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The source for the Linux kernel used in Windows Subsystem for Linux 2 (WSL2)
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Douglas Anderson a43cf6acf0 wifi: ath10k: Don't touch the CE interrupt registers after power up 
[ Upstream commit 170c75d43a77dc937c58f07ecf847ba1b42ab74e ]

As talked about in commit d66d24ac30 ("ath10k: Keep track of which
interrupts fired, don't poll them"), if we access the copy engine
register at a bad time then ath10k can go boom. However, it's not
necessarily easy to know when it's safe to access them.

The ChromeOS test labs saw a crash that looked like this at
shutdown/reboot time (on a chromeos-5.15 kernel, but likely the
problem could also reproduce upstream):

Internal error: synchronous external abort: 96000010 [#1] PREEMPT SMP
...
CPU: 4 PID: 6168 Comm: reboot Not tainted 5.15.111-lockdep-19350-g1d624fe6758f #1 010b9b233ab055c27c6dc88efb0be2f4e9e86f51
Hardware name: Google Kingoftown (DT)
...
pc : ath10k_snoc_read32+0x50/0x74 [ath10k_snoc]
lr : ath10k_snoc_read32+0x24/0x74 [ath10k_snoc]
...
Call trace:
ath10k_snoc_read32+0x50/0x74 [ath10k_snoc ...]
ath10k_ce_disable_interrupt+0x190/0x65c [ath10k_core ...]
ath10k_ce_disable_interrupts+0x8c/0x120 [ath10k_core ...]
ath10k_snoc_hif_stop+0x78/0x660 [ath10k_snoc ...]
ath10k_core_stop+0x13c/0x1ec [ath10k_core ...]
ath10k_halt+0x398/0x5b0 [ath10k_core ...]
ath10k_stop+0xfc/0x1a8 [ath10k_core ...]
drv_stop+0x148/0x6b4 [mac80211 ...]
ieee80211_stop_device+0x70/0x80 [mac80211 ...]
ieee80211_do_stop+0x10d8/0x15b0 [mac80211 ...]
ieee80211_stop+0x144/0x1a0 [mac80211 ...]
__dev_close_many+0x1e8/0x2c0
dev_close_many+0x198/0x33c
dev_close+0x140/0x210
cfg80211_shutdown_all_interfaces+0xc8/0x1e0 [cfg80211 ...]
ieee80211_remove_interfaces+0x118/0x5c4 [mac80211 ...]
ieee80211_unregister_hw+0x64/0x1f4 [mac80211 ...]
ath10k_mac_unregister+0x4c/0xf0 [ath10k_core ...]
ath10k_core_unregister+0x80/0xb0 [ath10k_core ...]
ath10k_snoc_free_resources+0xb8/0x1ec [ath10k_snoc ...]
ath10k_snoc_shutdown+0x98/0xd0 [ath10k_snoc ...]
platform_shutdown+0x7c/0xa0
device_shutdown+0x3e0/0x58c
kernel_restart_prepare+0x68/0xa0
kernel_restart+0x28/0x7c

Though there's no known way to reproduce the problem, it makes sense
that it would be the same issue where we're trying to access copy
engine registers when it's not allowed.

Let's fix this by changing how we "disable" the interrupts. Instead of
tweaking the copy engine registers we'll just use disable_irq() and
enable_irq(). Then we'll configure the interrupts once at power up
time.

Tested-on: WCN3990 hw1.0 SNOC WLAN.HL.3.2.2.c10-00754-QCAHLSWMTPL-1

Signed-off-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://lore.kernel.org/r/20230630151842.1.If764ede23c4e09a43a842771c2ddf99608f25f8e@changeid
Signed-off-by: Sasha Levin <sashal@kernel.org>
 		2023-11-28 16:56:16 +00:00
Documentation Documentation: sysctl: align cells in second content column 2023-10-25 11:58:54 +02:00
LICENSES LICENSES/dual/CC-BY-4.0: Git rid of "smart quotes" 2021-07-15 06:31:24 -06:00
arch x86/mm: Drop the 4 MB restriction on minimal NUMA node memory size 2023-11-28 16:56:15 +00:00
block blk-core: use pr_warn_ratelimited() in bio_check_ro() 2023-11-20 11:08:29 +01:00
certs certs/blacklist_hashes.c: fix const confusion in certs blacklist 2022-06-22 14:22:01 +02:00
crypto crypto: lrw,xts - Replace strlcpy with strscpy 2023-09-23 11:09:55 +02:00
drivers wifi: ath10k: Don't touch the CE interrupt registers after power up 2023-11-28 16:56:16 +00:00
fs btrfs: use u64 for buffer sizes in the tree search ioctls 2023-11-20 11:08:30 +01:00
include net: annotate data-races around sk->sk_dst_pending_confirm 2023-11-28 16:56:16 +00:00
init x86/mm: Initialize text poking earlier 2023-08-08 19:58:33 +02:00
io_uring io_uring/fs: remove sqe->rw_flags checking from LINKAT 2023-10-06 13:18:22 +02:00
ipc ipc/sem: Fix dangling sem_array access in semtimedop race 2022-12-08 11:28:45 +01:00
kernel bpf: Detect IP == ksym.end as part of BPF program 2023-11-28 16:56:15 +00:00
lib lib/Kconfig.debug: do not enable DEBUG_PREEMPT by default 2023-10-25 11:58:54 +02:00
mm vfs: fix readahead(2) on block devices 2023-11-20 11:08:13 +01:00
net net: annotate data-races around sk->sk_dst_pending_confirm 2023-11-28 16:56:16 +00:00
samples samples/hw_breakpoint: fix building without module unloading 2023-09-23 11:10:01 +02:00
scripts modpost: fix tee MODULE_DEVICE_TABLE built on big-endian host 2023-11-20 11:08:26 +01:00
security KEYS: trusted: Remove redundant static calls usage 2023-10-19 23:05:33 +02:00
sound ASoC: hdmi-codec: register hpd callback on component probe 2023-11-20 11:08:30 +01:00
tools selftests: pmtu.sh: fix result checking 2023-11-20 11:08:29 +01:00
usr usr/include/Makefile: add linux/nfc.h to the compile-test coverage 2022-02-01 17:27:15 +01:00
virt KVM: Grab a reference to KVM for VM and vCPU stats file descriptors 2023-08-03 10:22:40 +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 iio: stx104: Move to addac subdirectory 2023-08-26 14:23:27 +02:00
Makefile Linux 5.15.139 2023-11-20 11:08:30 +01:00
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.