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The source for the Linux kernel used in Windows Subsystem for Linux 2 (WSL2)
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Jarkko Nikula 7fa5304c4b i2c: designware: Fix handling of real but unexpected device interrupts 
commit 301c8f5c32 upstream.

Commit c7b79a7528 ("mfd: intel-lpss: Add Intel Alder Lake PCH-S PCI
IDs") caused a regression on certain Gigabyte motherboards for Intel
Alder Lake-S where system crashes to NULL pointer dereference in
i2c_dw_xfer_msg() when system resumes from S3 sleep state ("deep").

I was able to debug the issue on Gigabyte Z690 AORUS ELITE and made
following notes:

- Issue happens when resuming from S3 but not when resuming from
  "s2idle"
- PCI device 00:15.0 == i2c_designware.0 is already in D0 state when
  system enters into pci_pm_resume_noirq() while all other i2c_designware
  PCI devices are in D3. Devices were runtime suspended and in D3 prior
  entering into suspend
- Interrupt comes after pci_pm_resume_noirq() when device interrupts are
  re-enabled
- According to register dump the interrupt really comes from the
  i2c_designware.0. Controller is enabled, I2C target address register
  points to a one detectable I2C device address 0x60 and the
  DW_IC_RAW_INTR_STAT register START_DET, STOP_DET, ACTIVITY and
  TX_EMPTY bits are set indicating completed I2C transaction.

My guess is that the firmware uses this controller to communicate with
an on-board I2C device during resume but does not disable the controller
before giving control to an operating system.

I was told the UEFI update fixes this but never the less it revealed the
driver is not ready to handle TX_EMPTY (or RX_FULL) interrupt when device
is supposed to be idle and state variables are not set (especially the
dev->msgs pointer which may point to NULL or stale old data).

Introduce a new software status flag STATUS_ACTIVE indicating when the
controller is active in driver point of view. Now treat all interrupts
that occur when is not set as unexpected and mask all interrupts from
the controller.

Fixes: c7b79a7528 ("mfd: intel-lpss: Add Intel Alder Lake PCH-S PCI IDs")
Reported-by: Samuel Clark <slc2015@gmail.com>
Link: https://bugzilla.kernel.org/show_bug.cgi?id=215907
Cc: stable@vger.kernel.org # v5.12+
Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2022-10-26 12:34:20 +02:00
Documentation ARM: dts: fix Moxa SDIO 'compatible', remove 'sdhci' misnomer 2022-10-12 09:53:27 +02:00
LICENSES LICENSES/dual/CC-BY-4.0: Git rid of "smart quotes" 2021-07-15 06:31:24 -06:00
arch Revert "powerpc/rtas: Implement reentrant rtas call" 2022-10-15 07:59:02 +02:00
block block: blk_queue_enter() / __bio_queue_enter() must return -EAGAIN for nowait 2022-09-23 14:15:48 +02:00
certs certs/blacklist_hashes.c: fix const confusion in certs blacklist 2022-06-22 14:22:01 +02:00
crypto KEYS: asymmetric: enforce SM2 signature use pkey algo 2022-08-17 14:24:28 +02:00
drivers i2c: designware: Fix handling of real but unexpected device interrupts 2022-10-26 12:34:20 +02:00
fs cifs: Fix the error length of VALIDATE_NEGOTIATE_INFO message 2022-10-26 12:34:19 +02:00
include scsi: stex: Properly zero out the passthrough command structure 2022-10-15 07:59:01 +02:00
init stack: Declare {randomize_,}kstack_offset to fix Sparse warnings 2022-08-17 14:23:10 +02:00
ipc ipc/mqueue: use get_tree_nodev() in mqueue_get_tree() 2022-06-09 10:23:10 +02:00
kernel swiotlb: max mapping size takes min align mask into account 2022-10-05 10:39:40 +02:00
lib crypto: lib - remove unneeded selection of XOR_BLOCKS 2022-09-05 10:30:03 +02:00
mm mm/huge_memory: use pfn_to_online_page() in split_huge_pages_all() 2022-10-12 09:53:28 +02:00
net wifi: mac80211: fix MBSSID parsing use-after-free 2022-10-15 07:59:05 +02:00
samples samples/landlock: Format with clang-format 2022-06-09 10:23:23 +02:00
scripts Makefile.extrawarn: Move -Wcast-function-type-strict to W=1 2022-10-12 09:53:26 +02:00
security efi: Correct Macmini DMI match in uefi cert quirk 2022-10-15 07:59:01 +02:00
sound ALSA: hda/realtek: Add Intel Reference SSID to support headset keys 2022-10-26 12:34:18 +02:00
tools perf parse-events: Identify broken modifiers 2022-10-12 09:53:28 +02:00
usr usr/include/Makefile: add linux/nfc.h to the compile-test coverage 2022-02-01 17:27:15 +01:00
virt KVM: SEV: add cache flush to solve SEV cache incoherency issues 2022-09-23 14:15:52 +02:00
.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: add Andrej Shadura 2021-10-18 20:22:03 -10:00
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 Input: goodix - add a goodix.h header file 2022-07-12 16:34:51 +02:00
Makefile Linux 5.15.74 2022-10-15 07:59:05 +02:00
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.