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Akash M 82f60f3600 usb: gadget: f_fs: Remove WARN_ON in functionfs_bind commit `dfc51e48bc` upstream. This commit addresses an issue related to below kernel panic where panic_on_warn is enabled. It is caused by the unnecessary use of WARN_ON in functionsfs_bind, which easily leads to the following scenarios. 1.adb_write in adbd 2. UDC write via configfs ================= ===================== ->usb_ffs_open_thread() ->UDC write ->open_functionfs() ->configfs_write_iter() ->adb_open() ->gadget_dev_desc_UDC_store() ->adb_write() ->usb_gadget_register_driver_owner ->driver_register() ->StartMonitor() ->bus_add_driver() ->adb_read() ->gadget_bind_driver() <times-out without BIND event> ->configfs_composite_bind() ->usb_add_function() ->open_functionfs() ->ffs_func_bind() ->adb_open() ->functionfs_bind() <ffs->state !=FFS_ACTIVE> The adb_open, adb_read, and adb_write operations are invoked from the daemon, but trying to bind the function is a process that is invoked by UDC write through configfs, which opens up the possibility of a race condition between the two paths. In this race scenario, the kernel panic occurs due to the WARN_ON from functionfs_bind when panic_on_warn is enabled. This commit fixes the kernel panic by removing the unnecessary WARN_ON. Kernel panic - not syncing: kernel: panic_on_warn set ... [ 14.542395] Call trace: [ 14.542464] ffs_func_bind+0x1c8/0x14a8 [ 14.542468] usb_add_function+0xcc/0x1f0 [ 14.542473] configfs_composite_bind+0x468/0x588 [ 14.542478] gadget_bind_driver+0x108/0x27c [ 14.542483] really_probe+0x190/0x374 [ 14.542488] __driver_probe_device+0xa0/0x12c [ 14.542492] driver_probe_device+0x3c/0x220 [ 14.542498] __driver_attach+0x11c/0x1fc [ 14.542502] bus_for_each_dev+0x104/0x160 [ 14.542506] driver_attach+0x24/0x34 [ 14.542510] bus_add_driver+0x154/0x270 [ 14.542514] driver_register+0x68/0x104 [ 14.542518] usb_gadget_register_driver_owner+0x48/0xf4 [ 14.542523] gadget_dev_desc_UDC_store+0xf8/0x144 [ 14.542526] configfs_write_iter+0xf0/0x138 Fixes: `ddf8abd259` ("USB: f_fs: the FunctionFS driver") Cc: stable <stable@kernel.org> Signed-off-by: Akash M <akash.m5@samsung.com> Link: https://lore.kernel.org/r/20241219125221.1679-1-akash.m5@samsung.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		History 2025-01-17 13:34:45 +01:00
arch	riscv: Fix sleeping in invalid context in die()	2025-01-17 13:34:42 +01:00
block	blk-mq: register cpuhp callback after hctx is added to xarray table	2025-01-02 10:30:52 +01:00
certs	certs: Fix build error when PKCS#11 URI contains semicolon	2023-02-09 11:28:11 +01:00
crypto	crypto: api - Add crypto_clone_tfm	2024-12-14 19:53:51 +01:00
Documentation	dt-bindings: display: adi,adv7533: Drop single lane support	2025-01-09 13:30:06 +01:00
drivers	usb: gadget: f_fs: Remove WARN_ON in functionfs_bind	2025-01-17 13:34:45 +01:00
fs	ksmbd: fix unexpectedly changed path in ksmbd_vfs_kern_path_locked	2025-01-17 13:34:41 +01:00
include	bpf: Add MEM_WRITE attribute	2025-01-17 13:34:43 +01:00
init	initramfs: avoid filename buffer overrun	2024-12-14 19:53:14 +01:00
io_uring	io_uring/sqpoll: fix sqpoll error handling races	2025-01-02 10:30:54 +01:00
ipc	ipc: fix memleak if msg_init_ns failed in create_ipc_ns	2024-12-14 19:54:06 +01:00
kernel	bpf: Fix overloading of MEM_UNINIT's meaning	2025-01-17 13:34:43 +01:00
lib	lib: stackinit: hide never-taken branch from compiler	2024-12-14 19:54:37 +01:00
LICENSES	LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers	2021-12-16 14:33:10 +01:00
mm	mm: vmscan: account for free pages to prevent infinite Loop in throttle_direct_reclaim()	2025-01-09 13:30:07 +01:00
net	bpf: Add MEM_WRITE attribute	2025-01-17 13:34:43 +01:00
rust	rust: macros: provide correct provenance when constructing THIS_MODULE	2024-10-17 15:22:24 +02:00
samples	samples/bpf: Fix a resource leak	2024-12-14 19:54:40 +01:00
scripts	scripts/sorttable: fix orc_sort_cmp() to maintain symmetry and transitivity	2025-01-17 13:34:38 +01:00
security	selinux: ignore unknown extended permissions	2025-01-09 13:29:56 +01:00
sound	ASoC: mediatek: disable buffer pre-allocation	2025-01-17 13:34:38 +01:00
tools	stddef: make __struct_group() UAPI C++-friendly	2025-01-02 10:30:51 +01:00
usr	usr/gen_init_cpio.c: remove unnecessary -1 values from int file	2022-10-03 14:21:44 -07:00
virt	KVM: Fix a data race on last_boosted_vcpu in kvm_vcpu_on_spin()	2024-06-27 13:46:21 +02:00
.clang-format	inet: ping: use hlist_nulls rcu iterator during lookup	2022-12-01 12:42:46 +01:00
.cocciconfig	scripts: add Linux .cocciconfig for coccinelle	2016-07-22 12:13:39 +02:00
.get_maintainer.ignore	get_maintainer: add Alan to .get_maintainer.ignore	2022-08-20 15:17:44 -07:00
.gitattributes	.gitattributes: use 'dts' diff driver for dts files	2019-12-04 19:44:11 -08:00
.gitignore	Remove *.orig pattern from .gitignore	2024-10-17 15:21:15 +02:00
.mailmap	9 hotfixes. 6 for MM, 3 for other areas. Four of these patches address	2022-12-10 17:10:52 -08:00
.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	MAINTAINERS: Remove Michal Marek from Kbuild maintainers	2022-11-16 14:53:00 +09:00
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	MAINTAINERS: add leah to 6.1 MAINTAINERS file	2024-05-17 11:56:16 +02:00
Makefile	Linux 6.1.124	2025-01-09 13:30:07 +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.