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mirror-linux/drivers/cpufreq
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K Prateek Nayak df488cac61 cpufreq/amd-pstate-ut: Disable dynamic_epp after the mode switch 
Dan reported a possible NULL pointer dereference in amd-pstate-ut.c from
static analysis and sure enough, running amd-pstate-ut in active mode
with amd_dynamic_epp=enable results in a crash as a reult of the policy
reference being set to NULL early, before disabling dynamic EPP.

Kalpana also reported seeing amd-pstate-ut error out with -EBUSY for
"amd_pstate_ut_epp" test when starting from the passive mode and
amd_dynamic_epp=enable in the command line. The reason for the failure
is that the command line enables dynamic_epp by default after the mode
switch and the modifications to EPP values are blocked when running in
dynamic EPP mode.

Solution to both problems is to toggle off dynamic_epp *after* the mode
switch when the driver grabs the policy reference again since the unit
test is in full control of the policy after that point.

The final restoration step will reset the dynamic_epp state via mode
switch based on the initial conditions of the system.

Reported-by: Kalpana Shetty <kalpana.shetty@amd.com>
Reported-by: Dan Carpenter <error27@gmail.com>
Closes: https://lore.kernel.org/linux-pm/ahEq0CvdBX0T7_cO@stanley.mountain/
Fixes: f9f16835d4 ("cpufreq/amd-pstate-ut: Drop policy reference before driver switch")
Signed-off-by: K Prateek Nayak <kprateek.nayak@amd.com>
Link: https://patch.msgid.link/20260523055503.7651-1-kprateek.nayak@amd.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
 		2026-05-26 12:39:28 +02:00
..
Kconfig cpufreq: clean up dead code in Kconfig 2026-04-01 15:58:01 +02:00
Kconfig.arm cpufreq: tegra194: remove COMPILE_TEST 2026-03-20 11:03:33 +05:30
Kconfig.powerpc cpufreq: ppc_cbe: Remove powerpc Cell driver 2025-02-26 21:15:09 +05:30
Kconfig.x86 cpufreq/amd-pstate: Drop Kconfig option for dynamic EPP 2026-05-14 08:47:48 -05:00
Makefile cpufreq: omap: remove driver 2026-01-08 21:26:34 +01:00
acpi-cpufreq.c cpufreq: acpi-cpufreq: use DMI max speed when CPPC is unavailable 2026-03-25 14:29:05 +01:00
airoha-cpufreq.c cpufreq: airoha: Convert to of_machine_get_match() 2026-03-13 17:00:04 -05:00
amd-pstate-trace.c
…
amd-pstate-trace.h amd-pstate: Introduce a tracepoint trace_amd_pstate_cppc_req2() 2026-04-02 11:28:31 -05:00
amd-pstate-ut.c cpufreq/amd-pstate-ut: Disable dynamic_epp after the mode switch 2026-05-26 12:39:28 +02:00
amd-pstate.c cpufreq/amd-pstate: Drop Kconfig option for dynamic EPP 2026-05-14 08:47:48 -05:00
amd-pstate.h cpufreq/amd-pstate-ut: Add a unit test for raw EPP 2026-04-02 11:30:19 -05:00
amd_freq_sensitivity.c x86/msr: Rename 'rdmsrl_safe()' to 'rdmsrq_safe()' 2025-04-10 11:58:38 +02:00
apple-soc-cpufreq.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
armada-8k-cpufreq.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
armada-37xx-cpufreq.c Convert more 'alloc_obj' cases to default GFP_KERNEL arguments 2026-02-21 20:03:00 -08:00
bmips-cpufreq.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
brcmstb-avs-cpufreq.c cpufreq: brcmstb-avs: Use scope-based cleanup helper 2025-08-29 11:28:27 +05:30
cppc_cpufreq.c Power management updates for 7.1-rc1 2026-04-13 19:47:52 -07:00
cpufreq-dt-platdev.c cpufreq: Add QCS8300 to cpufreq-dt-platdev blocklist 2026-03-17 14:21:32 +05:30
cpufreq-dt.c cpufreq: Make drivers using CPUFREQ_ETERNAL specify transition latency 2025-10-01 13:56:24 +02:00
cpufreq-dt.h cpufreq: dt: Add register helper 2025-07-09 13:41:33 +05:30
cpufreq-nforce2.c cpufreq: nforce2: fix reference count leak in nforce2 2025-10-28 10:28:13 +05:30
cpufreq.c tracing updates for v7.1: 2026-04-17 09:43:12 -07:00
cpufreq_conservative.c cpufreq: conservative: Reset requested_freq on limits change 2026-03-23 13:32:57 +01:00
cpufreq_governor.c cpufreq: governor: fix double free in cpufreq_dbs_governor_init() error path 2026-04-01 16:08:15 +02:00
cpufreq_governor.h Merge back earlier cpufreq material for 7.1 2026-03-27 11:57:31 +01:00
cpufreq_governor_attr_set.c
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cpufreq_ondemand.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
cpufreq_ondemand.h cpufreq: ondemand: Update the efficient idle check for Intel extended Families 2025-09-10 12:25:08 +02:00
cpufreq_performance.c
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cpufreq_powersave.c
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cpufreq_stats.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
cpufreq_userspace.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
davinci-cpufreq.c cpufreq: davinci: Stop setting cpufreq_driver->attr field 2025-02-07 09:45:12 +05:30
e_powersaver.c Convert 'alloc_flex' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
elanfreq.c x86/msr: Add explicit includes of <asm/msr.h> 2025-05-02 10:23:47 +02:00
freq_table.c cpufreq: Don't skip cpufreq_frequency_table_cpuinfo() 2026-03-23 13:32:57 +01:00
gx-suspmod.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
highbank-cpufreq.c
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imx-cpufreq-dt.c
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imx6q-cpufreq.c cpufreq: Make drivers using CPUFREQ_ETERNAL specify transition latency 2025-10-01 13:56:24 +02:00
intel_pstate.c cpufreq: intel_pstate: Use HYBRID_SCALING_FACTOR_ADL for Bartlett Lake 2026-05-13 21:44:44 +02:00
kirkwood-cpufreq.c cpufreq: kirkwood: Stop setting cpufreq_driver->attr field 2025-02-07 09:45:12 +05:30
longhaul.c Convert more 'alloc_obj' cases to default GFP_KERNEL arguments 2026-02-21 20:03:00 -08:00
longhaul.h
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longrun.c
…
loongson2_cpufreq.c cpufreq: loongson: Stop setting cpufreq_driver->attr field 2025-02-07 09:45:12 +05:30
loongson3_cpufreq.c cpufreq: loongson: Set .set_boost directly 2025-02-07 09:45:15 +05:30
mediatek-cpufreq-hw.c cpufreq: Make drivers using CPUFREQ_ETERNAL specify transition latency 2025-10-01 13:56:24 +02:00
mediatek-cpufreq.c cpufreq: mediatek: Simplify with of_machine_get_match_data() 2025-11-26 19:42:21 -06:00
mvebu-cpufreq.c cpufreq: Init cpufreq only for present CPUs 2025-03-17 11:29:18 +05:30
p4-clockmod.c cpufreq: p4: Stop setting cpufreq_driver->attr field 2025-02-07 09:45:12 +05:30
pasemi-cpufreq.c cpufreq: pasemi: Stop setting cpufreq_driver->attr field 2025-02-07 09:45:12 +05:30
pcc-cpufreq.c
…
pmac32-cpufreq.c cpufreq: pmac: Stop setting cpufreq_driver->attr field 2025-02-07 09:45:13 +05:30
pmac64-cpufreq.c cpufreq: pmac: Stop setting cpufreq_driver->attr field 2025-02-07 09:45:13 +05:30
powernow-k6.c cpufreq: powernow: Stop setting cpufreq_driver->attr field 2025-02-07 09:45:13 +05:30
powernow-k7.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
powernow-k7.h
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powernow-k8.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
powernow-k8.h
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powernv-cpufreq.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
powernv-trace.h PM: cpufreq: powernv/tracing: Move powernv_throttle trace event 2025-07-21 16:40:56 -04:00
pxa2xx-cpufreq.c
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pxa3xx-cpufreq.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
qcom-cpufreq-hw.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
qcom-cpufreq-nvmem.c cpufreq: qcom-nvmem: Convert to of_machine_get_match() 2026-03-13 17:00:04 -05:00
qoriq-cpufreq.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
raspberrypi-cpufreq.c
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rcpufreq_dt.rs rust: cpufreq: replace `kernel::c_str!` with C-Strings 2026-01-27 11:21:22 +05:30
s3c64xx-cpufreq.c cpufreq: s3c64xx: Fix compilation warning 2025-01-23 20:47:32 +01:00
s5pv210-cpufreq.c cpufreq: s5pv210: Simplify with scoped for each OF child loop 2026-02-03 20:58:13 -06:00
sa1110-cpufreq.c
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sc520_freq.c x86/msr: Add explicit includes of <asm/msr.h> 2025-05-02 10:23:47 +02:00
scmi-cpufreq.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
scpi-cpufreq.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
sh-cpufreq.c cpufreq: Drop redundant freq_table parameter 2025-09-05 20:16:55 +02:00
sparc-us2e-cpufreq.c Convert more 'alloc_obj' cases to default GFP_KERNEL arguments 2026-02-21 20:03:00 -08:00
sparc-us3-cpufreq.c Convert more 'alloc_obj' cases to default GFP_KERNEL arguments 2026-02-21 20:03:00 -08:00
spear-cpufreq.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
speedstep-centrino.c cpufreq: speedstep: Stop setting cpufreq_driver->attr field 2025-02-07 09:45:14 +05:30
speedstep-ich.c cpufreq: speedstep: Stop setting cpufreq_driver->attr field 2025-02-07 09:45:14 +05:30
speedstep-lib.c cpufreq: speedstep-lib: Use int type to store negative error codes 2025-09-05 20:28:46 +02:00
speedstep-lib.h cpufreq: speedstep-lib: Use int type to store negative error codes 2025-09-05 20:28:46 +02:00
speedstep-smi.c cpufreq: speedstep: Stop setting cpufreq_driver->attr field 2025-02-07 09:45:14 +05:30
sti-cpufreq.c
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sun50i-cpufreq-nvmem.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
tegra20-cpufreq.c
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tegra124-cpufreq.c drivers: cpufreq: add Tegra114 support 2025-07-15 08:37:35 +05:30
tegra186-cpufreq.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
tegra194-cpufreq.c cpufreq: tegra194: Rename Tegra239 to Tegra238 2026-03-03 09:46:04 +05:30
ti-cpufreq.c cpufreq: ti-cpufreq: Convert to of_machine_get_match() 2026-03-13 17:00:04 -05:00
vexpress-spc-cpufreq.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
virtual-cpufreq.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00