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linux/drivers/cpufreq
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Viresh Kumar 5f44e3971f cpufreq: Schedule work for the first-online CPU on resume 
[ Upstream commit c75de0ac07 ]

All CPUs leaving the first-online CPU are hotplugged out on suspend and
and cpufreq core stops managing them.

On resume, we need to call cpufreq_update_policy() for this CPU's policy
to make sure its frequency is in sync with cpufreq's cached value, as it
might have got updated by hardware during suspend/resume.

The policies are always added to the top of the policy-list. So, in
normal circumstances, CPU 0's policy will be the last one in the list.
And so the code checks for the last policy.

But there are cases where it will fail. Consider quad-core system, with
policy-per core. If CPU0 is hotplugged out and added back again, the
last policy will be on CPU1 :(

To fix this in a proper way, always look for the policy of the first
online CPU. That way we will be sure that we are calling
cpufreq_update_policy() for the only CPU that wasn't hotplugged out.

Cc: 3.15+ <stable@vger.kernel.org> # 3.15+
Fixes: 2f0aea9363 ("cpufreq: suspend governors on system suspend/hibernate")
Reported-by: Saravana Kannan <skannan@codeaurora.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Acked-by: Saravana Kannan <skannan@codeaurora.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
History 2015-04-24 17:13:44 -04:00
..
acpi-cpufreq.c cpufreq: Use cpufreq_for_each_* macros for frequency table iteration 2014-04-30 00:06:21 +02:00
amd_freq_sensitivity.c cpufreq: AMD "frequency sensitivity feedback" powersave bias for ondemand governor 2013-04-10 13:19:26 +02:00
arm_big_little.c cpufreq: arm_big_little: fix module license spec 2014-08-09 02:43:33 +02:00
arm_big_little.h cpufreq: arm_big_little: add in-kernel switching (IKS) support 2013-10-31 00:10:53 +01:00
arm_big_little_dt.c cpufreq: arm_big_little: fix module license spec 2014-08-09 02:43:33 +02:00
at32ap-cpufreq.c cpufreq: at32ap: don't declare local variable as static 2014-04-07 14:31:33 +02:00
blackfin-cpufreq.c cpufreq: Remove cpufreq_generic_exit() 2014-03-12 01:06:00 +01:00
cpufreq-dt.c cpufreq: cpufreq-dt: Fix arguments in clock failure error message 2014-11-05 20:51:21 +01:00
cpufreq-nforce2.c cpufreq: nforce2: remove DEFINE_PCI_DEVICE_TABLE macro 2014-05-17 01:16:15 +02:00
cpufreq.c cpufreq: Schedule work for the first-online CPU on resume 2015-04-24 17:13:44 -04:00
cpufreq_conservative.c cpufreq: conservative: set requested_freq to policy max when it is over policy max 2013-11-12 23:18:20 +01:00
cpufreq_governor.c cpufreq: governor: remove copy_prev_load from 'struct cpu_dbs_common_info' 2014-06-09 12:58:21 +02:00
cpufreq_governor.h cpufreq: governor: remove copy_prev_load from 'struct cpu_dbs_common_info' 2014-06-09 12:58:21 +02:00
cpufreq_ondemand.c cpufreq: ondemand: Eliminate the deadband effect 2014-07-21 13:43:19 +02:00
cpufreq_opp.c cpufreq / OPP: Fix the order of arguments for kcalloc() 2014-09-08 00:02:58 +02:00
cpufreq_performance.c cpufreq: Clean up header files included in the core 2013-08-07 23:34:09 +02:00
cpufreq_powersave.c cpufreq: Clean up header files included in the core 2013-08-07 23:34:09 +02:00
cpufreq_stats.c cpufreq: Use cpufreq_for_each_* macros for frequency table iteration 2014-04-30 00:06:21 +02:00
cpufreq_userspace.c cpufreq / governor: Remove fossil comment 2013-10-17 23:00:20 +02:00
cris-artpec3-cpufreq.c cpufreq: create another field .flags in cpufreq_frequency_table 2014-04-07 14:43:50 +02:00
cris-etraxfs-cpufreq.c cpufreq: create another field .flags in cpufreq_frequency_table 2014-04-07 14:43:50 +02:00
davinci-cpufreq.c cpufreq: Remove cpufreq_generic_exit() 2014-03-12 01:06:00 +01:00
dbx500-cpufreq.c cpufreq: Use cpufreq_for_each_* macros for frequency table iteration 2014-04-30 00:06:21 +02:00
e_powersaver.c cpufreq: add 'freq_table' in struct cpufreq_policy 2014-03-12 01:06:00 +01:00
elanfreq.c cpufreq: Use cpufreq_for_each_* macros for frequency table iteration 2014-04-30 00:06:21 +02:00
exynos-cpufreq.c ACPI and power management updates for 3.16-rc1 2014-06-04 08:57:16 -07:00
exynos-cpufreq.h ACPI and power management updates for 3.16-rc1 2014-06-04 08:57:16 -07:00
exynos4x12-cpufreq.c cpufreq: cpu0: rename driver and internals to 'cpufreq_dt' 2014-10-03 15:37:54 +02:00
exynos4210-cpufreq.c cpufreq: cpu0: rename driver and internals to 'cpufreq_dt' 2014-10-03 15:37:54 +02:00
exynos5250-cpufreq.c cpufreq: cpu0: rename driver and internals to 'cpufreq_dt' 2014-10-03 15:37:54 +02:00
exynos5440-cpufreq.c cpufreq: Use cpufreq_for_each_* macros for frequency table iteration 2014-04-30 00:06:21 +02:00
freq_table.c cpufreq: Introduce new relation for freq selection 2014-07-21 13:43:19 +02:00
gx-suspmod.c cpufreq: Convert existing drivers to use cpufreq_freq_transition_{begin|end} 2014-03-26 16:41:41 +01:00
highbank-cpufreq.c Merge branch 'mailbox-for-linus' of git://git.linaro.org/landing-teams/working/fujitsu/integration 2014-10-21 11:21:19 -07:00
ia64-acpi-cpufreq.c cpufreq: use kzalloc() to allocate memory for cpufreq_frequency_table 2014-04-07 14:43:49 +02:00
imx6q-cpufreq.c cpufreq: imx6: remove pu regulator dependency for SOCs with no PU regulator 2014-07-21 13:43:19 +02:00
integrator-cpufreq.c cpufreq: integrator: fix integrator_cpufreq_remove return type 2014-09-29 15:36:03 +02:00
intel_pstate.c intel_pstate: Correct BYT VID values. 2014-10-23 23:00:00 +02:00
Kconfig cpufreq: cpu0: rename driver and internals to 'cpufreq_dt' 2014-10-03 15:37:54 +02:00
Kconfig.arm ACPI and power management updates for 3.18-rc1 2014-10-09 16:07:43 -04:00
Kconfig.powerpc cpufreq: powernv: cpufreq driver for powernv platform 2014-04-07 14:35:27 +02:00
Kconfig.x86 cpufreq: Kconfig: Fix spelling errors 2014-05-01 01:18:19 +02:00
kirkwood-cpufreq.c cpufreq: kirkwood: use the powersave multiplexer 2014-09-02 15:02:54 -07:00
longhaul.c Merge branch 'cpufreq-macros' into pm-cpufreq 2014-05-01 00:50:47 +02:00
longhaul.h cpufreq: delete __cpuinit usage from all cpufreq files 2013-07-14 19:36:57 -04:00
longrun.c cpufreq: add new routine cpufreq_verify_within_cpu_limits() 2013-10-16 00:50:23 +02:00
loongson2_cpufreq.c MIPS: Loongson: Modify ChipConfig register definition 2014-07-30 21:46:00 +02:00
Makefile cpufreq: cpu0: rename driver and internals to 'cpufreq_dt' 2014-10-03 15:37:54 +02:00
maple-cpufreq.c cpufreq: create another field .flags in cpufreq_frequency_table 2014-04-07 14:43:50 +02:00
omap-cpufreq.c cpufreq: add 'freq_table' in struct cpufreq_policy 2014-03-12 01:06:00 +01:00
p4-clockmod.c cpufreq: create another field .flags in cpufreq_frequency_table 2014-04-07 14:43:50 +02:00
pasemi-cpufreq.c cpufreq: Use cpufreq_for_each_* macros for frequency table iteration 2014-04-30 00:06:21 +02:00
pcc-cpufreq.c cpufreq: pcc-cpufreq: Fix wait_event() under spinlock 2014-09-29 15:35:50 +02:00
pmac32-cpufreq.c powerpc: Remove powerpc specific cmd_line 2014-10-02 17:33:55 +10:00
pmac64-cpufreq.c of: Migrate of_find_node_by_name() users to for_each_node_by_name() 2014-06-26 17:12:24 +01:00
powernow-k6.c powernow-k6: support 350MHz CPU 2014-07-21 13:43:19 +02:00
powernow-k7.c cpufreq: powernow-k7: Fix double invocation of cpufreq_freq_transition_begin/end 2014-04-29 01:22:54 +02:00
powernow-k7.h [CPUFREQ] Move x86 drivers to drivers/cpufreq/ 2011-05-19 18:51:07 -04:00
powernow-k8.c cpufreq: powernow-k8: Suppress checkpatch warnings 2014-05-17 01:27:01 +02:00
powernow-k8.h cpufreq: powernow-k8: Suppress checkpatch warnings 2014-05-17 01:27:01 +02:00
powernv-cpufreq.c cpufreq: powernv: Set the cpus to nominal frequency during reboot/kexec 2014-09-29 15:53:04 +02:00
ppc-corenet-cpufreq.c cpufreq: ppc-corenet: remove duplicate update of cpu_data 2014-09-30 21:09:40 +02:00
ppc_cbe_cpufreq.c cpufreq: Use cpufreq_for_each_* macros for frequency table iteration 2014-04-30 00:06:21 +02:00
ppc_cbe_cpufreq.h cpufreq: powerpc/platforms/cell: move cpufreq driver to drivers/cpufreq 2013-04-10 13:19:26 +02:00
ppc_cbe_cpufreq_pervasive.c cpufreq: powerpc/platforms/cell: move cpufreq driver to drivers/cpufreq 2013-04-10 13:19:26 +02:00
ppc_cbe_cpufreq_pmi.c cpufreq: powerpc/platforms/cell: move cpufreq driver to drivers/cpufreq 2013-04-10 13:19:26 +02:00
pxa2xx-cpufreq.c cpufreq: Remove cpufreq_generic_exit() 2014-03-12 01:06:00 +01:00
pxa3xx-cpufreq.c cpufreq: Remove cpufreq_generic_exit() 2014-03-12 01:06:00 +01:00
s3c24xx-cpufreq-debugfs.c cpufreq: s3c24xx: move cpufreq driver to drivers/cpufreq 2013-05-20 23:04:28 +09:00
s3c24xx-cpufreq.c cpufreq: s3c: remove last use of resume_clocks callback 2015-03-06 14:52:48 -08:00
s3c64xx-cpufreq.c cpufreq: Use cpufreq_for_each_* macros for frequency table iteration 2014-04-30 00:06:21 +02:00
s3c2410-cpufreq.c cpufreq: s3c24xx: Remove some dead code 2014-07-19 04:24:59 +09:00
s3c2412-cpufreq.c cpufreq: s3c24xx: Remove some dead code 2014-07-19 04:24:59 +09:00
s3c2416-cpufreq.c cpufreq: s3c: remove incorrect __init annotations 2015-03-06 14:52:48 -08:00
s3c2440-cpufreq.c cpufreq: s3c24xx: Remove some dead code 2014-07-19 04:24:59 +09:00
s5pv210-cpufreq.c cpufreq: cpu0: rename driver and internals to 'cpufreq_dt' 2014-10-03 15:37:54 +02:00
sa1100-cpufreq.c cpufreq: Mark ARM drivers with CPUFREQ_NEED_INITIAL_FREQ_CHECK flag 2014-01-06 14:17:25 +01:00
sa1110-cpufreq.c cpufreq: sa1110: set memory type for h3600 2014-07-16 14:30:17 +02:00
sc520_freq.c cpufreq: create another field .flags in cpufreq_frequency_table 2014-04-07 14:43:50 +02:00
sh-cpufreq.c cpufreq: Convert existing drivers to use cpufreq_freq_transition_{begin|end} 2014-03-26 16:41:41 +01:00
sparc-us2e-cpufreq.c cpufreq: add 'freq_table' in struct cpufreq_policy 2014-03-12 01:06:00 +01:00
sparc-us3-cpufreq.c cpufreq: add 'freq_table' in struct cpufreq_policy 2014-03-12 01:06:00 +01:00
spear-cpufreq.c cpufreq: use kzalloc() to allocate memory for cpufreq_frequency_table 2014-04-07 14:43:49 +02:00
speedstep-centrino.c cpufreq: Make linux-pm@vger.kernel.org official mailing list 2014-05-01 01:15:32 +02:00
speedstep-ich.c cpufreq: create another field .flags in cpufreq_frequency_table 2014-04-07 14:43:50 +02:00
speedstep-lib.c cpufreq: speedstep-smi: enable interrupts when waiting 2015-03-06 14:52:48 -08:00
speedstep-lib.h [CPUFREQ] Move x86 drivers to drivers/cpufreq/ 2011-05-19 18:51:07 -04:00
speedstep-smi.c cpufreq: speedstep-smi: enable interrupts when waiting 2015-03-06 14:52:48 -08:00
tegra-cpufreq.c cpufreq: tegra: update comment for clarity 2014-06-10 22:50:50 +02:00
unicore2-cpufreq.c cpufreq: unicore32: replace IS_ERR and PTR_ERR with PTR_ERR_OR_ZERO 2014-04-21 23:42:27 +02:00
vexpress-spc-cpufreq.c cpufreq: arm_big_little: add vexpress SPC interface driver 2013-10-30 00:48:26 +01:00