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Message-ID: <5f3911ffd2c09b6d86300c3905e9c760698df069.camel@mediatek.com>
Date: Fri, 25 Jul 2025 09:13:20 +0000
From: Peter Wang (王信友) <peter.wang@...iatek.com>
To: "beanhuo@...ron.com" <beanhuo@...ron.com>, "avri.altman@....com"
<avri.altman@....com>, "quic_rampraka@...cinc.com"
<quic_rampraka@...cinc.com>, "quic_cang@...cinc.com" <quic_cang@...cinc.com>,
"quic_nguyenb@...cinc.com" <quic_nguyenb@...cinc.com>,
"quic_nitirawa@...cinc.com" <quic_nitirawa@...cinc.com>, "bvanassche@....org"
<bvanassche@....org>, "quic_ziqichen@...cinc.com"
<quic_ziqichen@...cinc.com>, "neil.armstrong@...aro.org"
<neil.armstrong@...aro.org>, "luca.weiss@...rphone.com"
<luca.weiss@...rphone.com>, "konrad.dybcio@....qualcomm.com"
<konrad.dybcio@....qualcomm.com>, "junwoo80.lee@...sung.com"
<junwoo80.lee@...sung.com>, "mani@...nel.org" <mani@...nel.org>,
"martin.petersen@...cle.com" <martin.petersen@...cle.com>
CC: "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
Tze-nan Wu (吳澤南) <Tze-nan.Wu@...iatek.com>,
"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
"manivannan.sadhasivam@...aro.org" <manivannan.sadhasivam@...aro.org>,
"alim.akhtar@...sung.com" <alim.akhtar@...sung.com>,
"James.Bottomley@...senPartnership.com"
<James.Bottomley@...senPartnership.com>, "linux-kernel@...r.kernel.org"
<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4] scsi: ufs: core: Don't perform UFS clkscale if host
asyn scan in progress
On Thu, 2025-05-22 at 16:12 +0800, Ziqi Chen wrote:
> When preparing for UFS clock scaling, the UFS driver will quiesce all
> sdevs
> queues in the UFS SCSI host tagset list and then unquiesce them when
> UFS
> clock scaling unpreparing. If the UFS SCSI host async scan is in
> progress
> at this time, some LUs may be added to the tagset list between UFS
> clkscale
> prepare and unprepare. This can cause two issues:
>
> 1. During clock scaling, there may be IO requests issued through new
> added
> queues that have not been quiesced, leading to task abort issue.
>
> 2. These new added queues that have not been quiesced will be
> unquiesced as
> well when UFS clkscale is unprepared, resulting in warning prints.
>
> Therefore, use the mutex lock scan_mutex in
> ufshcd_clock_scaling_prepare()
> and ufshcd_clock_scaling_unprepare() to protect it.
>
> Co-developed-by: Can Guo <quic_cang@...cinc.com>
> Signed-off-by: Can Guo <quic_cang@...cinc.com>
> Signed-off-by: Ziqi Chen <quic_ziqichen@...cinc.com>
> Suggested-by: Bart Van Assche <bvanassche@....org>
Hi Ziqi,
With this patch will have circular locking dependency detected.
Here is the backtrace log.
Could consider luns_avail instead mutex?
[ 96.496464] [T00600001343] mtkPowerMsgHdl:
======================================================
[ 96.498411] [T00600001343] mtkPowerMsgHdl: WARNING: possible
circular locking dependency detected
[ 96.500774] [T00600001343] mtkPowerMsgHdl: 6.12.30-android16-5-
g137b86aeb5da-4k #1 Tainted: G OE
[ 96.504046] [T00600001343] mtkPowerMsgHdl: -------------------------
-----------------------------
[ 96.506071] [T00600001343] mtkPowerMsgHdl: mtkPowerMsgHdl/1343 is
trying to acquire lock:
[ 96.508301] [T00600001343] ffffff80461f0078
[ 96.513718] [T00600001343] (
[ 96.515361] [T00600001343] &devfreq->lock
[ 96.516493] [T00600001343] ){+.+.}-{3:3}, at:
qos_max_notifier_call+0x2c/0x98
[ 96.517759] [T00600001343] mtkPowerMsgHdl:
[ 96.517759] [T00600001343] but task is already holding lock:
[ 96.519313] [T00600001343] ffffff804584b9c8
[ 96.521194] [T00600001343] (
[ 96.522295] [T00600001343] &(c->notifiers)->rwsem
[ 96.523243] [T00600001343] #2
[ 96.524168] [T00600001343] ){++++}-{3:3}
[ 96.525203] [T00600001343] , at:
blocking_notifier_call_chain+0x50/0x94
[ 96.526268] [T00600001343] mtkPowerMsgHdl:
[ 96.526268] [T00600001343] which lock already depends on the new
lock.
[ 96.526268] [T00600001343]
[ 96.527670] [T00600001343] mtkPowerMsgHdl:
[ 96.527670] [T00600001343] the existing dependency chain (in reverse
order) is:
[ 96.529671] [T00600001343] mtkPowerMsgHdl:
[ 96.529671] [T00600001343] -> #5
[ 96.531759] [T00600001343] (
[ 96.533247] [T00600001343] &(c->notifiers)->rwsem
[ 96.534195] [T00600001343] #2
[ 96.535121] [T00600001343] ){++++}-{3:3}
[ 96.536155] [T00600001343] :
[ 96.537223] [T00600001343] mtkPowerMsgHdl:
down_write+0xa0/0x334
[ 96.538159] [T00600001343] mtkPowerMsgHdl:
blocking_notifier_chain_register+0x5c/0xc0
[ 96.539324] [T00600001343] mtkPowerMsgHdl:
freq_qos_add_notifier+0x94/0xac
[ 96.541043] [T00600001343] mtkPowerMsgHdl:
cpufreq_online+0x220/0x1754
[ 96.542554] [T00600001343] mtkPowerMsgHdl:
cpufreq_add_dev+0x84/0x138
[ 96.544024] [T00600001343] mtkPowerMsgHdl:
subsys_interface_register+0x240/0x30c
[ 96.545806] [T00600001343] mtkPowerMsgHdl:
cpufreq_register_driver+0x2f8/0x478
[ 96.547383] [T00600001343] mtkPowerMsgHdl:
mtk_cpufreq_hw_driver_probe+0x684/0x7d4 [mediatek_cpufreq_hw]
[ 96.548396] [T00600001343] mtkPowerMsgHdl:
platform_probe+0x100/0x160
[ 96.550189] [T00600001343] mtkPowerMsgHdl:
really_probe+0x1b4/0x74c
[ 96.551787] [T00600001343] mtkPowerMsgHdl:
__driver_probe_device+0x158/0x304
[ 96.553331] [T00600001343] mtkPowerMsgHdl:
driver_probe_device+0x70/0x298
[ 96.554766] [T00600001343] mtkPowerMsgHdl:
__driver_attach+0x238/0x518
[ 96.556299] [T00600001343] mtkPowerMsgHdl:
bus_for_each_dev+0x1b4/0x20c
[ 96.557885] [T00600001343] mtkPowerMsgHdl:
driver_attach+0x48/0x58
[ 96.559356] [T00600001343] mtkPowerMsgHdl:
bus_add_driver+0x280/0x56c
[ 96.560836] [T00600001343] mtkPowerMsgHdl:
driver_register+0x15c/0x29c
[ 96.562348] [T00600001343] mtkPowerMsgHdl:
__platform_driver_register+0x68/0x7c
[ 96.563805] [T00600001343] mtkPowerMsgHdl: 0xffffffc00b2d5038
[ 96.565274] [T00600001343] mtkPowerMsgHdl:
do_one_initcall+0x214/0x778
[ 96.566818] [T00600001343] mtkPowerMsgHdl:
do_init_module+0x1cc/0x57c
[ 96.568697] [T00600001343] mtkPowerMsgHdl:
load_module+0x2658/0x3068
[ 96.571034] [T00600001343] mtkPowerMsgHdl:
__arm64_sys_finit_module+0x3e0/0x5a4
[ 96.572707] [T00600001343] mtkPowerMsgHdl:
invoke_syscall+0x78/0x250
[ 96.574567] [T00600001343] mtkPowerMsgHdl:
el0_svc_common+0x154/0x1c4
[ 96.576512] [T00600001343] mtkPowerMsgHdl:
do_el0_svc+0x48/0x58
[ 96.578597] [T00600001343] mtkPowerMsgHdl: el0_svc+0x50/0xd0
[ 96.580563] [T00600001343] mtkPowerMsgHdl:
el0t_64_sync_handler+0x70/0xbc
[ 96.582129] [T00600001343] mtkPowerMsgHdl:
el0t_64_sync+0x188/0x18c
[ 96.589641] [T00600001343] mtkPowerMsgHdl:
[ 96.589641] [T00600001343] -> #4 (subsys mutex#2){+.+.}-{3:3}:
[ 96.589653] [T00600001343] mtkPowerMsgHdl:
__mutex_lock_common+0x1dc/0x371c
[ 96.589659] [T00600001343] mtkPowerMsgHdl:
mutex_lock_nested+0x2c/0x38
[ 96.589665] [T00600001343] mtkPowerMsgHdl:
subsys_interface_register+0x160/0x30c
[ 96.589670] [T00600001343] mtkPowerMsgHdl:
cpufreq_register_driver+0x2f8/0x478
[ 96.589675] [T00600001343] mtkPowerMsgHdl:
mtk_cpufreq_hw_driver_probe+0x684/0x7d4 [mediatek_cpufreq_hw]
[ 96.589687] [T00600001343] mtkPowerMsgHdl:
platform_probe+0x100/0x160
[ 96.589694] [T00600001343] mtkPowerMsgHdl:
really_probe+0x1b4/0x74c
[ 96.589699] [T00600001343] mtkPowerMsgHdl:
__driver_probe_device+0x158/0x304
[ 96.589704] [T00600001343] mtkPowerMsgHdl:
driver_probe_device+0x70/0x298
[ 96.589709] [T00600001343] mtkPowerMsgHdl:
__driver_attach+0x238/0x518
[ 96.589714] [T00600001343] mtkPowerMsgHdl:
bus_for_each_dev+0x1b4/0x20c
[ 96.589718] [T00600001343] mtkPowerMsgHdl:
driver_attach+0x48/0x58
[ 96.589723] [T00600001343] mtkPowerMsgHdl:
bus_add_driver+0x280/0x56c
[ 96.589727] [T00600001343] mtkPowerMsgHdl:
driver_register+0x15c/0x29c
[ 96.589732] [T00600001343] mtkPowerMsgHdl:
__platform_driver_register+0x68/0x7c
[ 96.589738] [T00600001343] mtkPowerMsgHdl: 0xffffffc00b2d5038
[ 96.589753] [T00600001343] mtkPowerMsgHdl:
do_one_initcall+0x214/0x778
[ 96.589758] [T00600001343] mtkPowerMsgHdl:
do_init_module+0x1cc/0x57c
[ 96.589763] [T00600001343] mtkPowerMsgHdl:
load_module+0x2658/0x3068
[ 96.589767] [T00600001343] mtkPowerMsgHdl:
__arm64_sys_finit_module+0x3e0/0x5a4
[ 96.589772] [T00600001343] mtkPowerMsgHdl:
invoke_syscall+0x78/0x250
[ 96.589777] [T00600001343] mtkPowerMsgHdl:
el0_svc_common+0x154/0x1c4
[ 96.589782] [T00600001343] mtkPowerMsgHdl:
do_el0_svc+0x48/0x58
[ 96.589787] [T00600001343] mtkPowerMsgHdl: el0_svc+0x50/0xd0
[ 96.589791] [T00600001343] mtkPowerMsgHdl:
el0t_64_sync_handler+0x70/0xbc
[ 96.589795] [T00600001343] mtkPowerMsgHdl:
el0t_64_sync+0x188/0x18c
[ 96.589799] [T00600001343] mtkPowerMsgHdl:
[ 96.589799] [T00600001343] -> #3 (cpu_hotplug_lock){++++}-{0:0}:
[ 96.589808] [T00600001343] mtkPowerMsgHdl:
cpus_read_lock+0x54/0x1e8
[ 96.589815] [T00600001343] mtkPowerMsgHdl:
__cpuhp_state_add_instance+0x24/0x54
[ 96.589822] [T00600001343] mtkPowerMsgHdl:
blk_mq_alloc_and_init_hctx+0x940/0xbec
[ 96.589831] [T00600001343] mtkPowerMsgHdl:
blk_mq_realloc_hw_ctxs+0x290/0x9cc
[ 96.589841] [T00600001343] mtkPowerMsgHdl:
blk_mq_init_allocated_queue+0x31c/0x1020
[ 96.589849] [T00600001343] mtkPowerMsgHdl:
__blk_mq_alloc_disk+0x138/0x2b0
[ 96.589855] [T00600001343] mtkPowerMsgHdl:
loop_add+0x2ac/0x840
[ 96.589863] [T00600001343] mtkPowerMsgHdl:
loop_init+0xe8/0x10c
[ 96.589873] [T00600001343] mtkPowerMsgHdl:
do_one_initcall+0x214/0x778
[ 96.589884] [T00600001343] mtkPowerMsgHdl:
do_initcall_level+0x188/0x380
[ 96.589895] [T00600001343] mtkPowerMsgHdl:
do_initcalls+0x74/0x138
[ 96.589903] [T00600001343] mtkPowerMsgHdl:
do_basic_setup+0x78/0x8c
[ 96.589909] [T00600001343] mtkPowerMsgHdl:
kernel_init_freeable+0x260/0x374
[ 96.589916] [T00600001343] mtkPowerMsgHdl:
kernel_init+0x20/0x1cc
[ 96.639355] [T00600001343] mtkPowerMsgHdl:
ret_from_fork+0x10/0x20
[ 96.640209] [T00600001343] mtkPowerMsgHdl:
[ 96.640209] [T00600001343] -> #2 (&q->sysfs_lock){+.+.}-{3:3}:
[ 96.641460] [T00600001343] mtkPowerMsgHdl:
__mutex_lock_common+0x1dc/0x371c
[ 96.642409] [T00600001343] mtkPowerMsgHdl:
mutex_lock_nested+0x2c/0x38
[ 96.643303] [T00600001343] mtkPowerMsgHdl:
blk_mq_realloc_hw_ctxs+0x94/0x9cc
[ 96.644261] [T00600001343] mtkPowerMsgHdl:
blk_mq_init_allocated_queue+0x31c/0x1020
[ 96.645296] [T00600001343] mtkPowerMsgHdl:
blk_mq_alloc_queue+0x130/0x214
[ 96.646222] [T00600001343] mtkPowerMsgHdl:
scsi_alloc_sdev+0x708/0xad4
[ 96.647119] [T00600001343] mtkPowerMsgHdl:
scsi_probe_and_add_lun+0x20c/0x27b4
[ 96.648096] [T00600001343] mtkPowerMsgHdl:
__scsi_add_device+0xec/0x178
[ 96.648103] [T00600001343] mtkPowerMsgHdl:
ufshcd_async_scan+0xd4/0x994
[ 96.651784] [T00600001343] mtkPowerMsgHdl:
async_run_entry_fn+0x90/0x364
[ 96.652697] [T00600001343] mtkPowerMsgHdl:
process_one_work+0x6b8/0x1274
[ 96.652703] [T00600001343] mtkPowerMsgHdl:
worker_thread+0x9d4/0xea0
[ 96.655784] [T00600001343] mtkPowerMsgHdl:
kthread+0x298/0x3d8
[ 96.656595] [T00600001343] mtkPowerMsgHdl:
ret_from_fork+0x10/0x20
[ 96.657449] [T00600001343] mtkPowerMsgHdl:
[ 96.657449] [T00600001343] -> #1 (&shost->scan_mutex){+.+.}-{3:3}:
[ 96.658752] [T00600001343] mtkPowerMsgHdl:
__mutex_lock_common+0x1dc/0x371c
[ 96.659701] [T00600001343] mtkPowerMsgHdl:
mutex_lock_nested+0x2c/0x38
[ 96.660596] [T00600001343] mtkPowerMsgHdl:
ufshcd_devfreq_scale+0xe0/0x3d0 <== here
[ 96.661534] [T00600001343] mtkPowerMsgHdl:
ufshcd_devfreq_target+0x594/0xa08
[ 96.662494] [T00600001343] mtkPowerMsgHdl:
devfreq_set_target+0x188/0x4b4
[ 96.663431] [T00600001343] mtkPowerMsgHdl:
devfreq_update_target+0x144/0x1a0
[ 96.664394] [T00600001343] mtkPowerMsgHdl:
devfreq_monitor+0x40/0x31c <== here
[ 96.665281] [T00600001343] mtkPowerMsgHdl:
process_one_work+0x6b8/0x1274
[ 96.666196] [T00600001343] mtkPowerMsgHdl:
worker_thread+0x9d4/0xea0
[ 96.667069] [T00600001343] mtkPowerMsgHdl:
kthread+0x298/0x3d8
[ 96.667875] [T00600001343] mtkPowerMsgHdl:
ret_from_fork+0x10/0x20
[ 96.668729] [T00600001343] mtkPowerMsgHdl:
[ 96.668729] [T00600001343] -> #0 (&devfreq->lock){+.+.}-{3:3}:
[ 96.669977] [T00600001343] mtkPowerMsgHdl:
__lock_acquire+0x2e10/0x76d0
[ 96.670881] [T00600001343] mtkPowerMsgHdl:
lock_acquire+0x1d0/0x550
[ 96.671740] [T00600001343] mtkPowerMsgHdl:
__mutex_lock_common+0x1dc/0x371c
[ 96.672689] [T00600001343] mtkPowerMsgHdl:
mutex_lock_nested+0x2c/0x38
[ 96.673582] [T00600001343] mtkPowerMsgHdl:
qos_max_notifier_call+0x2c/0x98 <=== here
[ 96.674522] [T00600001343] mtkPowerMsgHdl:
notifier_call_chain+0x128/0x388
[ 96.675460] [T00600001343] mtkPowerMsgHdl:
blocking_notifier_call_chain+0x68/0x94 <=== here
[ 96.676474] [T00600001343] mtkPowerMsgHdl:
pm_qos_update_target+0x3c0/0x5d4
[ 96.677421] [T00600001343] mtkPowerMsgHdl:
freq_qos_apply+0xa8/0xd8
[ 96.678283] [T00600001343] mtkPowerMsgHdl:
apply_constraint+0xa0/0x1a4
[ 96.679178] [T00600001343] mtkPowerMsgHdl:
__dev_pm_qos_update_request+0x1b4/0x340
[ 96.680202] [T00600001343] mtkPowerMsgHdl:
dev_pm_qos_update_request+0x3c/0x60
[ 96.681182] [T00600001343] mtkPowerMsgHdl:
max_freq_store+0xf4/0x130
[ 96.682052] [T00600001343] mtkPowerMsgHdl:
dev_attr_store+0x64/0x84
[ 96.682912] [T00600001343] mtkPowerMsgHdl:
sysfs_kf_write+0x19c/0x224
[ 96.683798] [T00600001343] mtkPowerMsgHdl:
kernfs_fop_write_iter+0x254/0x408
[ 96.684755] [T00600001343] mtkPowerMsgHdl:
vfs_write+0x674/0x954
[ 96.685585] [T00600001343] mtkPowerMsgHdl:
ksys_write+0xdc/0x174
[ 96.686411] [T00600001343] mtkPowerMsgHdl:
__arm64_sys_write+0x78/0x8c
[ 96.687302] [T00600001343] mtkPowerMsgHdl:
invoke_syscall+0x78/0x250
[ 96.688174] [T00600001343] mtkPowerMsgHdl:
el0_svc_common+0x154/0x1c4
[ 96.689056] [T00600001343] mtkPowerMsgHdl:
do_el0_svc+0x48/0x58
[ 96.689872] [T00600001343] mtkPowerMsgHdl: el0_svc+0x50/0xd0
[ 96.690655] [T00600001343] mtkPowerMsgHdl:
el0t_64_sync_handler+0x70/0xbc
[ 96.691579] [T00600001343] mtkPowerMsgHdl:
el0t_64_sync+0x188/0x18c
[ 96.692438] [T00600001343] mtkPowerMsgHdl:
[ 96.692438] [T00600001343] other info that might help us debug this:
[ 96.692438] [T00600001343]
[ 96.694077] [T00600001343] mtkPowerMsgHdl: Chain exists of:
[ 96.694077] [T00600001343] &devfreq->lock --> subsys mutex#2 -->
&(c->notifiers)->rwsem#2
[ 96.694077] [T00600001343]
[ 96.696155] [T00600001343] mtkPowerMsgHdl: Possible unsafe locking
scenario:
[ 96.696155] [T00600001343]
[ 96.697383] [T00600001343] mtkPowerMsgHdl: CPU0
CPU1
[ 96.698284] [T00600001343] mtkPowerMsgHdl: ----
----
[ 96.699184] [T00600001343] mtkPowerMsgHdl: rlock(&(c->notifiers)-
>rwsem#2);
[ 96.700080] [T00600001343] mtkPowerMsgHdl:
lock(subsys mutex#2);
[ 96.701172] [T00600001343] mtkPowerMsgHdl:
lock(&(c->notifiers)->rwsem#2);
[ 96.702371] [T00600001343] mtkPowerMsgHdl: lock(&devfreq->lock);
[ 96.703145] [T00600001343] mtkPowerMsgHdl:
[ 96.703145] [T00600001343] *** DEADLOCK ***
[ 96.703145] [T00600001343]
[ 96.704524] [T00600001343] mtkPowerMsgHdl: 6 locks held by
mtkPowerMsgHdl/1343:
[ 96.705440] [T00600001343] mtkPowerMsgHdl: #0: ffffff8089ee64f8
(&f->f_pos_lock){+.+.}-{3:3}, at: fdget_pos+0x1a4/0x228
[ 96.706816] [T00600001343] mtkPowerMsgHdl: #1: ffffff803b5ba450
(sb_writers#4){.+.+}-{0:0}, at: vfs_write+0x1f4/0x954
[ 96.708166] [T00600001343] mtkPowerMsgHdl: #2: ffffff80f817fc88
(&of->mutex#2){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x170/0x408
[ 96.709652] [T00600001343] mtkPowerMsgHdl: #3: ffffff804558b840
(kn->active#203){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x18c/0x408
[ 96.711165] [T00600001343] mtkPowerMsgHdl: #4: ffffffc0849ad6a8
(dev_pm_qos_mtx){+.+.}-{3:3}, at: dev_pm_qos_update_request+0x30/0x60
[ 96.712691] [T00600001343] mtkPowerMsgHdl: #5: ffffff804584b9c8
(&(c->notifiers)->rwsem#2){++++}-{3:3}, at:
blocking_notifier_call_chain+0x50/0x94
[ 96.714361] [T00600001343] mtkPowerMsgHdl:
[ 96.714361] [T00600001343] stack backtrace:
[ 96.715401] [T00600001343] mtkPowerMsgHdl: CPU: 6 UID: 0 PID: 1343
Comm: mtkPowerMsgHdl Tainted: G W OE 6.12.30-android16-5-
g137b86aeb5da-4k #1 bfd83f66acc4211b86b2132db3b8eb1c0982822d
[ 96.715416] [T00600001343] mtkPowerMsgHdl: Tainted: [W]=WARN,
[O]=OOT_MODULE, [E]=UNSIGNED_MODULE
[ 96.715419] [T00600001343] mtkPowerMsgHdl: Hardware name:
MT6993(ENG) (DT)
[ 96.715425] [T00600001343] mtkPowerMsgHdl: Call trace:
[ 96.715428] [T00600001343] mtkPowerMsgHdl:
dump_backtrace+0xfc/0x178
[ 96.715437] [T00600001343] mtkPowerMsgHdl: show_stack+0x18/0x24
[ 96.715444] [T00600001343] mtkPowerMsgHdl: dump_stack_lvl+0x40/0x9c
[ 96.715450] [T00600001343] mtkPowerMsgHdl: dump_stack+0x18/0x24
[ 96.715456] [T00600001343] mtkPowerMsgHdl:
print_circular_bug+0x14c/0x1b8
[ 96.715462] [T00600001343] mtkPowerMsgHdl:
check_noncircular+0x24c/0x328
[ 96.715467] [T00600001343] mtkPowerMsgHdl:
__lock_acquire+0x2e10/0x76d0
[ 96.715471] [T00600001343] mtkPowerMsgHdl: lock_acquire+0x1d0/0x550
[ 96.715474] [T00600001343] mtkPowerMsgHdl:
__mutex_lock_common+0x1dc/0x371c
[ 96.715481] [T00600001343] mtkPowerMsgHdl:
mutex_lock_nested+0x2c/0x38
[ 96.715487] [T00600001343] mtkPowerMsgHdl:
qos_max_notifier_call+0x2c/0x98
[ 96.715494] [T00600001343] mtkPowerMsgHdl:
notifier_call_chain+0x128/0x388
[ 96.715500] [T00600001343] mtkPowerMsgHdl:
blocking_notifier_call_chain+0x68/0x94
[ 96.715506] [T00600001343] mtkPowerMsgHdl:
pm_qos_update_target+0x3c0/0x5d4
[ 96.715512] [T00600001343] mtkPowerMsgHdl: freq_qos_apply+0xa8/0xd8
[ 96.715517] [T00600001343] mtkPowerMsgHdl:
apply_constraint+0xa0/0x1a4
[ 96.715522] [T00600001343] mtkPowerMsgHdl:
__dev_pm_qos_update_request+0x1b4/0x340
[ 96.715526] [T00600001343] mtkPowerMsgHdl:
dev_pm_qos_update_request+0x3c/0x60
[ 96.715530] [T00600001343] mtkPowerMsgHdl:
max_freq_store+0xf4/0x130
[ 96.715535] [T00600001343] mtkPowerMsgHdl: dev_attr_store+0x64/0x84
[ 96.715538] [T00600001343] mtkPowerMsgHdl:
sysfs_kf_write+0x19c/0x224
[ 96.715545] [T00600001343] mtkPowerMsgHdl:
kernfs_fop_write_iter+0x254/0x408
[ 96.715550] [T00600001343] mtkPowerMsgHdl: vfs_write+0x674/0x954
[ 96.715554] [T00600001343] mtkPowerMsgHdl: ksys_write+0xdc/0x174
[ 96.715557] [T00600001343] mtkPowerMsgHdl:
__arm64_sys_write+0x78/0x8c
[ 96.715561] [T00600001343] mtkPowerMsgHdl:
invoke_syscall+0x78/0x250
[ 96.715566] [T00600001343] mtkPowerMsgHdl:
el0_svc_common+0x154/0x1c4
[ 96.715571] [T00600001343] mtkPowerMsgHdl: do_el0_svc+0x48/0x58
[ 96.715577] [T00600001343] mtkPowerMsgHdl: el0_svc+0x50/0xd0
[ 96.715581] [T00600001343] mtkPowerMsgHdl:
el0t_64_sync_handler+0x70/0xbc
[ 96.715585] [T00600001343] mtkPowerMsgHdl: el0t_64_sync+0x188/0x18c
Thansk.
Peter
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