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Yang Yingliang ceb56eda07 genirq/irqdesc: Don't try to remove non-existing sysfs files 
[ Upstream commit 9049e1ca41 ]

Fault injection tests trigger warnings like this:

  kernfs: can not remove 'chip_name', no directory
  WARNING: CPU: 0 PID: 253 at fs/kernfs/dir.c:1616 kernfs_remove_by_name_ns+0xce/0xe0
  RIP: 0010:kernfs_remove_by_name_ns+0xce/0xe0
  Call Trace:
   <TASK>
   remove_files.isra.1+0x3f/0xb0
   sysfs_remove_group+0x68/0xe0
   sysfs_remove_groups+0x41/0x70
   __kobject_del+0x45/0xc0
   kobject_del+0x29/0x40
   free_desc+0x42/0x70
   irq_free_descs+0x5e/0x90

The reason is that the interrupt descriptor sysfs handling does not roll
back on a failing kobject_add() during allocation. If the descriptor is
freed later on, kobject_del() is invoked with a not added kobject resulting
in the above warnings.

A proper rollback in case of a kobject_add() failure would be the straight
forward solution. But this is not possible due to the way how interrupt
descriptor sysfs handling works.

Interrupt descriptors are allocated before sysfs becomes available. So the
sysfs files for the early allocated descriptors are added later in the boot
process. At this point there can be nothing useful done about a failing
kobject_add(). For consistency the interrupt descriptor allocation always
treats kobject_add() failures as non-critical and just emits a warning.

To solve this problem, keep track in the interrupt descriptor whether
kobject_add() was successful or not and make the invocation of
kobject_del() conditional on that.

[ tglx: Massage changelog, comments and use a state bit. ]

Fixes: ecb3f394c5 ("genirq: Expose interrupt information through sysfs")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://lore.kernel.org/r/20221128151612.1786122-1-yangyingliang@huawei.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
2023-04-19 17:57:15 +08:00
arch perf/x86/intel/uncore: Fix reference count leak in __uncore_imc_init_box() 2023-04-19 17:57:14 +08:00
block block: move CONFIG_BLOCK guard to top Makefile 2023-04-19 17:57:04 +08:00
certs certs/blacklist_hashes.c: fix const confusion in certs blacklist 2023-04-19 17:50:34 +08:00
crypto crypto: akcipher - default implementation for setting a private key 2023-04-19 17:55:27 +08:00
Documentation docs: update mediator contact information in CoC doc 2023-04-19 17:56:27 +08:00
drivers EDAC/i10nm: fix refcount leak in pci_get_dev_wrapper() 2023-04-19 17:57:14 +08:00
fs nfsd: don't call nfsd_file_put from client states seqfile display 2023-04-19 17:57:15 +08:00
include timerqueue: Use rb_entry_safe() in timerqueue_getnext() 2023-04-19 17:57:13 +08:00
init init/Kconfig: fix CC_HAS_ASM_GOTO_TIED_OUTPUT test with dash 2023-04-19 17:56:40 +08:00
io_uring io_uring: Fix a null-ptr-deref in io_tctx_exit_cb() 2023-04-19 17:57:04 +08:00
ipc ipc/sem: Fix dangling sem_array access in semtimedop race 2023-04-19 17:56:54 +08:00
kernel genirq/irqdesc: Don't try to remove non-existing sysfs files 2023-04-19 17:57:15 +08:00
lib lib/fonts: fix undefined behavior in bit shift for get_default_font 2023-04-19 17:57:13 +08:00
LICENSES LICENSES/dual/CC-BY-4.0: Git rid of "smart quotes" 2021-07-15 06:31:24 -06:00
mm mm/gup: fix gup_pud_range() for dax 2023-04-19 17:56:58 +08:00
net Bluetooth: L2CAP: Fix u8 overflow 2023-04-19 17:57:06 +08:00
samples samples/landlock: Format with clang-format 2023-04-19 17:50:01 +08:00
scripts scripts/faddr2line: Fix regression in name resolution on ppc64le 2023-04-19 17:56:46 +08:00
security capabilities: fix potential memleak on error path from vfs_getxattr_alloc() 2023-04-19 17:56:03 +08:00
sound ASoC: ops: Correct bounds check for second channel on SX controls 2023-04-19 17:57:05 +08:00
tools selftests/efivarfs: Add checking of the test return value 2023-04-19 17:57:14 +08:00
usr usr/include/Makefile: add linux/nfc.h to the compile-test coverage 2023-04-19 17:44:58 +08:00
virt kvm: Add support for arch compat vm ioctls 2023-04-19 17:55:40 +08:00
.clang-format clang-format: Update with the latest for_each macro list 2021-05-12 23:32:39 +02:00
.cocciconfig
.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 io_uring: move to separate directory 2023-04-19 17:57:04 +08:00
Makefile Linux 5.15.85 2023-04-19 17:57:07 +08:00
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.