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Fedor Pchelkin a5296e9c26 wifi: rtw89: avoid circular locking dependency in ser_state_run() 
[ Upstream commit 570f945117 ]

Lockdep gives a splat [1] when ser_hdl_work item is executed.  It is
scheduled at mac80211 workqueue via ieee80211_queue_work() and takes a
wiphy lock inside.  However, this workqueue can be flushed when e.g.
closing the interface and wiphy lock is already taken in that case.

Choosing wiphy_work_queue() for SER is likely not suitable.  Back on to
the global workqueue.

[1]:

 WARNING: possible circular locking dependency detected
 6.17.0-rc2 #17 Not tainted
 ------------------------------------------------------
 kworker/u32:1/61 is trying to acquire lock:
 ffff88811bc00768 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: ser_state_run+0x5e/0x180 [rtw89_core]

 but task is already holding lock:
 ffffc9000048fd30 ((work_completion)(&ser->ser_hdl_work)){+.+.}-{0:0}, at: process_one_work+0x7b5/0x1450

 which lock already depends on the new lock.

 the existing dependency chain (in reverse order) is:

 -> #2 ((work_completion)(&ser->ser_hdl_work)){+.+.}-{0:0}:
        process_one_work+0x7c6/0x1450
        worker_thread+0x49e/0xd00
        kthread+0x313/0x640
        ret_from_fork+0x221/0x300
        ret_from_fork_asm+0x1a/0x30

 -> #1 ((wq_completion)phy0){+.+.}-{0:0}:
        touch_wq_lockdep_map+0x8e/0x180
        __flush_workqueue+0x129/0x10d0
        ieee80211_stop_device+0xa8/0x110
        ieee80211_do_stop+0x14ce/0x2880
        ieee80211_stop+0x13a/0x2c0
        __dev_close_many+0x18f/0x510
        __dev_change_flags+0x25f/0x670
        netif_change_flags+0x7b/0x160
        do_setlink.isra.0+0x1640/0x35d0
        rtnl_newlink+0xd8c/0x1d30
        rtnetlink_rcv_msg+0x700/0xb80
        netlink_rcv_skb+0x11d/0x350
        netlink_unicast+0x49a/0x7a0
        netlink_sendmsg+0x759/0xc20
        ____sys_sendmsg+0x812/0xa00
        ___sys_sendmsg+0xf7/0x180
        __sys_sendmsg+0x11f/0x1b0
        do_syscall_64+0xbb/0x360
        entry_SYSCALL_64_after_hwframe+0x77/0x7f

 -> #0 (&rdev->wiphy.mtx){+.+.}-{4:4}:
        __lock_acquire+0x124c/0x1d20
        lock_acquire+0x154/0x2e0
        __mutex_lock+0x17b/0x12f0
        ser_state_run+0x5e/0x180 [rtw89_core]
        rtw89_ser_hdl_work+0x119/0x220 [rtw89_core]
        process_one_work+0x82d/0x1450
        worker_thread+0x49e/0xd00
        kthread+0x313/0x640
        ret_from_fork+0x221/0x300
        ret_from_fork_asm+0x1a/0x30

 other info that might help us debug this:

 Chain exists of:
   &rdev->wiphy.mtx --> (wq_completion)phy0 --> (work_completion)(&ser->ser_hdl_work)

  Possible unsafe locking scenario:

        CPU0                    CPU1
        ----                    ----
   lock((work_completion)(&ser->ser_hdl_work));
                                lock((wq_completion)phy0);
                                lock((work_completion)(&ser->ser_hdl_work));
   lock(&rdev->wiphy.mtx);

  *** DEADLOCK ***

 2 locks held by kworker/u32:1/61:
  #0: ffff888103835148 ((wq_completion)phy0){+.+.}-{0:0}, at: process_one_work+0xefa/0x1450
  #1: ffffc9000048fd30 ((work_completion)(&ser->ser_hdl_work)){+.+.}-{0:0}, at: process_one_work+0x7b5/0x1450

 stack backtrace:
 CPU: 0 UID: 0 PID: 61 Comm: kworker/u32:1 Not tainted 6.17.0-rc2 #17 PREEMPT(voluntary)
 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS edk2-20250523-14.fc42 05/23/2025
 Workqueue: phy0 rtw89_ser_hdl_work [rtw89_core]
 Call Trace:
  <TASK>
  dump_stack_lvl+0x5d/0x80
  print_circular_bug.cold+0x178/0x1be
  check_noncircular+0x14c/0x170
  __lock_acquire+0x124c/0x1d20
  lock_acquire+0x154/0x2e0
  __mutex_lock+0x17b/0x12f0
  ser_state_run+0x5e/0x180 [rtw89_core]
  rtw89_ser_hdl_work+0x119/0x220 [rtw89_core]
  process_one_work+0x82d/0x1450
  worker_thread+0x49e/0xd00
  kthread+0x313/0x640
  ret_from_fork+0x221/0x300
  ret_from_fork_asm+0x1a/0x30
  </TASK>

Found by Linux Verification Center (linuxtesting.org).

Fixes: ebfc9199df ("wifi: rtw89: add wiphy_lock() to work that isn't held wiphy_lock() yet")
Signed-off-by: Fedor Pchelkin <pchelkin@ispras.ru>
Acked-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Link: https://patch.msgid.link/20250919210852.823912-5-pchelkin@ispras.ru
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2025-10-15 12:04:05 +02:00
arch sparc: fix accurate exception reporting in copy_{from,to}_user for M7 2025-10-15 12:04:03 +02:00
block blk-throttle: fix throtl_data leak during disk release 2025-10-15 12:03:34 +02:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto crypto: comp - Use same definition of context alloc and free ops 2025-10-15 12:04:04 +02:00
Documentation Documentation: trace: historgram-design: Separate sched_waking histogram section heading and the following diagram 2025-10-15 12:04:01 +02:00
drivers wifi: rtw89: avoid circular locking dependency in ser_state_run() 2025-10-15 12:04:05 +02:00
fs f2fs: fix zero-sized extent for precache extents 2025-10-15 12:04:00 +02:00
include crypto: comp - Use same definition of context alloc and free ops 2025-10-15 12:04:04 +02:00
init Fix CC_HAS_ASM_GOTO_OUTPUT on non-x86 architectures 2025-10-15 12:03:13 +02:00
io_uring io_uring-6.17-20250919 2025-09-19 12:10:49 -07:00
ipc vfs-6.17-rc1.mmap_prepare 2025-07-28 13:43:25 -07:00
kernel srcu/tiny: Remove preempt_disable/enable() in srcu_gp_start_if_needed() 2025-10-15 12:03:58 +02:00
lib vdso/datastore: Gate time data behind CONFIG_GENERIC_GETTIMEOFDAY 2025-10-15 12:03:24 +02:00
LICENSES LICENSES: Replace the obsolete address of the FSF in the GFDL-1.2 2025-07-24 11:15:39 +02:00
mm mm/slub: Fix cmp_loc_by_count() to return 0 when counts are equal 2025-10-15 12:03:56 +02:00
net wifi: mac80211: fix Rx packet handling when pubsta information is not available 2025-10-15 12:04:03 +02:00
rust rust: cpumask: Mark CpumaskVar as transparent 2025-10-15 12:03:19 +02:00
samples 15 hotfixes. 11 are cc:stable and the remainder address post-6.16 issues 2025-09-17 21:34:26 -07:00
scripts scripts/misc-check: update export checks for EXPORT_SYMBOL_FOR_MODULES() 2025-10-15 12:03:22 +02:00
security lsm: CONFIG_LSM can depend on CONFIG_SECURITY 2025-10-15 12:03:17 +02:00
sound ASoC: Intel: sof_sdw: Prevent jump to NULL add_sidecar callback 2025-10-15 12:04:03 +02:00
tools selftests/mm: fix va_high_addr_switch.sh failure on x86_64 2025-10-15 12:04:04 +02:00
usr usr/include: openrisc: don't HDRTEST bpf_perf_event.h 2025-05-12 15:03:17 +09:00
virt Merge tag 'kvm-x86-no_assignment-6.17' of https://github.com/kvm-x86/linux into HEAD 2025-07-29 08:36:42 -04:00
.clang-format Linux 6.15-rc5 2025-05-06 16:39:25 +10:00
.clippy.toml rust: clean Rust 1.88.0's warning about clippy::disallowed_macros configuration 2025-05-07 00:11:47 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.editorconfig .editorconfig: remove trim_trailing_whitespace option 2024-06-13 16:47:52 +02:00
.get_maintainer.ignore MAINTAINERS: remove Alyssa Rosenzweig 2025-09-18 21:17:31 +02:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore gitignore: allow .pylintrc to be tracked 2025-07-02 17:10:04 -06:00
.mailmap 7 hotfixes. 4 are cc:stable and the remainder address post-6.16 issues or 2025-09-28 09:32:00 -07:00
.pylintrc docs: add a .pylintrc file with sys path for docs scripts 2025-04-09 12:10:33 -06:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: retire Boris from TLS maintainers 2025-08-26 17:36:01 -07:00
Kbuild drm: ensure drm headers are self-contained and pass kernel-doc 2025-02-12 10:44:43 +02:00
Kconfig io_uring: Rename KConfig to Kconfig 2025-02-19 14:53:27 -07:00
MAINTAINERS i2c-for-6.17-rc8 2025-09-28 13:19:23 -07:00
Makefile Linux 6.17.2 2025-10-12 13:01:58 +02:00
README README: Fix spelling 2024-03-18 03:36:32 -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 reStructuredText 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.