[ Upstream commit cba6cfdc7c3f1516f0d08ddfb24e689af0932573 ]
An automated bot told me that there was a potential lockdep problem
with regulators. This was on the chromeos-5.15 kernel, but I see
nothing that would be different downstream compared to upstream. The
bot said:
============================================
WARNING: possible recursive locking detected
5.15.104-lockdep-17461-gc1e499ed6604 #1 Not tainted
--------------------------------------------
kworker/u16:4/115 is trying to acquire lock:
ffffff8083110170 (regulator_ww_class_mutex){+.+.}-{3:3}, at: create_regulator+0x398/0x7ec
but task is already holding lock:
ffffff808378e170 (regulator_ww_class_mutex){+.+.}-{3:3}, at: ww_mutex_trylock+0x3c/0x7b8
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0
----
lock(regulator_ww_class_mutex);
lock(regulator_ww_class_mutex);
*** DEADLOCK ***
May be due to missing lock nesting notation
4 locks held by kworker/u16:4/115:
#0: ffffff808006a948 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x520/0x1348
#1: ffffffc00e0a7cc0 ((work_completion)(&entry->work)){+.+.}-{0:0}, at: process_one_work+0x55c/0x1348
#2: ffffff80828a2260 (&dev->mutex){....}-{3:3}, at: __device_attach_async_helper+0xd0/0x2a4
#3: ffffff808378e170 (regulator_ww_class_mutex){+.+.}-{3:3}, at: ww_mutex_trylock+0x3c/0x7b8
stack backtrace:
CPU: 2 PID: 115 Comm: kworker/u16:4 Not tainted 5.15.104-lockdep-17461-gc1e499ed6604 #1 9292e52fa83c0e23762b2b3aa1bacf5787a4d5da
Hardware name: Google Quackingstick (rev0+) (DT)
Workqueue: events_unbound async_run_entry_fn
Call trace:
dump_backtrace+0x0/0x4ec
show_stack+0x34/0x50
dump_stack_lvl+0xdc/0x11c
dump_stack+0x1c/0x48
__lock_acquire+0x16d4/0x6c74
lock_acquire+0x208/0x750
__mutex_lock_common+0x11c/0x11f8
ww_mutex_lock+0xc0/0x440
create_regulator+0x398/0x7ec
regulator_resolve_supply+0x654/0x7c4
regulator_register_resolve_supply+0x30/0x120
class_for_each_device+0x1b8/0x230
regulator_register+0x17a4/0x1f40
devm_regulator_register+0x60/0xd0
reg_fixed_voltage_probe+0x728/0xaec
platform_probe+0x150/0x1c8
really_probe+0x274/0xa20
__driver_probe_device+0x1dc/0x3f4
driver_probe_device+0x78/0x1c0
__device_attach_driver+0x1ac/0x2c8
bus_for_each_drv+0x11c/0x190
__device_attach_async_helper+0x1e4/0x2a4
async_run_entry_fn+0xa0/0x3ac
process_one_work+0x638/0x1348
worker_thread+0x4a8/0x9c4
kthread+0x2e4/0x3a0
ret_from_fork+0x10/0x20
The problem was first reported soon after we made many of the
regulators probe asynchronously, though nothing I've seen implies that
the problems couldn't have also happened even without that.
I haven't personally been able to reproduce the lockdep issue, but the
issue does look somewhat legitimate. Specifically, it looks like in
regulator_resolve_supply() we are holding a "rdev" lock while calling
set_supply() -> create_regulator() which grabs the lock of a
_different_ "rdev" (the one for our supply). This is not necessarily
safe from a lockdep perspective since there is no documented ordering
between these two locks.
In reality, we should always be locking a regulator before the
supplying regulator, so I don't expect there to be any real deadlocks
in practice. However, the regulator framework in general doesn't
express this to lockdep.
Let's fix the issue by simply grabbing the two locks involved in the
same way we grab multiple locks elsewhere in the regulator framework:
using the "wound/wait" mechanisms.
Fixes: eaa7995c52 ("regulator: core: avoid regulator_resolve_supply() race condition")
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Link: https://lore.kernel.org/r/20230329143317.RFC.v2.2.I30d8e1ca10cfbe5403884cdd192253a2e063eb9e@changeid
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
849ab4cf18