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Sudeep Holla 9a3b8655db ACPICA: Fix wrong interpretation of PCC address 
ACPICA commit 41be6afacfdaec2dba3a5ed368736babc2a7aa5c

With the PCC Opregion in the firmware and we are hitting below kernel crash:

-->8
Unable to handle kernel NULL pointer dereference at virtual address 0000000000000010
 Workqueue: pm pm_runtime_work
 pstate: 80000005 (Nzcv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
 pc : __memcpy+0x54/0x260
 lr : acpi_ex_write_data_to_field+0xb8/0x194
 Call trace:
  __memcpy+0x54/0x260
  acpi_ex_store_object_to_node+0xa4/0x1d4
  acpi_ex_store+0x44/0x164
  acpi_ex_opcode_1A_1T_1R+0x25c/0x508
  acpi_ds_exec_end_op+0x1b4/0x44c
  acpi_ps_parse_loop+0x3a8/0x614
  acpi_ps_parse_aml+0x90/0x2f4
  acpi_ps_execute_method+0x11c/0x19c
  acpi_ns_evaluate+0x1ec/0x2b0
  acpi_evaluate_object+0x170/0x2b0
  acpi_device_set_power+0x118/0x310
  acpi_dev_suspend+0xd4/0x180
  acpi_subsys_runtime_suspend+0x28/0x38
  __rpm_callback+0x74/0x328
  rpm_suspend+0x2d8/0x624
  pm_runtime_work+0xa4/0xb8
  process_one_work+0x194/0x25c
  worker_thread+0x260/0x49c
  kthread+0x14c/0x30c
  ret_from_fork+0x10/0x20
 Code: f9000006 f81f80a7 d65f03c0 361000c2 (b9400026)
 ---[ end trace 24d8a032fa77b68a ]---

The reason for the crash is that the PCC channel index passed via region.address
in acpi_ex_store_object_to_node is interpreted as the channel subtype
incorrectly.

Assuming the PCC op_region support is not used by any other type, let us
remove the subtype check as the AML has no access to the subtype information.
Once we remove it, the kernel crash disappears and correctly complains about
missing PCC Opregion handler.

ACPI Error: No handler for Region [PFRM] ((____ptrval____)) [PCC] (20210730/evregion-130)
ACPI Error: Region PCC (ID=10) has no handler (20210730/exfldio-261)
ACPI Error: Aborting method \_SB.ETH0._PS3 due to previous error (AE_NOT_EXIST) (20210730/psparse-531)

Link: https://github.com/acpica/acpica/commit/41be6afa
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2021-12-27 17:01:28 +01:00
arch - Prevent potential undefined behavior due to shifting pkey constants into the sign bit 2021-12-26 10:28:55 -08:00
block block-5.16-2021-12-19 2021-12-19 12:38:53 -08:00
certs certs: Add support for using elliptic curve keys for signing modules 2021-08-23 19:55:42 +03:00
crypto Update to zstd-1.4.10 2021-11-13 15:32:30 -08:00
Documentation Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2021-12-25 13:00:14 -08:00
drivers ACPICA: Fix wrong interpretation of PCC address 2021-12-27 17:01:28 +01:00
fs three ksmbd fixes, all for stable as well. Two fix potential unitialized memory and one fixes a security problem where encryption is unitentionally disabled from some clients 2021-12-23 17:15:23 -08:00
include ACPICA: Fix AEST Processor generic resource substructure data field byte length 2021-12-27 17:01:28 +01:00
init kbuild: Fix -Wimplicit-fallthrough=5 error for GCC 5.x and 6.x 2021-11-14 18:59:49 -08:00
ipc shm: extend forced shm destroy to support objects from several IPC nses 2021-11-20 10:35:54 -08:00
kernel Merge branch 'akpm' (patches from Andrew) 2021-12-25 12:30:03 -08:00
lib Merge https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf 2021-12-08 16:06:44 -08:00
LICENSES LICENSES/dual/CC-BY-4.0: Git rid of "smart quotes" 2021-07-15 06:31:24 -06:00
mm mm/hwpoison: clear MF_COUNT_INCREASED before retrying get_any_page() 2021-12-25 12:20:56 -08:00
net net: bridge: fix ioctl old_deviceless bridge argument 2021-12-23 09:53:50 -08:00
samples ftrace/samples: Add module to test multi direct modify interface 2021-12-09 13:02:44 -05:00
scripts recordmcount.pl: look for jgnop instruction as well as bcrl on s390 2021-12-12 18:52:26 +01:00
security Two overhead reduction patches for testing/fuzzing environment. 2021-12-22 10:06:32 -08:00
sound sound fixes for 5.16-rc7 2021-12-23 09:55:58 -08:00
tools * Fix for compilation of selftests on non-x86 architectures 2021-12-21 12:25:57 -08:00
usr initramfs: Check timestamp to prevent broken cpio archive 2021-10-24 13:48:40 +09:00
virt KVM: downgrade two BUG_ONs to WARN_ON_ONCE 2021-11-26 06:43:28 -05:00
.clang-format clang-format: Update with the latest for_each macro list 2021-05-12 23:32:39 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore Opt out of scripts/get_maintainer.pl 2019-05-16 10:53:40 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore .gitignore: ignore only top-level modules.builtin 2021-05-02 00:43:35 +09:00
.mailmap mailmap: update email address for Guo Ren 2021-12-10 17:10:55 -08:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Move Daniel Drake to credits 2021-09-21 08:34:58 +03:00
Kbuild kbuild: rename hostprogs-y/always to hostprogs/always-y 2020-02-04 01:53:07 +09:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS MAINTAINERS: mark more list instances as moderated 2021-12-25 12:20:55 -08:00
Makefile Linux 5.16-rc7 2021-12-26 13:17:17 -08:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -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 Restructured Text 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.