Pierre Gondois 43b1df48d1 ACPI: CPPC: Make rmw_lock a raw_spin_lock ... [ Upstream commit 1c10941e34 ] The following BUG was triggered: ============================= [ BUG: Invalid wait context ] 6.12.0-rc2-XXX #406 Not tainted ----------------------------- kworker/1:1/62 is trying to lock: ffffff8801593030 (&cpc_ptr->rmw_lock){+.+.}-{3:3}, at: cpc_write+0xcc/0x370 other info that might help us debug this: context-{5:5} 2 locks held by kworker/1:1/62: #0: ffffff897ef5ec98 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2c/0x50 #1: ffffff880154e238 (&sg_policy->update_lock){....}-{2:2}, at: sugov_update_shared+0x3c/0x280 stack backtrace: CPU: 1 UID: 0 PID: 62 Comm: kworker/1:1 Not tainted 6.12.0-rc2-g9654bd3e8806 #406 Workqueue: 0x0 (events) Call trace: dump_backtrace+0xa4/0x130 show_stack+0x20/0x38 dump_stack_lvl+0x90/0xd0 dump_stack+0x18/0x28 __lock_acquire+0x480/0x1ad8 lock_acquire+0x114/0x310 _raw_spin_lock+0x50/0x70 cpc_write+0xcc/0x370 cppc_set_perf+0xa0/0x3a8 cppc_cpufreq_fast_switch+0x40/0xc0 cpufreq_driver_fast_switch+0x4c/0x218 sugov_update_shared+0x234/0x280 update_load_avg+0x6ec/0x7b8 dequeue_entities+0x108/0x830 dequeue_task_fair+0x58/0x408 __schedule+0x4f0/0x1070 schedule+0x54/0x130 worker_thread+0xc0/0x2e8 kthread+0x130/0x148 ret_from_fork+0x10/0x20 sugov_update_shared() locks a raw_spinlock while cpc_write() locks a spinlock. To have a correct wait-type order, update rmw_lock to a raw spinlock and ensure that interrupts will be disabled on the CPU holding it. Fixes: 60949b7b80 ("ACPI: CPPC: Fix MASK_VAL() usage") Signed-off-by: Pierre Gondois <pierre.gondois@arm.com> Link: https://patch.msgid.link/20241028125657.1271512-1-pierre.gondois@arm.com [ rjw: Changelog edits ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Sasha Levin <sashal@kernel.org>		2024-11-08 16:30:49 +01:00
..
acpi	ACPI: CPPC: Make rmw_lock a raw_spin_lock	2024-11-08 16:30:49 +01:00
asm-generic	runtime constants: deal with old decrepit linkers	2024-08-03 08:38:45 -07:00
clocksource
crypto	crypto: simd - Do not call crypto_alloc_tfm during registration	2024-10-10 12:03:13 +02:00
drm	drm/sched: Fix dynamic job-flow control race	2024-10-10 12:04:11 +02:00
dt-bindings	dt-bindings: clock: qcom: Add GPLL9 support on gcc-sc8180x	2024-10-10 12:04:02 +02:00
keys
kunit	kunit: Fix missing kerneldoc comment	2024-09-05 14:29:10 -06:00
kvm
linux	kasan: Fix Software Tag-Based KASAN with GCC	2024-11-08 16:30:49 +01:00
math-emu
media
memory
misc
net	ipv4: ip_tunnel: Fix suspicious RCU usage warning in ip_tunnel_init_flow()	2024-11-08 16:30:47 +01:00
pcmcia
ras
rdma
rv
scsi	scsi: core: Fix the return value of scsi_logical_block_count()	2024-08-16 21:02:06 -04:00
soc	net: mscc: ocelot: treat 802.1ad tagged traffic as 802.1Q-untagged	2024-08-16 09:59:32 +01:00
sound	ASoC: tas2781-i2c: Drop weird GPIO code	2024-10-04 16:37:38 +02:00
target
trace	afs: Fix missing subdir edit when renamed between parent dirs	2024-11-08 16:30:49 +01:00
uapi	dpll: add Embedded SYNC feature for a pin	2024-11-08 16:30:47 +01:00
ufs	scsi: ufs: core: Add a quirk for handling broken LSDBS field in controller capabilities register	2024-08-16 21:09:17 -04:00
vdso	Random number generator updates for Linux 6.11-rc1.	2024-07-24 10:29:50 -07:00
video
xen	Driver core changes for 6.11-rc1	2024-07-25 10:42:22 -07:00