linux-kernel - [PATCH v1 4/4] ACPI: scan: Make acpi_processor

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Date: Wed, 21 Feb 2024 21:03:17 +0100
From: "Rafael J. Wysocki" <rjw@...ysocki.net>
To: Linux ACPI <linux-acpi@...r.kernel.org>,
 Jonathan Cameron <jonathan.cameron@...wei.com>
Cc: LKML <linux-kernel@...r.kernel.org>,
 Mika Westerberg <mika.westerberg@...ux.intel.com>,
 "Rafael J. Wysocki" <rafael@...nel.org>,
 "Russell King (Oracle)" <linux@...linux.org.uk>
Subject:
 [PATCH v1 4/4] ACPI: scan: Make acpi_processor_add() check the device enabled
 bit

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

Modify acpi_processor_add() return an error if _STA returns the enabled
bit clear for the given processor device, so as to avoid using processors
that don't decode their resources, as per the ACPI specification. [1]

Link: https://uefi.org/specs/ACPI/6.5/06_Device_Configuration.html#sta-device-status # [1]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
 drivers/acpi/acpi_processor.c |    3 +++
 1 file changed, 3 insertions(+)

Index: linux-pm/drivers/acpi/acpi_processor.c
===================================================================
--- linux-pm.orig/drivers/acpi/acpi_processor.c
+++ linux-pm/drivers/acpi/acpi_processor.c
@@ -381,6 +381,9 @@ static int acpi_processor_add(struct acp
 	struct device *dev;
 	int result = 0;

+	if (!acpi_device_is_enabled(device))
+		return -ENODEV;
+
 	pr = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
 	if (!pr)
 		return -ENOMEM;