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Duoming Zhou 9b4fb916e6 mtd: sm_ftl: Fix deadlock caused by cancel_work_sync in sm_release 
[ Upstream commit a61528d997 ]

There is a deadlock between sm_release and sm_cache_flush_work
which is a work item. The cancel_work_sync in sm_release will
not return until sm_cache_flush_work is finished. If we hold
mutex_lock and use cancel_work_sync to wait the work item to
finish, the work item also requires mutex_lock. As a result,
the sm_release will be blocked forever. The race condition is
shown below:

    (Thread 1)             |   (Thread 2)
sm_release                 |
  mutex_lock(&ftl->mutex)  | sm_cache_flush_work
                           |   mutex_lock(&ftl->mutex)
  cancel_work_sync         |   ...

This patch moves del_timer_sync and cancel_work_sync out of
mutex_lock in order to mitigate deadlock.

Fixes: 7d17c02a01 ("mtd: Add new SmartMedia/xD FTL")
Signed-off-by: Duoming Zhou <duoming@zju.edu.cn>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20220524044841.10517-1-duoming@zju.edu.cn
Signed-off-by: Sasha Levin <sashal@kernel.org>
2022-08-25 11:11:20 +02:00
arch arm64: dts: qcom: msm8916: Fix typo in pronto remoteproc node 2022-08-25 11:11:15 +02:00
block block-map: add __GFP_ZERO flag for alloc_page in function bio_copy_kern 2022-06-06 08:20:57 +02:00
certs certs/blacklist_hashes.c: fix const confusion in certs blacklist 2022-06-25 11:46:44 +02:00
crypto crypto: drbg - make reseeding from get_random_bytes() synchronous 2022-06-25 11:46:41 +02:00
Documentation ipv4: Fix data-races around sysctl_ip_dynaddr. 2022-07-21 20:42:45 +02:00
drivers mtd: sm_ftl: Fix deadlock caused by cancel_work_sync in sm_release 2022-08-25 11:11:20 +02:00
firmware Fix built-in early-load Intel microcode alignment 2020-01-23 08:20:30 +01:00
fs fs: check FMODE_LSEEK to control internal pipe splicing 2022-08-25 11:11:18 +02:00
include can: error: specify the values of data[5..7] of CAN error frames 2022-08-25 11:11:19 +02:00
init random: handle latent entropy and command line from random_init() 2022-06-25 11:46:40 +02:00
ipc ipc: WARN if trying to remove ipc object which is absent 2021-12-08 08:46:53 +01:00
kernel PM: hibernate: defer device probing when resuming from hibernation 2022-08-25 11:11:14 +02:00
lib ida: don't use BUG_ON() for debugging 2022-07-12 16:27:29 +02:00
mm mm/mempolicy: fix uninit-value in mpol_rebind_policy() 2022-07-29 17:06:50 +02:00
net dccp: put dccp_qpolicy_full() and dccp_qpolicy_push() in the same lock 2022-08-25 11:11:20 +02:00
samples samples/kretprobes: Fix return value if register_kretprobe() failed 2021-11-26 11:40:31 +01:00
scripts modpost: fix section mismatch check for exported init/exit sections 2022-07-02 16:18:10 +02:00
security selinux: Add boundary check in put_entry() 2022-08-25 11:11:14 +02:00
sound ALSA: hda/cirrus - support for iMac 12,1 model 2022-08-25 11:11:11 +02:00
tools selftests: timers: clocksource-switch: fix passing errors from child 2022-08-25 11:11:18 +02:00
usr initramfs: restore default compression behavior 2020-04-13 10:34:19 +02:00
virt KVM: Prevent module exit until all VMs are freed 2022-04-20 09:08:24 +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: rpm-pkg: keep spec file until make mrproper 2018-02-13 10:19:46 +01:00
.mailmap .mailmap: Add Maciej W. Rozycki's Imagination e-mail address 2017-11-10 12:16:15 -08:00
COPYING
CREDITS MAINTAINERS: update TPM driver infrastructure changes 2017-11-09 17:58:40 -08:00
Kbuild License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
Kconfig License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
MAINTAINERS MAINTAINERS: co-maintain random.c 2022-06-25 11:46:29 +02:00
Makefile Makefile: link with -z noexecstack --no-warn-rwx-segments 2022-08-25 11:11:10 +02:00
README README: add a new README file, pointing to the Documentation/ 2016-10-24 08:12:35 -02:00

README 

Linux kernel
============

This file was moved to Documentation/admin-guide/README.rst

Please notice that there are several guides for kernel developers and users.
These guides can be rendered in a number of formats, like HTML and PDF.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.

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.