mirrors
/
linux-stable
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
1
0
Fork 0
Code Issues Releases Wiki Activity
1,078,198 Commits 103 Branches 5,016 Tags 5.4 GiB
C 97.6%
Assembly 1%
Shell 0.5%
Python 0.3%
Makefile 0.3%
Go to file
Duoming Zhou 553213432e drivers: tty: serial: Fix deadlock in sa1100_set_termios() 
[ Upstream commit 62b2caef40 ]

There is a deadlock in sa1100_set_termios(), which is shown
below:

   (Thread 1)              |      (Thread 2)
                           | sa1100_enable_ms()
sa1100_set_termios()       |  mod_timer()
 spin_lock_irqsave() //(1) |  (wait a time)
 ...                       | sa1100_timeout()
 del_timer_sync()          |  spin_lock_irqsave() //(2)
 (wait timer to stop)      |  ...

We hold sport->port.lock in position (1) of thread 1 and
use del_timer_sync() to wait timer to stop, but timer handler
also need sport->port.lock in position (2) of thread 2. As a result,
sa1100_set_termios() will block forever.

This patch moves del_timer_sync() before spin_lock_irqsave()
in order to prevent the deadlock.

Signed-off-by: Duoming Zhou <duoming@zju.edu.cn>
Link: https://lore.kernel.org/r/20220417111626.7802-1-duoming@zju.edu.cn
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
 		2022-06-14 18:41:34 +02:00
Documentation rtla/Makefile: Properly handle dependencies 2022-06-14 18:41:28 +02:00
LICENSES LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers 2021-12-16 14:33:10 +01:00
arch bpf, arm64: Clear prog->jited_len along prog->jited 2022-06-14 18:41:31 +02:00
block blk-mq: do not update io_ticks with passthrough requests 2022-06-14 18:41:23 +02:00
certs certs: Fix build error when CONFIG_MODULE_SIG_KEY is empty 2022-01-23 00:08:44 +09:00
crypto crypto: cryptd - Protect per-CPU resource by disabling BH. 2022-06-09 10:26:07 +02:00
drivers drivers: tty: serial: Fix deadlock in sa1100_set_termios() 2022-06-14 18:41:34 +02:00
fs f2fs: fix to tag gcing flag on page during file defragment 2022-06-14 18:41:28 +02:00
include iio: st_sensors: Add a local lock for protecting odr 2022-06-14 18:41:33 +02:00
init Kconfig: Add option for asm goto w/ tied outputs to workaround clang-13 bug 2022-06-09 10:26:25 +02:00
ipc ipc/mqueue: use get_tree_nodev() in mqueue_get_tree() 2022-06-09 10:26:06 +02:00
kernel tracing: Avoid adding tracer option before update_tracer_options 2022-06-14 18:41:27 +02:00
lib iov_iter: Fix iter_xarray_get_pages{,_alloc}() 2022-06-14 18:41:33 +02:00
mm mm/memremap: fix missing call to untrack_pfn() in pagemap_range() 2022-06-09 10:26:28 +02:00
net tcp: use alloc_large_system_hash() to allocate table_perturb 2022-06-14 18:41:32 +02:00
samples samples/landlock: Format with clang-format 2022-06-09 10:26:22 +02:00
scripts modpost: fix removing numeric suffixes 2022-06-14 18:41:21 +02:00
security ima: remove the IMA_TEMPLATE Kconfig option 2022-06-09 10:26:25 +02:00
sound ASoC: fsl_sai: Fix FSL_SAI_xDR/xFR definition 2022-06-14 18:41:20 +02:00
tools netfilter: nat: really support inet nat without l3 address 2022-06-14 18:41:29 +02:00
usr kbuild: remove include/linux/cyclades.h from header file check 2022-01-27 08:51:08 +01:00
virt KVM: Free new dirty bitmap if creating a new memslot fails 2022-05-25 09:59:03 +02:00
.clang-format genirq/msi: Make interrupt allocation less convoluted 2021-12-16 22:22:20 +01:00
.cocciconfig
…
.get_maintainer.ignore
…
.gitattributes
…
.gitignore .gitignore: ignore only top-level modules.builtin 2021-05-02 00:43:35 +09:00
.mailmap MAINTAINERS: Update Jisheng's email address 2022-03-08 17:30:32 +01:00
COPYING
…
CREDITS MAINTAINERS: replace a Microchip AT91 maintainer 2022-02-09 11:30:01 +01:00
Kbuild
…
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS net: dsa: realtek-smi: move to subdirectory 2022-04-08 13:58:12 +02:00
Makefile Linux 5.17.14 2022-06-09 10:26:33 +02:00
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.