From c0e0421a60bf468e88cf569fbd727346b138ed04 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Fri, 17 Mar 2023 17:52:33 +0100 Subject: [PATCH] ACPI: processor: Reorder acpi_processor_driver_init() The cpufreq policy notifier in the ACPI processor driver may as well be registered before the driver itself, which causes acpi_processor_cpufreq_init to be true (unless the notifier registration fails, which is unlikely at that point) when the ACPI CPU thermal cooling devices are registered, so the processor_get_max_state() result does not change while acpi_processor_driver_init() is running. Change the ordering in acpi_processor_driver_init() accordingly to prevent the max_state value from remaining 0 permanently for all ACPI CPU cooling devices due to setting acpi_processor_cpufreq_init too late. [Note that processor_get_max_state() may still return different values at different times after this change, depending on the cpufreq driver registration time, but that issue needs to be addressed separately.] Fixes: a365105c685c("thermal: sysfs: Reuse cdev->max_state") Reported-by: Wang, Quanxian Link: https://lore.kernel.org/linux-pm/53ec1f06f61c984100868926f282647e57ecfb2d.camel@intel.com Signed-off-by: Rafael J. Wysocki Tested-by: Zhang Rui Reviewed-by: Zhang Rui --- drivers/acpi/processor_driver.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c index 1278969eec1f..4bd16b3f0781 100644 --- a/drivers/acpi/processor_driver.c +++ b/drivers/acpi/processor_driver.c @@ -263,6 +263,12 @@ static int __init acpi_processor_driver_init(void) if (acpi_disabled) return 0; + if (!cpufreq_register_notifier(&acpi_processor_notifier_block, + CPUFREQ_POLICY_NOTIFIER)) { + acpi_processor_cpufreq_init = true; + acpi_processor_ignore_ppc_init(); + } + result = driver_register(&acpi_processor_driver); if (result < 0) return result; @@ -276,12 +282,6 @@ static int __init acpi_processor_driver_init(void) cpuhp_setup_state_nocalls(CPUHP_ACPI_CPUDRV_DEAD, "acpi/cpu-drv:dead", NULL, acpi_soft_cpu_dead); - if (!cpufreq_register_notifier(&acpi_processor_notifier_block, - CPUFREQ_POLICY_NOTIFIER)) { - acpi_processor_cpufreq_init = true; - acpi_processor_ignore_ppc_init(); - } - acpi_processor_throttling_init(); return 0; err: -- 2.11.0