig 2025-02-19 14:53:27 -07:00
MAINTAINERS pci-v6.18-changes 2025-10-06 10:41:03 -07:00
Makefile It has been a relatively busy cycle in docsland, with changes all over: 2025-10-03 17:16:13 -07:00
README README: Fix spelling 2024-03-18 03:36:32 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.