linux-kernel - [PATCH v1 1/2] ACPI: PM: Let acpi_dev_pm_attach() skip devices without ACPI PM

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <5050298.GXAFRqVoOG@rafael.j.wysocki>
Date: Sat, 10 Jan 2026 12:57:00 +0100
From: "Rafael J. Wysocki" <rafael@...nel.org>
To: Linux ACPI <linux-acpi@...r.kernel.org>
Cc: LKML <linux-kernel@...r.kernel.org>, Linux PM <linux-pm@...r.kernel.org>,
 Todd Brandt <todd.e.brandt@...ux.intel.com>,
 Xi Pardee <xi.pardee@...ux.intel.com>
Subject:
 [PATCH v1 1/2] ACPI: PM: Let acpi_dev_pm_attach() skip devices without ACPI
 PM

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

It is pointless to attach the generic ACPI PM domain to devices whose
ACPI companions don't support ACPI power management and don't have a
wakeup GPE, so update acpi_dev_pm_attach() to skip such devices.

No intentional functional impact.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
 drivers/acpi/device_pm.c |    9 +++++++++
 1 file changed, 9 insertions(+)

--- a/drivers/acpi/device_pm.c
+++ b/drivers/acpi/device_pm.c
@@ -1457,6 +1457,15 @@ int acpi_dev_pm_attach(struct device *de
 		return 0;

 	/*
+	 * Skip devices whose ACPI companions don't support power management and
+	 * don't have a wakeup GPE.
+	 */
+	if (!acpi_device_power_manageable(adev) && !acpi_device_can_wakeup(adev)) {
+		dev_dbg(dev, "No ACPI power management or wakeup GPE\n");
+		return 0;
+	}
+
+	/*
 	 * Only attach the power domain to the first device if the
 	 * companion is shared by multiple. This is to prevent doing power
 	 * management twice.