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Sebastian Andrzej Siewior 6967cfe198 Bluetooth: Acquire sk_lock.slock without disabling interrupts 
[ Upstream commit e6da0edc24eecef2f6964d92fa9044e1821deace ]

There was a lockdep which led to commit
   fad003b6c8 ("Bluetooth: Fix inconsistent lock state with RFCOMM")

Lockdep noticed that `sk->sk_lock.slock' was acquired without disabling
the softirq while the lock was also used in softirq context.
Unfortunately the solution back then was to disable interrupts before
acquiring the lock which however made lockdep happy.
It would have been enough to simply disable the softirq. Disabling
interrupts before acquiring a spinlock_t is not allowed on PREEMPT_RT
because these locks are converted to 'sleeping' spinlocks.

Use spin_lock_bh() in order to acquire the `sk_lock.slock'.

Cc: stable-rt@vger.kernel.org
Reported-by: Luis Claudio R. Goncalves <lclaudio@uudg.org>
Reported-by: kbuild test robot <lkp@intel.com> [missing unlock]
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
 		2023-03-25 04:21:36 +03:00
Documentation Use CONFIG_PREEMPTION 2023-03-25 04:21:18 +03:00
LICENSES LICENSES: Rename other to deprecated 2019-05-03 06:34:32 -06:00
arch mips: Disable highmem on RT 2023-03-25 04:21:34 +03:00
block block: Use cpu_chill() for retry loops 2023-03-25 04:21:28 +03:00
certs certs: Trigger creation of RSA module signing key if it's not an RSA key 2021-09-15 09:47:29 +02:00
crypto crypto: cryptd - add a lock instead preempt_disable/local_bh_disable 2023-03-25 04:21:29 +03:00
drivers tpm_tis: fix stall after iowrite*()s 2023-03-25 04:21:35 +03:00
fs fs/dcache: Include swait.h header 2023-03-25 04:21:35 +03:00
include workqueue: Sync with upstream 2023-03-25 04:21:36 +03:00
init kernel/sched/core: add migrate_disable() 2023-03-25 04:21:26 +03:00
ipc shm: extend forced shm destroy to support objects from several IPC nses 2021-12-01 09:23:35 +01:00
kernel workqueue: Sync with upstream 2023-03-25 04:21:36 +03:00
lib mm/scatterlist: Do not disable irqs on RT 2023-03-25 04:21:32 +03:00
mm mm/zswap: Use local lock to protect per-CPU data 2023-03-25 04:21:36 +03:00
net Bluetooth: Acquire sk_lock.slock without disabling interrupts 2023-03-25 04:21:36 +03:00
samples samples/kretprobes: Fix return value if register_kretprobe() failed 2021-11-17 09:48:39 +01:00
scripts gcc-plugins: latent_entropy: use /dev/urandom 2022-04-20 09:19:38 +02:00
security apparmor: use a locallock instead preempt_disable() 2023-03-25 04:21:30 +03:00
sound ALSA: pcm: Fix potential AB/BA lock with buffer_mutex and mmap_lock 2022-05-12 12:23:49 +02:00
tools selftests: mirror_gre_bridge_1q: Avoid changing PVID while interface is operational 2022-05-12 12:23:46 +02:00
usr initramfs: restore default compression behavior 2020-04-08 09:08:38 +02:00
virt KVM: arm/arm64: downgrade preempt_disable()d region to migrate_disable() 2023-03-25 04:21:34 +03:00
.clang-format clang-format: Update with the latest for_each macro list 2019-08-31 10:00:51 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore Opt out of scripts/get_maintainer.pl 2019-05-16 10:53:40 -07:00
.gitattributes .gitattributes: set git diff driver for C source code files 2016-10-07 18:46:30 -07:00
.gitignore Modules updates for v5.4 2019-09-22 10:34:46 -07:00
.mailmap ARM: SoC fixes 2019-11-10 13:41:59 -08:00
COPYING COPYING: use the new text with points to the license files 2018-03-23 12:41:45 -06:00
CREDITS MAINTAINERS: Remove Simon as Renesas SoC Co-Maintainer 2019-10-10 08:12:51 -07:00
Kbuild kbuild: do not descend to ./Kbuild when cleaning 2019-08-21 21:03:58 +09:00
Kconfig docs: kbuild: convert docs to ReST and rename to *.rst 2019-06-14 14:21:21 -06:00
MAINTAINERS Documentation/llvm: add documentation on building w/ Clang/LLVM 2020-08-26 10:40:46 +02:00
Makefile Linux 5.4.193 2022-05-12 12:23:51 +02:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00
localversion-rt Add localversion for -RT release 2023-03-25 04:21:35 +03:00

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.