Sudeep Holla 6941051d30 cpufreq: Cancel policy update work scheduled before freeing ... Scheduled policy update work may end up racing with the freeing of the policy and unregistering the driver. One possible race is as below, where the cpufreq_driver is unregistered, but the scheduled work gets executed at later stage when, cpufreq_driver is NULL (i.e. after freeing the policy and driver). Unable to handle kernel NULL pointer dereference at virtual address 0000001c pgd = (ptrval) [0000001c] *pgd=80000080204003, *pmd=00000000 Internal error: Oops: 206 [#1] SMP THUMB2 Modules linked in: CPU: 0 PID: 34 Comm: kworker/0:1 Not tainted 5.4.0-rc3-00006-g67f5a8081a4b #86 Hardware name: ARM-Versatile Express Workqueue: events handle_update PC is at cpufreq_set_policy+0x58/0x228 LR is at dev_pm_qos_read_value+0x77/0xac Control: 70c5387d Table: 80203000 DAC: fffffffd Process kworker/0:1 (pid: 34, stack limit = 0x(ptrval)) (cpufreq_set_policy) from (refresh_frequency_limits.part.24+0x37/0x48) (refresh_frequency_limits.part.24) from (handle_update+0x2f/0x38) (handle_update) from (process_one_work+0x16d/0x3cc) (process_one_work) from (worker_thread+0xff/0x414) (worker_thread) from (kthread+0xff/0x100) (kthread) from (ret_from_fork+0x11/0x28) Fixes: 67d874c3b2 ("cpufreq: Register notifiers with the PM QoS framework") Signed-off-by: Sudeep Holla <sudeep.holla@arm.com> [ rjw: Cancel the work before dropping the QoS requests ] Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>		2019-10-22 18:07:30 +02:00
..
acpi-cpufreq.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156	2019-05-30 11:26:35 -07:00
amd_freq_sensitivity.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500	2019-06-19 17:09:55 +02:00
arm_big_little.c	cpufreq: arm_big_little: Register an Energy Model	2019-02-07 09:55:11 +05:30
arm_big_little.h	cpufreq: arm_big_little: make function arguments and structure pointer const	2017-11-08 23:22:19 +01:00
armada-8k-cpufreq.c	cpufreq: ap806: Add NULL check after kcalloc	2019-07-22 11:12:15 +05:30
armada-37xx-cpufreq.c	cpufreq: armada-37xx: Remove set but not used variable 'freq'	2019-06-03 11:26:38 +05:30
bmips-cpufreq.c	cpufreq: Make cpufreq_generic_init() return void	2019-07-16 10:20:11 +02:00
brcmstb-avs-cpufreq.c	cpufreq: brcmstb-avs-cpufreq: Fix types for voltage/frequency	2019-06-04 09:31:41 +05:30
cppc_cpufreq.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 441	2019-06-05 17:37:17 +02:00
cpufreq_conservative.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500	2019-06-19 17:09:55 +02:00
cpufreq_governor_attr_set.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500	2019-06-19 17:09:55 +02:00
cpufreq_governor.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500	2019-06-19 17:09:55 +02:00
cpufreq_governor.h	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500	2019-06-19 17:09:55 +02:00
cpufreq_ondemand.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500	2019-06-19 17:09:55 +02:00
cpufreq_ondemand.h	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500	2019-06-19 17:09:55 +02:00
cpufreq_performance.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500	2019-06-19 17:09:55 +02:00
cpufreq_powersave.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500	2019-06-19 17:09:55 +02:00
cpufreq_stats.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500	2019-06-19 17:09:55 +02:00
cpufreq_userspace.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500	2019-06-19 17:09:55 +02:00
cpufreq-dt-platdev.c	Merge branch 'cpufreq/qcom-updates' into cpufreq/arm/linux-next	2019-09-03 07:55:22 +05:30
cpufreq-dt.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500	2019-06-19 17:09:55 +02:00
cpufreq-dt.h	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500	2019-06-19 17:09:55 +02:00
cpufreq-nforce2.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 166	2019-05-30 11:26:39 -07:00
cpufreq.c	cpufreq: Cancel policy update work scheduled before freeing	2019-10-22 18:07:30 +02:00
davinci-cpufreq.c	Merge branch 'pm-cpufreq'	2019-07-18 09:49:30 +02:00
e_powersaver.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 166	2019-05-30 11:26:39 -07:00
elanfreq.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152	2019-05-30 11:26:32 -07:00
freq_table.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500	2019-06-19 17:09:55 +02:00
gx-suspmod.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500	2019-06-19 17:09:55 +02:00
highbank-cpufreq.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500	2019-06-19 17:09:55 +02:00
ia64-acpi-cpufreq.c	treewide: Add SPDX license identifier for more missed files	2019-05-21 10:50:45 +02:00
imx6q-cpufreq.c	Merge branch 'pm-cpufreq'	2019-07-18 09:49:30 +02:00
imx-cpufreq-dt.c	cpufreq: imx-cpufreq-dt: Add i.MX8MN support	2019-08-22 11:31:04 +05:30
intel_pstate.c	cpufreq: Use per-policy frequency QoS	2019-10-21 02:05:21 +02:00
Kconfig	treewide: Add SPDX license identifier - Makefile/Kconfig	2019-05-21 10:50:46 +02:00
Kconfig.arm	Merge branch 'cpufreq/qcom-updates' into cpufreq/arm/linux-next	2019-09-03 07:55:22 +05:30
Kconfig.powerpc	treewide: Add SPDX license identifier - Makefile/Kconfig	2019-05-21 10:50:46 +02:00
Kconfig.x86	treewide: Add SPDX license identifier - Makefile/Kconfig	2019-05-21 10:50:46 +02:00
kirkwood-cpufreq.c	cpufreq: Make cpufreq_generic_init() return void	2019-07-16 10:20:11 +02:00
longhaul.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 166	2019-05-30 11:26:39 -07:00
longhaul.h	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 166	2019-05-30 11:26:39 -07:00
longrun.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 166	2019-05-30 11:26:39 -07:00
loongson1-cpufreq.c	cpufreq: Make cpufreq_generic_init() return void	2019-07-16 10:20:11 +02:00
loongson2_cpufreq.c	cpufreq: Make cpufreq_generic_init() return void	2019-07-16 10:20:11 +02:00
Makefile	Merge branch 'cpufreq/qcom-updates' into cpufreq/arm/linux-next	2019-09-03 07:55:22 +05:30
maple-cpufreq.c	Merge branch 'pm-cpufreq'	2019-07-18 09:49:30 +02:00
mediatek-cpufreq.c	cpufreq: mediatek: Add support for mt8183	2019-08-22 11:31:04 +05:30
mvebu-cpufreq.c	cpufreq: mvebu: Remove OPPs using dev_pm_opp_remove()	2018-09-19 14:56:44 -07:00
omap-cpufreq.c	Merge branch 'pm-cpufreq'	2019-07-18 09:49:30 +02:00
p4-clockmod.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152	2019-05-30 11:26:32 -07:00
pasemi-cpufreq.c	cpufreq/pasemi: fix use-after-free in pas_cpufreq_cpu_init()	2019-07-23 09:49:10 +02:00
pcc-cpufreq.c	cpufreq: pcc-cpufreq: Fail initialization if driver cannot be registered	2019-06-17 12:25:30 +02:00
pmac32-cpufreq.c	Merge branch 'pm-cpufreq'	2019-07-18 09:49:30 +02:00
pmac64-cpufreq.c	Merge branch 'pm-cpufreq'	2019-07-18 09:49:30 +02:00
powernow-k6.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 166	2019-05-30 11:26:39 -07:00
powernow-k7.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 166	2019-05-30 11:26:39 -07:00
powernow-k7.h	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 166	2019-05-30 11:26:39 -07:00
powernow-k8.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 166	2019-05-30 11:26:39 -07:00
powernow-k8.h	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 347	2019-06-05 17:37:08 +02:00
powernv-cpufreq.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 118	2019-05-24 17:39:02 +02:00
ppc_cbe_cpufreq_pervasive.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 153	2019-05-30 11:26:32 -07:00
ppc_cbe_cpufreq_pmi.c	cpufreq: Use per-policy frequency QoS	2019-10-21 02:05:21 +02:00
ppc_cbe_cpufreq.c	cpufreq: powerpc_cbe: Switch to QoS requests for freq limits	2019-08-26 10:02:01 +02:00
ppc_cbe_cpufreq.h	cpufreq: powerpc_cbe: Switch to QoS requests for freq limits	2019-08-26 10:02:01 +02:00
pxa2xx-cpufreq.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156	2019-05-30 11:26:35 -07:00
pxa3xx-cpufreq.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152	2019-05-30 11:26:32 -07:00
qcom-cpufreq-hw.c	cpufreq: qcom-hw: invoke frequency-invariance setter function	2019-08-22 11:31:04 +05:30
qcom-cpufreq-nvmem.c	cpufreq: qcom: Add support for qcs404 on nvmem driver	2019-09-03 07:55:00 +05:30
qoriq-cpufreq.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500	2019-06-19 17:09:55 +02:00
raspberrypi-cpufreq.c	cpufreq: add driver for Raspberry Pi	2019-06-13 08:58:22 +05:30
s3c24xx-cpufreq-debugfs.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500	2019-06-19 17:09:55 +02:00
s3c24xx-cpufreq.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500	2019-06-19 17:09:55 +02:00
s3c64xx-cpufreq.c	Merge branch 'pm-cpufreq'	2019-07-18 09:49:30 +02:00
s3c2410-cpufreq.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500	2019-06-19 17:09:55 +02:00
s3c2412-cpufreq.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500	2019-06-19 17:09:55 +02:00
s3c2416-cpufreq.c	Merge branch 'pm-cpufreq'	2019-07-18 09:49:30 +02:00
s3c2440-cpufreq.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500	2019-06-19 17:09:55 +02:00
s5pv210-cpufreq.c	Merge branch 'pm-cpufreq'	2019-07-18 09:49:30 +02:00
sa1100-cpufreq.c	cpufreq: Make cpufreq_generic_init() return void	2019-07-16 10:20:11 +02:00
sa1110-cpufreq.c	Merge branch 'pm-cpufreq'	2019-07-18 09:49:30 +02:00
sc520_freq.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152	2019-05-30 11:26:32 -07:00
scmi-cpufreq.c	Merge branch 'pm-opp'	2019-03-04 11:19:14 +01:00
scpi-cpufreq.c	cpufreq: scpi: Fix use after free	2019-03-28 11:14:31 +01:00
sfi-cpufreq.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 235	2019-06-19 17:09:07 +02:00
sh-cpufreq.c	cpufreq: sh: Don't validate the frequency table twice	2018-03-20 12:07:52 +01:00
sparc-us2e-cpufreq.c	treewide: Add SPDX license identifier for more missed files	2019-05-21 10:50:45 +02:00
sparc-us3-cpufreq.c	treewide: Add SPDX license identifier for more missed files	2019-05-21 10:50:45 +02:00
spear-cpufreq.c	cpufreq: Make cpufreq_generic_init() return void	2019-07-16 10:20:11 +02:00
speedstep-centrino.c	treewide: Add SPDX license identifier for more missed files	2019-05-21 10:50:45 +02:00
speedstep-ich.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 166	2019-05-30 11:26:39 -07:00
speedstep-lib.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 166	2019-05-30 11:26:39 -07:00
speedstep-lib.h	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 166	2019-05-30 11:26:39 -07:00
speedstep-smi.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 166	2019-05-30 11:26:39 -07:00
sti-cpufreq.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 312	2019-06-05 17:37:04 +02:00
sun50i-cpufreq-nvmem.c	cpufreq: Add sun50i nvmem based CPU scaling driver	2019-07-22 11:10:51 +05:30
tango-cpufreq.c	cpufreq: dt: Don't use generic platdev driver for tango	2017-07-22 02:20:59 +02:00
tegra20-cpufreq.c	cpufreq: Make cpufreq_generic_init() return void	2019-07-16 10:20:11 +02:00
tegra124-cpufreq.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282	2019-06-05 17:36:37 +02:00
tegra186-cpufreq.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 288	2019-06-05 17:36:37 +02:00
ti-cpufreq.c	cpufreq: ti-cpufreq: Mark expected switch fall-through	2019-07-30 08:10:45 +05:30
unicore2-cpufreq.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500	2019-06-19 17:09:55 +02:00
vexpress-spc-cpufreq.c	cpufreq: arm_big_little: make cpufreq_arm_bL_ops structures const	2017-11-08 23:22:20 +01:00