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linux/drivers/cpufreq
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Srinivas Pandruvada 6b050482ec cpufreq: intel_pstate: Fix crash during turbo disable 
When the system is booted with kernel command line argument "nosmt" or
"maxcpus" to limit the number of CPUs, disabling turbo via:

 echo 1 > /sys/devices/system/cpu/intel_pstate/no_turbo

results in a crash:

 PF: supervisor read access in kernel mode
 PF: error_code(0x0000) - not-present page
 PGD 0 P4D 0
 Oops: Oops: 0000 [#1] SMP PTI
 ...
 RIP: 0010:store_no_turbo+0x100/0x1f0
 ...

This occurs because for_each_possible_cpu() returns CPUs even if they
are not online. For those CPUs, all_cpu_data[] will be NULL. Since
commit 973207ae3d ("cpufreq: intel_pstate: Rearrange max frequency
updates handling code"), all_cpu_data[] is dereferenced even for CPUs
which are not online, causing the NULL pointer dereference.

To fix that, pass CPU number to intel_pstate_update_max_freq() and use
all_cpu_data[] for those CPUs for which there is a valid cpufreq policy.

Fixes: 973207ae3d ("cpufreq: intel_pstate: Rearrange max frequency updates handling code")
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=221068
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Cc: 6.16+ <stable@vger.kernel.org> # 6.16+
Link: https://patch.msgid.link/20260225001752.890164-1-srinivas.pandruvada@linux.intel.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2026-02-25 14:39:19 +01:00
..
acpi-cpufreq.c Convert more 'alloc_obj' cases to default GFP_KERNEL arguments 2026-02-21 20:03:00 -08:00
airoha-cpufreq.c cpufreq: airoha: Add support for AN7583 SoC 2025-08-11 12:19:20 +05:30
amd-pstate-trace.c cpufreq: amd-pstate: Add trace for AMD P-State module 2021-12-30 18:51:39 +01:00
amd-pstate-trace.h cpufreq/amd-pstate: Move all EPP tracing into *_update_perf and *_set_epp functions 2025-03-06 13:01:25 -06:00
amd-pstate-ut.c Power management updates for 6.16-rc1 2025-05-27 16:48:47 -07:00
amd-pstate.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
amd-pstate.h amd-pstate-ut: Reset amd-pstate driver mode after running selftests 2025-05-05 12:07:42 -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 Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
cpufreq-dt-platdev.c CPUFreq arm updates for 7.0 2026-01-27 14:46:28 +01:00
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 Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
cpufreq_conservative.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
cpufreq_governor.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
cpufreq_governor.h cpufreq: governor: Use kobject release() method to free dbs_data 2022-04-13 15:22:41 +02:00
cpufreq_governor_attr_set.c cpufreq: Move to_gov_attr_set() to cpufreq.h 2022-02-04 19:22:34 +01:00
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 cpufreq: Introduce CPUFREQ_GOV_STRICT_TARGET 2020-11-10 18:31:17 +01:00
cpufreq_powersave.c cpufreq: Introduce CPUFREQ_GOV_STRICT_TARGET 2020-11-10 18:31:17 +01:00
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: Replace pointer subtraction with iteration macro 2025-09-23 17:16:56 +02:00
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 cpufreq: Add __init annotation to module init funcs 2022-09-26 11:15:04 +05:30
imx-cpufreq-dt.c cpufreq: Switch back to struct platform_driver::remove() 2024-10-28 12:24:39 +01:00
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: Fix crash during turbo disable 2026-02-25 14:39:19 +01:00
Kconfig cpufreq: Add Rust-based cpufreq-dt driver 2025-05-20 11:21:11 +05:30
Kconfig.arm cpufreq: omap: remove driver 2026-01-08 21:26:34 +01:00
Kconfig.powerpc cpufreq: ppc_cbe: Remove powerpc Cell driver 2025-02-26 21:15:09 +05:30
Kconfig.x86 cpufreq: Introduce an optional cpuinfo_avg_freq sysfs entry 2025-02-17 18:09:31 +00:00
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
longrun.c cpufreq: Convert to new X86 CPU match macros 2020-03-24 21:31:27 +01:00
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
Makefile cpufreq: omap: remove driver 2026-01-08 21:26:34 +01:00
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 cpufreq: Switch back to struct platform_driver::remove() 2024-10-28 12:24:39 +01:00
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
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
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 cpufreq: pxa3: move clk register access to clk driver 2022-05-07 22:55:49 +02:00
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: add sentinel to qcom_cpufreq_ipq806x_match_list 2026-01-27 11:21:22 +05:30
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 cpufreq: Switch back to struct platform_driver::remove() 2024-10-28 12:24:39 +01:00
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 ARM: sa1100: remove unused board files 2023-01-12 10:53:12 +01:00
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 cpufreq: Use of_property_present() 2024-08-07 12:11:45 +05:30
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 Devicetree updates for v6.4, part 2: 2023-04-27 10:09:05 -07:00
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 Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
ti-cpufreq.c cpufreq: ti-cpufreq: add support for AM62L3 SoC 2026-01-27 11:21:23 +05:30
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