Mukesh Ojha 31569995fc PM / devfreq: Synchronize devfreq_monitor_[start/stop] ... [ Upstream commit aed5ed5959 ] There is a chance if a frequent switch of the governor done in a loop result in timer list corruption where timer cancel being done from two place one from cancel_delayed_work_sync() and followed by expire_timers() can be seen from the traces[1]. while true do echo "simple_ondemand" > /sys/class/devfreq/1d84000.ufshc/governor echo "performance" > /sys/class/devfreq/1d84000.ufshc/governor done It looks to be issue with devfreq driver where device_monitor_[start/stop] need to synchronized so that delayed work should get corrupted while it is either being queued or running or being cancelled. Let's use polling flag and devfreq lock to synchronize the queueing the timer instance twice and work data being corrupted. [1] ... .. <idle>-0 [003] 9436.209662: timer_cancel timer=0xffffff80444f0428 <idle>-0 [003] 9436.209664: timer_expire_entry timer=0xffffff80444f0428 now=0x10022da1c function=__typeid__ZTSFvP10timer_listE_global_addr baseclk=0x10022da1c <idle>-0 [003] 9436.209718: timer_expire_exit timer=0xffffff80444f0428 kworker/u16:6-14217 [003] 9436.209863: timer_start timer=0xffffff80444f0428 function=__typeid__ZTSFvP10timer_listE_global_addr expires=0x10022da2b now=0x10022da1c flags=182452227 vendor.xxxyyy.ha-1593 [004] 9436.209888: timer_cancel timer=0xffffff80444f0428 vendor.xxxyyy.ha-1593 [004] 9436.216390: timer_init timer=0xffffff80444f0428 vendor.xxxyyy.ha-1593 [004] 9436.216392: timer_start timer=0xffffff80444f0428 function=__typeid__ZTSFvP10timer_listE_global_addr expires=0x10022da2c now=0x10022da1d flags=186646532 vendor.xxxyyy.ha-1593 [005] 9436.220992: timer_cancel timer=0xffffff80444f0428 xxxyyyTraceManag-7795 [004] 9436.261641: timer_cancel timer=0xffffff80444f0428 [2] 9436.261653][ C4] Unable to handle kernel paging request at virtual address dead00000000012a [ 9436.261664][ C4] Mem abort info: [ 9436.261666][ C4] ESR = 0x96000044 [ 9436.261669][ C4] EC = 0x25: DABT (current EL), IL = 32 bits [ 9436.261671][ C4] SET = 0, FnV = 0 [ 9436.261673][ C4] EA = 0, S1PTW = 0 [ 9436.261675][ C4] Data abort info: [ 9436.261677][ C4] ISV = 0, ISS = 0x00000044 [ 9436.261680][ C4] CM = 0, WnR = 1 [ 9436.261682][ C4] [dead00000000012a] address between user and kernel address ranges [ 9436.261685][ C4] Internal error: Oops: 96000044 [#1] PREEMPT SMP [ 9436.261701][ C4] Skip md ftrace buffer dump for: 0x3a982d0 ... [ 9436.262138][ C4] CPU: 4 PID: 7795 Comm: TraceManag Tainted: G S W O 5.10.149-android12-9-o-g17f915d29d0c #1 [ 9436.262141][ C4] Hardware name: Qualcomm Technologies, Inc. (DT) [ 9436.262144][ C4] pstate: 22400085 (nzCv daIf +PAN -UAO +TCO BTYPE=--) [ 9436.262161][ C4] pc : expire_timers+0x9c/0x438 [ 9436.262164][ C4] lr : expire_timers+0x2a4/0x438 [ 9436.262168][ C4] sp : ffffffc010023dd0 [ 9436.262171][ C4] x29: ffffffc010023df0 x28: ffffffd0636fdc18 [ 9436.262178][ C4] x27: ffffffd063569dd0 x26: ffffffd063536008 [ 9436.262182][ C4] x25: 0000000000000001 x24: ffffff88f7c69280 [ 9436.262185][ C4] x23: 00000000000000e0 x22: dead000000000122 [ 9436.262188][ C4] x21: 000000010022da29 x20: ffffff8af72b4e80 [ 9436.262191][ C4] x19: ffffffc010023e50 x18: ffffffc010025038 [ 9436.262195][ C4] x17: 0000000000000240 x16: 0000000000000201 [ 9436.262199][ C4] x15: ffffffffffffffff x14: ffffff889f3c3100 [ 9436.262203][ C4] x13: ffffff889f3c3100 x12: 00000000049f56b8 [ 9436.262207][ C4] x11: 00000000049f56b8 x10: 00000000ffffffff [ 9436.262212][ C4] x9 : ffffffc010023e50 x8 : dead000000000122 [ 9436.262216][ C4] x7 : ffffffffffffffff x6 : ffffffc0100239d8 [ 9436.262220][ C4] x5 : 0000000000000000 x4 : 0000000000000101 [ 9436.262223][ C4] x3 : 0000000000000080 x2 : ffffff889edc155c [ 9436.262227][ C4] x1 : ffffff8001005200 x0 : ffffff80444f0428 [ 9436.262232][ C4] Call trace: [ 9436.262236][ C4] expire_timers+0x9c/0x438 [ 9436.262240][ C4] __run_timers+0x1f0/0x330 [ 9436.262245][ C4] run_timer_softirq+0x28/0x58 [ 9436.262255][ C4] efi_header_end+0x168/0x5ec [ 9436.262265][ C4] __irq_exit_rcu+0x108/0x124 [ 9436.262274][ C4] __handle_domain_irq+0x118/0x1e4 [ 9436.262282][ C4] gic_handle_irq.30369+0x6c/0x2bc [ 9436.262286][ C4] el0_irq_naked+0x60/0x6c Link: https://lore.kernel.org/all/1700860318-4025-1-git-send-email-quic_mojha@quicinc.com/ Reported-by: Joyyoung Huang <huangzaiyang@oppo.com> Acked-by: MyungJoo Ham <myungjoo.ham@samsung.com> Signed-off-by: Mukesh Ojha <quic_mojha@quicinc.com> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com> Signed-off-by: Sasha Levin <sashal@kernel.org>		2024-02-05 20:12:47 +00:00
..
event	PM / devfreq: rockchip-dfi: Make pmu regmap mandatory	2023-11-20 11:51:54 +01:00
devfreq-event.c	PM / devfreq: event: Change prototype of devfreq_event_get_edev_by_phandle function	2020-09-29 17:50:10 +09:00
devfreq.c	PM / devfreq: Synchronize devfreq_monitor_[start/stop]	2024-02-05 20:12:47 +00:00
exynos-bus.c	OPP updates for 5.20-rc1	2022-08-03 17:49:38 +02:00
governor_passive.c	PM / devfreq: passive: revert an editing accident in SPDX-License line	2022-06-30 05:11:17 +09:00
governor_performance.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500	2019-06-19 17:09:55 +02:00
governor_powersave.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500	2019-06-19 17:09:55 +02:00
governor_simpleondemand.c	PM / devfreq: Add governor attribute flag for specifc sysfs nodes	2020-10-26 11:46:54 +09:00
governor_userspace.c	PM/devfreq: governor: Add a private governor_data for governor	2023-01-07 11:11:40 +01:00
governor.h	PM / devfreq: passive: Keep cpufreq_policy for possible cpus	2022-05-17 18:24:39 +09:00
imx8m-ddrc.c	PM / devfreq: imx8m-ddrc: Remove unneeded of_match_ptr()	2021-04-08 13:14:51 +09:00
imx-bus.c	Char / Misc driver changes for 6.0-rc1	2022-08-04 11:05:48 -07:00
Kconfig	PM / devfreq: mediatek: Introduce MediaTek CCI devfreq driver	2022-07-15 11:40:08 +09:00
Makefile	PM / devfreq: mediatek: Introduce MediaTek CCI devfreq driver	2022-07-15 11:40:08 +09:00
mtk-cci-devfreq.c	PM / devfreq: mtk-cci: Handle sram regulator probe deferral	2022-09-26 03:59:12 +09:00
rk3399_dmc.c	PM / devfreq: rk3399_dmc: Block PMU during transitions	2022-05-09 03:38:07 +09:00
sun8i-a33-mbus.c	PM / devfreq: Add a driver for the sun8i/sun50i MBUS	2021-12-10 15:56:07 +09:00
tegra30-devfreq.c	OPP updates for 5.20-rc1	2022-08-03 17:49:38 +02:00