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Dmitry Baryshkov b70dc563b7 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>		2023-11-20 11:59:12 +01:00
arch	x86/tdx: Zero out the missing RSI in TDX_HYPERCALL macro	2023-11-20 11:59:09 +01:00
block	blk-throttle: check for overflow in calculate_bytes_allowed	2023-10-20 18:38:17 -06:00
certs	certs: Reference revocation list for all keyrings	2023-08-17 20:12:41 +00:00
crypto	KEYS: asymmetric: Fix sign/verify on pkcs1pad without a hash	2023-10-18 12:27:10 +08:00
Documentation	x86/srso: Fix vulnerability reporting for missing microcode	2023-11-20 11:58:52 +01:00
drivers	drm/bridge: lt9611uxc: fix the race in the error path	2023-11-20 11:59:12 +01:00
fs	pstore/platform: Add check for kstrdup	2023-11-20 11:58:53 +01:00
include	drm: bridge: samsung-dsim: Fix waiting for empty cmd transfer FIFO on older Exynos	2023-11-20 11:59:08 +01:00
init	workqueue: Changes for v6.6	2023-09-01 16:06:32 -07:00
io_uring	io_uring/kbuf: Allow the full buffer id space for provided buffers	2023-11-20 11:59:11 +01:00
ipc	Add x86 shadow stack support	2023-08-31 12:20:12 -07:00
kernel	bpf: Fix unnecessary -EBUSY from htab_lock_bucket	2023-11-20 11:59:03 +01:00
lib	maple_tree: add GFP_KERNEL to allocations in mas_expected_entries()	2023-10-18 12:12:41 -07:00
LICENSES	LICENSES: Add the copyleft-next-0.3.1 license	2022-11-08 15:44:01 +01:00
mm	vfs: fix readahead(2) on block devices	2023-11-20 11:58:52 +01:00
net	ipv6: avoid atomic fragment on GSO packets	2023-11-20 11:59:03 +01:00
rust	rust: docs: fix logo replacement	2023-10-19 16:40:00 +02:00
samples	VFIO updates for v6.6-rc1	2023-08-30 20:36:01 -07:00
scripts	x86/srso: Fix unret validation dependencies	2023-11-20 11:58:52 +01:00
security	KEYS: trusted: Remove redundant static calls usage	2023-10-10 11:19:43 -07:00
sound	ASoC: SOF: sof-pci-dev: Fix community key quirk detection	2023-11-08 11:56:24 +01:00
tools	selftests/bpf: Make linked_list failure test more robust	2023-11-20 11:59:01 +01:00
usr	initramfs: Encode dependency on KBUILD_BUILD_TIMESTAMP	2023-06-06 17:54:49 +09:00
virt	ARM:	2023-09-07 13:52:20 -07:00
.clang-format	iommu: Add for_each_group_device()	2023-05-23 08:15:51 +02:00
.cocciconfig
.get_maintainer.ignore	get_maintainer: add Alan to .get_maintainer.ignore	2022-08-20 15:17:44 -07:00
.gitattributes	.gitattributes: set diff driver for Rust source code files	2023-05-31 17:48:25 +02:00
.gitignore	kbuild: rpm-pkg: rename binkernel.spec to kernel.spec	2023-07-25 00:59:33 +09:00
.mailmap	20 hotfixes. 12 are cc:stable and the remainder address post-6.5 issues	2023-10-24 09:52:16 -10:00
.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: Remove Wireless USB and UWB documentation	2023-08-09 14:17:32 +02:00
Kbuild	Kbuild updates for v6.1	2022-10-10 12:00:45 -07:00
Kconfig	kbuild: ensure full rebuild when the compiler is updated	2020-05-12 13:28:33 +09:00
MAINTAINERS	Char/Misc driver fixes for 6.6-final	2023-10-28 07:51:27 -10:00
Makefile	Linux 6.6.1	2023-11-08 11:56:25 +01:00
README

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.