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Andrew Lunn c6fb45d895 net: dsa: mv88e6xxx: Add lockdep classes to fix false positive splat [ Upstream commit `f6d9758b12` ] The following false positive lockdep splat has been observed. ====================================================== WARNING: possible circular locking dependency detected 4.20.0+ #302 Not tainted ------------------------------------------------------ systemd-udevd/160 is trying to acquire lock: edea6080 (&chip->reg_lock){+.+.}, at: __setup_irq+0x640/0x704 but task is already holding lock: edff0340 (&desc->request_mutex){+.+.}, at: __setup_irq+0xa0/0x704 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&desc->request_mutex){+.+.}: mutex_lock_nested+0x1c/0x24 __setup_irq+0xa0/0x704 request_threaded_irq+0xd0/0x150 mv88e6xxx_probe+0x41c/0x694 [mv88e6xxx] mdio_probe+0x2c/0x54 really_probe+0x200/0x2c4 driver_probe_device+0x5c/0x174 __driver_attach+0xd8/0xdc bus_for_each_dev+0x58/0x7c bus_add_driver+0xe4/0x1f0 driver_register+0x7c/0x110 mdio_driver_register+0x24/0x58 do_one_initcall+0x74/0x2e8 do_init_module+0x60/0x1d0 load_module+0x1968/0x1ff4 sys_finit_module+0x8c/0x98 ret_fast_syscall+0x0/0x28 0xbedf2ae8 -> #0 (&chip->reg_lock){+.+.}: __mutex_lock+0x50/0x8b8 mutex_lock_nested+0x1c/0x24 __setup_irq+0x640/0x704 request_threaded_irq+0xd0/0x150 mv88e6xxx_g2_irq_setup+0xcc/0x1b4 [mv88e6xxx] mv88e6xxx_probe+0x44c/0x694 [mv88e6xxx] mdio_probe+0x2c/0x54 really_probe+0x200/0x2c4 driver_probe_device+0x5c/0x174 __driver_attach+0xd8/0xdc bus_for_each_dev+0x58/0x7c bus_add_driver+0xe4/0x1f0 driver_register+0x7c/0x110 mdio_driver_register+0x24/0x58 do_one_initcall+0x74/0x2e8 do_init_module+0x60/0x1d0 load_module+0x1968/0x1ff4 sys_finit_module+0x8c/0x98 ret_fast_syscall+0x0/0x28 0xbedf2ae8 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&desc->request_mutex); lock(&chip->reg_lock); lock(&desc->request_mutex); lock(&chip->reg_lock); &desc->request_mutex refer to two different mutex. #1 is the GPIO for the chip interrupt. #2 is the chained interrupt between global 1 and global 2. Add lockdep classes to the GPIO interrupt to avoid this. Reported-by: Russell King <rmk+kernel@armlinux.org.uk> Signed-off-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Sasha Levin <sashal@kernel.org>		2019-04-05 22:33:02 +02:00
arch	powerpc/hugetlb: Handle mmap_min_addr correctly in get_unmapped_area callback	2019-04-05 22:33:02 +02:00
block	blk-mq: insert rq with DONTPREP to hctx dispatch list when requeue	2019-03-23 20:09:45 +01:00
certs	export.h: remove VMLINUX_SYMBOL() and VMLINUX_SYMBOL_STR()	2018-08-22 23:21:44 +09:00
crypto	crypto: testmgr - skip crc32c context test for ahash algorithms	2019-03-23 20:09:55 +01:00
Documentation	KVM: Reject device ioctls from processes other than the VM's creator	2019-04-03 06:26:29 +02:00
drivers	net: dsa: mv88e6xxx: Add lockdep classes to fix false positive splat	2019-04-05 22:33:02 +02:00
firmware	kbuild: remove all dummy assignments to obj-	2017-11-18 11:46:06 +09:00
fs	btrfs: qgroup: Make qgroup async transaction commit more aggressive	2019-04-05 22:33:02 +02:00
include	f2fs: fix to check inline_xattr_size boundary correctly	2019-04-05 22:32:59 +02:00
init	Revert "mm: use early_pfn_to_nid in page_ext_init"	2019-03-23 20:09:46 +01:00
ipc	ipc/shm.c: use ERR_CAST() for shm_lock() error return	2018-10-05 16:32:04 -07:00
kernel	sysctl: handle overflow for file-max	2019-04-05 22:32:57 +02:00
lib	rhashtable: Still do rehash when we get EEXIST	2019-04-03 06:26:17 +02:00
LICENSES	LICENSES: Remove CC-BY-SA-4.0 license text	2018-10-18 11:28:50 +02:00
mm	page_poison: play nicely with KASAN	2019-04-05 22:32:59 +02:00
net	netfilter: conntrack: tcp: only close if RST matches exact sequence	2019-04-05 22:33:00 +02:00
samples	samples: mei: use /dev/mei0 instead of /dev/mei	2019-02-15 08:10:11 +01:00
scripts	kbuild: modversions: Fix relative CRC byte order interpretation	2019-04-03 06:26:23 +02:00
security	security/selinux: fix SECURITY_LSM_NATIVE_LABELS on reused superblock	2019-03-23 20:10:06 +01:00
sound	ALSA: hda/realtek - Fix speakers on Acer Predator Helios 500 Ryzen laptops	2019-04-03 06:26:23 +02:00
tools	tools lib traceevent: Fix buffer overflow in arg_eval	2019-04-05 22:33:00 +02:00
usr	initramfs: move gen_initramfs_list.sh from scripts/ to usr/	2018-08-22 23:21:44 +09:00
virt	KVM: Reject device ioctls from processes other than the VM's creator	2019-04-03 06:26:29 +02:00
.clang-format	clang-format: Set IndentWrappedFunctionNames false	2018-08-01 18:38:51 +02:00
.cocciconfig
.get_maintainer.ignore
.gitattributes	.gitattributes: set git diff driver for C source code files	2016-10-07 18:46:30 -07:00
.gitignore	Kbuild updates for v4.17 (2nd)	2018-04-15 17:21:30 -07:00
.mailmap	libnvdimm-for-4.19_misc	2018-08-25 18:13:10 -07:00
COPYING	COPYING: use the new text with points to the license files	2018-03-23 12:41:45 -06:00
CREDITS	9p: remove Ron Minnich from MAINTAINERS	2018-08-17 16:20:26 -07:00
Kbuild	Kbuild updates for v4.15	2017-11-17 17:45:29 -08:00
Kconfig	kconfig: move the "Executable file formats" menu to fs/Kconfig.binfmt	2018-08-02 08:06:55 +09:00
MAINTAINERS	MAINTAINERS: Add Sasha as a stable branch maintainer	2018-12-01 09:37:25 +01:00
Makefile	kbuild: invoke syncconfig if include/config/auto.conf.cmd is missing	2019-04-05 22:33:01 +02:00
README	Docs: Added a pointer to the formatted docs to README	2018-03-21 09:02:53 -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.
See Documentation/00-INDEX for a list of what is contained in each file.

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.