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Vladimir Oltean 3c7d63cfa1 net: dcb: disable softirqs in dcbnl_flush_dev() commit 10b6bb62ae1a49ee818fc479cf57b8900176773e upstream. Ido Schimmel points out that since commit `52cff74eef` ("dcbnl : Disable software interrupts before taking dcb_lock"), the DCB API can be called by drivers from softirq context. One such in-tree example is the chelsio cxgb4 driver: dcb_rpl -> cxgb4_dcb_handle_fw_update -> dcb_ieee_setapp If the firmware for this driver happened to send an event which resulted in a call to dcb_ieee_setapp() at the exact same time as another DCB-enabled interface was unregistering on the same CPU, the softirq would deadlock, because the interrupted process was already holding the dcb_lock in dcbnl_flush_dev(). Fix this unlikely event by using spin_lock_bh() in dcbnl_flush_dev() as in the rest of the dcbnl code. Fixes: 91b0383fef06 ("net: dcb: flush lingering app table entries for unregistered devices") Reported-by: Ido Schimmel <idosch@idosch.org> Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Link: https://lore.kernel.org/r/20220302193939.1368823-1-vladimir.oltean@nxp.com Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2022-03-08 19:07:51 +01:00
Documentation	bpf: Add kconfig knob for disabling unpriv bpf by default	2022-02-16 12:52:49 +01:00
LICENSES	…
arch	ARM: 9182/1: mmu: fix returns from early_param() and __setup() functions	2022-03-08 19:07:49 +01:00
block	block: Fix fsync always failed if once failed	2022-03-08 19:07:47 +01:00
certs	…
crypto	crypto: pcrypt - Delay write to padata->info	2021-11-17 09:48:40 +01:00
drivers	HID: add mapping for KEY_ALL_APPLICATIONS	2022-03-08 19:07:50 +01:00
fs	btrfs: add missing run of delayed items after unlink during log replay	2022-03-08 19:07:50 +01:00
include	Revert "xfrm: xfrm_state_mtu should return at least 1280 for ipv6"	2022-03-08 19:07:50 +01:00
init	bpf: Add kconfig knob for disabling unpriv bpf by default	2022-02-16 12:52:49 +01:00
ipc	shm: extend forced shm destroy to support objects from several IPC nses	2021-12-01 09:23:35 +01:00
kernel	tracing: Fix return value of __setup handlers	2022-03-08 19:07:50 +01:00
lib	lib/iov_iter: initialize "flags" in new pipe_buffer	2022-02-23 11:59:59 +01:00
mm	memfd: fix F_SEAL_WRITE after shmem huge page allocated	2022-03-08 19:07:49 +01:00
net	net: dcb: disable softirqs in dcbnl_flush_dev()	2022-03-08 19:07:51 +01:00
samples	samples/kretprobes: Fix return value if register_kretprobe() failed	2021-11-17 09:48:39 +01:00
scripts	kconfig: fix failing to generate auto.conf	2022-02-23 12:00:01 +01:00
security	ima: Do not print policy rule with inactive LSM labels	2022-02-16 12:52:47 +01:00
sound	ASoC: cs4265: Fix the duplicated control name	2022-03-08 19:07:49 +01:00
tools	perf data: Fix double free in perf_session__delete()	2022-03-02 11:41:05 +01:00
usr	…
virt	KVM: do not shrink halt_poll_ns below grow_start	2021-10-09 14:39:50 +02:00
.clang-format	…
.cocciconfig	…
.get_maintainer.ignore	…
.gitattributes	…
.gitignore	…
.mailmap	…
COPYING	…
CREDITS	…
Kbuild	…
Kconfig	…
MAINTAINERS	…
Makefile	Linux 5.4.182	2022-03-02 11:41:18 +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.