Rafael J. Wysocki 65650b3513 cpufreq: Avoid cpufreq_suspend() deadlock on system shutdown ... It is incorrect to set the cpufreq syscore shutdown callback pointer to cpufreq_suspend(), because that function cannot be run in the syscore stage of system shutdown for two reasons: (a) it may attempt to carry out actions depending on devices that have already been shut down at that point and (b) the RCU synchronization carried out by it may not be able to make progress then. The latter issue has been present since commit 45975c7d21 ("rcu: Define RCU-sched API in terms of RCU for Tree RCU PREEMPT builds"), but the former one has been there since commit 90de2a4aa9 ("cpufreq: suspend cpufreq governors on shutdown") regardless. Fix that by dropping cpufreq_syscore_ops altogether and making device_shutdown() call cpufreq_suspend() directly before shutting down devices, which is along the lines of what system-wide power management does. Fixes: 45975c7d21 ("rcu: Define RCU-sched API in terms of RCU for Tree RCU PREEMPT builds") Fixes: 90de2a4aa9 ("cpufreq: suspend cpufreq governors on shutdown") Reported-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Tested-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Cc: 4.0+ <stable@vger.kernel.org> # 4.0+		2019-10-10 11:11:17 +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	cpufreq: ap806: Add NULL check after kcalloc	2019-07-22 11:12:15 +05:30
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: Avoid cpufreq_suspend() deadlock on system shutdown	2019-10-10 11:11:17 +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	cpufreq: imx-cpufreq-dt: Add i.MX8MN support	2019-08-22 11:31:04 +05:30
intel_pstate.c	Power management updates for 5.4-rc1	2019-09-17 19:15:14 -07:00
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	cpufreq: mediatek: Add support for mt8183	2019-08-22 11:31:04 +05:30
mvebu-cpufreq.c
omap-cpufreq.c
p4-clockmod.c
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
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: powerpc_cbe: Switch to QoS requests for freq limits	2019-08-26 10:02:01 +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
pxa3xx-cpufreq.c
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
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	cpufreq: ti-cpufreq: Mark expected switch fall-through	2019-07-30 08:10:45 +05:30
unicore2-cpufreq.c
vexpress-spc-cpufreq.c