linux-kernel - [PATCH v2 4/7] ACPI: processor: idle: Disable ACPI idle if get power information failed in power notify

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Message-ID: <20251103084244.2654432-5-lihuisong@huawei.com>
Date: Mon, 3 Nov 2025 16:42:41 +0800
From: Huisong Li <lihuisong@...wei.com>
To: <rafael@...nel.org>, <lenb@...nel.org>
CC: <linux-acpi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<Sudeep.Holla@....com>, <linuxarm@...wei.com>, <jonathan.cameron@...wei.com>,
	<zhanjie9@...ilicon.com>, <zhenglifeng1@...wei.com>, <yubowen8@...wei.com>,
	<lihuisong@...wei.com>
Subject: [PATCH v2 4/7] ACPI: processor: idle: Disable ACPI idle if get power information failed in power notify

The old states may not be usable any more if get power information
failed in power notify. The ACPI idle should be disabled entirely.

Fixes: f427e5f1cf75 ("ACPI / processor: Get power info before updating the C-states")
Signed-off-by: Huisong Li <lihuisong@...wei.com>
---
 drivers/acpi/processor_idle.c | 22 +++++++++++++++++-----
 1 file changed, 17 insertions(+), 5 deletions(-)

diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index c73df5933691..4627b00257e6 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -1317,6 +1317,7 @@ int acpi_processor_power_state_has_changed(struct acpi_processor *pr)
 	int cpu;
 	struct acpi_processor *_pr;
 	struct cpuidle_device *dev;
+	int ret = 0;
 
 	if (disabled_by_idle_boot_param())
 		return 0;
@@ -1345,8 +1346,18 @@ int acpi_processor_power_state_has_changed(struct acpi_processor *pr)
 			cpuidle_disable_device(dev);
 		}
 
-		/* Populate Updated C-state information */
-		acpi_processor_get_power_info(pr);
+		/*
+		 * Populate Updated C-state information
+		 * The same idle state is used for all CPUs, cpuidle of all CPUs
+		 * should be disabled.
+		 */
+		ret = acpi_processor_get_power_info(pr);
+		if (ret) {
+			pr_err("Get processor-%u power information failed, disable cpuidle of all CPUs\n",
+			       pr->id);
+			goto release_lock;
+		}
+
 		acpi_processor_setup_cpuidle_states(pr);
 
 		/* Enable all cpuidle devices */
@@ -1354,18 +1365,19 @@ int acpi_processor_power_state_has_changed(struct acpi_processor *pr)
 			_pr = per_cpu(processors, cpu);
 			if (!_pr || !_pr->flags.power_setup_done)
 				continue;
-			acpi_processor_get_power_info(_pr);
-			if (_pr->flags.power) {
+			ret = acpi_processor_get_power_info(_pr);
+			if (!ret && _pr->flags.power) {
 				dev = per_cpu(acpi_cpuidle_device, cpu);
 				acpi_processor_setup_cpuidle_dev(_pr, dev);
 				cpuidle_enable_device(dev);
 			}
 		}
+release_lock:
 		cpuidle_resume_and_unlock();
 		cpus_read_unlock();
 	}
 
-	return 0;
+	return ret;
 }
 
 void acpi_processor_register_idle_driver(void)
-- 
2.33.0