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
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acpi-cpufreq.c
amd_freq_sensitivity.c
arm_big_little.c
arm_big_little.h
armada-8k-cpufreq.c
armada-37xx-cpufreq.c
bmips-cpufreq.c
brcmstb-avs-cpufreq.c
cppc_cpufreq.c
cpufreq_conservative.c
cpufreq_governor_attr_set.c
cpufreq_governor.c
cpufreq_governor.h
cpufreq_ondemand.c
cpufreq_ondemand.h
cpufreq_performance.c
cpufreq_powersave.c
cpufreq_stats.c
cpufreq_userspace.c
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
cpufreq-dt.h
cpufreq-nforce2.c
cpufreq.c	cpufreq: Cancel policy update work scheduled before freeing	2019-10-22 18:07:30 +02:00
davinci-cpufreq.c
e_powersaver.c
elanfreq.c
freq_table.c
gx-suspmod.c
highbank-cpufreq.c
ia64-acpi-cpufreq.c
imx6q-cpufreq.c
imx-cpufreq-dt.c
intel_pstate.c	cpufreq: Use per-policy frequency QoS	2019-10-21 02:05:21 +02:00
Kconfig
Kconfig.arm	Merge branch 'cpufreq/qcom-updates' into cpufreq/arm/linux-next	2019-09-03 07:55:22 +05:30
Kconfig.powerpc
Kconfig.x86
kirkwood-cpufreq.c
longhaul.c
longhaul.h
longrun.c
loongson1-cpufreq.c
loongson2_cpufreq.c
Makefile	Merge branch 'cpufreq/qcom-updates' into cpufreq/arm/linux-next	2019-09-03 07:55:22 +05:30
maple-cpufreq.c
mediatek-cpufreq.c
mvebu-cpufreq.c
omap-cpufreq.c
p4-clockmod.c
pasemi-cpufreq.c
pcc-cpufreq.c
pmac32-cpufreq.c
pmac64-cpufreq.c
powernow-k6.c
powernow-k7.c
powernow-k7.h
powernow-k8.c
powernow-k8.h
powernv-cpufreq.c
ppc_cbe_cpufreq_pervasive.c
ppc_cbe_cpufreq_pmi.c	cpufreq: Use per-policy frequency QoS	2019-10-21 02:05:21 +02:00
ppc_cbe_cpufreq.c
ppc_cbe_cpufreq.h
pxa2xx-cpufreq.c
pxa3xx-cpufreq.c
qcom-cpufreq-hw.c
qcom-cpufreq-nvmem.c	cpufreq: qcom: Add support for qcs404 on nvmem driver	2019-09-03 07:55:00 +05:30
qoriq-cpufreq.c
raspberrypi-cpufreq.c
s3c24xx-cpufreq-debugfs.c
s3c24xx-cpufreq.c
s3c64xx-cpufreq.c
s3c2410-cpufreq.c
s3c2412-cpufreq.c
s3c2416-cpufreq.c
s3c2440-cpufreq.c
s5pv210-cpufreq.c
sa1100-cpufreq.c
sa1110-cpufreq.c
sc520_freq.c
scmi-cpufreq.c
scpi-cpufreq.c
sfi-cpufreq.c
sh-cpufreq.c
sparc-us2e-cpufreq.c
sparc-us3-cpufreq.c
spear-cpufreq.c
speedstep-centrino.c
speedstep-ich.c
speedstep-lib.c
speedstep-lib.h
speedstep-smi.c
sti-cpufreq.c
sun50i-cpufreq-nvmem.c
tango-cpufreq.c
tegra20-cpufreq.c
tegra124-cpufreq.c
tegra186-cpufreq.c
ti-cpufreq.c
unicore2-cpufreq.c
vexpress-spc-cpufreq.c