Commit fbf04215d996 for kernel

commit fbf04215d9966da61feee3f4ec24dbf4544cfd0f
Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Date:   Thu Nov 27 20:52:55 2025 +0100

    Revert "ACPI: processor: Update cpuidle driver check in __acpi_processor_start()"

    Revert commit 8a1b5d412cb4 ("ACPI: processor: Update cpuidle driver
    check in __acpi_processor_start()") which depends on commit
    7a8c994cbb2d ("ACPI: processor: idle: Optimize ACPI idle driver
    registration") that got reverted.

    Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c
index 7644de24d2fa..65e779be64ff 100644
--- a/drivers/acpi/processor_driver.c
+++ b/drivers/acpi/processor_driver.c
@@ -166,7 +166,7 @@ static int __acpi_processor_start(struct acpi_device *device)
 	if (result && !IS_ENABLED(CONFIG_ACPI_CPU_FREQ_PSS))
 		dev_dbg(&device->dev, "CPPC data invalid or not present\n");

-	if (cpuidle_get_driver() == &acpi_idle_driver)
+	if (!cpuidle_get_driver() || cpuidle_get_driver() == &acpi_idle_driver)
 		acpi_processor_power_init(pr);

 	acpi_pss_perf_init(pr);