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Dmitry Baryshkov d0d01bb4a5 drm/bridge: lt9611uxc: fix the race in the error path 
[ Upstream commit 15fe53be46 ]

If DSI host attachment fails, the LT9611UXC driver will remove the
bridge without ensuring that there is no outstanding HPD work being
done. In rare cases this can result in the warnings regarding the mutex
being incorrect. Fix this by forcebly freing IRQ and flushing the work.

DEBUG_LOCKS_WARN_ON(lock->magic != lock)
WARNING: CPU: 0 PID: 10 at kernel/locking/mutex.c:582 __mutex_lock+0x468/0x77c
Modules linked in:
CPU: 0 PID: 10 Comm: kworker/0:1 Tainted: G     U             6.6.0-rc5-next-20231011-gd81f81c2b682-dirty #1206
Hardware name: Qualcomm Technologies, Inc. Robotics RB5 (DT)
Workqueue: events lt9611uxc_hpd_work
pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : __mutex_lock+0x468/0x77c
lr : __mutex_lock+0x468/0x77c
sp : ffff8000800a3c70
x29: ffff8000800a3c70 x28: 0000000000000000 x27: ffffd595fe333000
x26: ffff7c2f0002c005 x25: ffffd595ff1b3000 x24: ffffd595fccda5a0
x23: 0000000000000000 x22: 0000000000000002 x21: ffff7c2f056d91c8
x20: 0000000000000000 x19: ffff7c2f056d91c8 x18: fffffffffffe8db0
x17: 000000040044ffff x16: 005000f2b5503510 x15: 0000000000000000
x14: 000000000006efb8 x13: 0000000000000000 x12: 0000000000000037
x11: 0000000000000001 x10: 0000000000001470 x9 : ffff8000800a3ae0
x8 : ffff7c2f0027f8d0 x7 : ffff7c2f0027e400 x6 : ffffd595fc702b54
x5 : 0000000000000000 x4 : ffff8000800a0000 x3 : 0000000000000000
x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff7c2f0027e400
Call trace:
 __mutex_lock+0x468/0x77c
 mutex_lock_nested+0x24/0x30
 drm_bridge_hpd_notify+0x2c/0x5c
 lt9611uxc_hpd_work+0x6c/0x80
 process_one_work+0x1ec/0x51c
 worker_thread+0x1ec/0x3e4
 kthread+0x120/0x124
 ret_from_fork+0x10/0x20
irq event stamp: 15799
hardirqs last  enabled at (15799): [<ffffd595fc702ba4>] finish_task_switch.isra.0+0xa8/0x278
hardirqs last disabled at (15798): [<ffffd595fd5a1580>] __schedule+0x7b8/0xbd8
softirqs last  enabled at (15794): [<ffffd595fc690698>] __do_softirq+0x498/0x4e0
softirqs last disabled at (15771): [<ffffd595fc69615c>] ____do_softirq+0x10/0x1c

Fixes: bc6fa8676e ("drm/bridge/lontium-lt9611uxc: move HPD notification out of IRQ handler")
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Robert Foss <rfoss@kernel.org>
Signed-off-by: Robert Foss <rfoss@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20231011220002.382422-1-dmitry.baryshkov@linaro.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2023-11-20 11:08:20 +01:00
arch x86/boot: Fix incorrect startup_gdt_descr.size 2023-11-20 11:08:13 +01:00
block block: fix use-after-free of q->q_usage_counter 2023-10-10 21:59:05 +02:00
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
Documentation Documentation: sysctl: align cells in second content column 2023-10-25 11:58:54 +02:00
drivers drm/bridge: lt9611uxc: fix the race in the error path 2023-11-20 11:08:20 +01:00
fs pstore/platform: Add check for kstrdup 2023-11-20 11:08:13 +01:00
include drm/mipi-dsi: Create devm device attachment 2023-11-20 11:08:19 +01:00
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 genirq/matrix: Exclude managed interrupts in irq_matrix_allocated() 2023-11-20 11:08:13 +01:00
lib lib/Kconfig.debug: do not enable DEBUG_PREEMPT by default 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
mm vfs: fix readahead(2) on block devices 2023-11-20 11:08:13 +01:00
net ipv6: avoid atomic fragment on GSO packets 2023-11-20 11:08:16 +01:00
samples samples/hw_breakpoint: fix building without module unloading 2023-09-23 11:10:01 +02:00
scripts modpost: add missing else to the "of" check 2023-10-10 21:59:07 +02:00
security KEYS: trusted: Remove redundant static calls usage 2023-10-19 23:05:33 +02:00
sound ALSA: hda: intel-dsp-config: Fix JSL Chromebook quirk detection 2023-11-08 17:26:51 +01:00
tools selftests/bpf: Correct map_fd to data_fd in tailcalls 2023-11-20 11:08:14 +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 5.15.138 2023-11-08 17:26:52 +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.