linux-kernel - [PATCH v1 1/2] ACPI: processor: Update cpuidle driver check in __acpi_processor

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Message-ID: <5044465.31r3eYUQgx@rafael.j.wysocki>
Date: Thu, 18 Sep 2025 23:09:17 +0200
From: "Rafael J. Wysocki" <rafael@...nel.org>
To: Linux ACPI <linux-acpi@...r.kernel.org>
Cc: Huisong Li <lihuisong@...wei.com>, LKML <linux-kernel@...r.kernel.org>,
 Linux PM <linux-pm@...r.kernel.org>,
 Mario Limonciello <mario.limonciello@....com>,
 "Shenoy, Gautham Ranjal" <gautham.shenoy@....com>
Subject:
 [PATCH v1 1/2] ACPI: processor: Update cpuidle driver check in
 __acpi_processor_start()

From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

Commit 7a8c994cbb2d ("ACPI: processor: idle: Optimize ACPI idle
driver registration") moved the ACPI idle driver registration to
acpi_processor_driver_init() and acpi_processor_power_init() does
not register an idle driver any more, so the cpuidle driver check
in __acpi_processor_start() needs to be updated to avoid calling
acpi_processor_power_init() without a cpuidle driver (in which
case the registration of the cpuidle device in that function
would fail anyway).

Fixes: 7a8c994cbb2d ("ACPI: processor: idle: Optimize ACPI idle driver registration")
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---

Commit 7a8c994cbb2d is only in linux-next at this point.

---
 drivers/acpi/processor_driver.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

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

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

 	acpi_pss_perf_init(pr);