linux-kernel - [PATCH 1/3] ACPI: OSI: Stop advertising support for "3.0

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Message-Id: <20250410165456.4173-2-W_Armin@gmx.de>
Date: Thu, 10 Apr 2025 18:54:54 +0200
From: Armin Wolf <W_Armin@....de>
To: rafael@...nel.org,
	rui.zhang@...el.com
Cc: lenb@...nel.org,
	linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/3] ACPI: OSI: Stop advertising support for "3.0 _SCP Extensions"

As specified in section 5.7.2 of the ACPI specification the feature
group string "3.0 _SCP Extensions" implies that the operating system
evaluates the _SCP control method with additional parameters.

However the ACPI thermal driver evaluates the _SCP control method
without those additional parameters, conflicting with the above
feature group string advertised to the firmware thru _OSI.

Stop advertising support for this feature string to avoid confusing
the ACPI firmware.

Fixes: e5f660ebef68 ("ACPI / osi: Collect _OSI handling into one single file")
Signed-off-by: Armin Wolf <W_Armin@....de>
---
 drivers/acpi/osi.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/acpi/osi.c b/drivers/acpi/osi.c
index df9328c850bd..f2c943b934be 100644
--- a/drivers/acpi/osi.c
+++ b/drivers/acpi/osi.c
@@ -42,7 +42,6 @@ static struct acpi_osi_entry
 osi_setup_entries[OSI_STRING_ENTRIES_MAX] __initdata = {
 	{"Module Device", true},
 	{"Processor Device", true},
-	{"3.0 _SCP Extensions", true},
 	{"Processor Aggregator Device", true},
 };

--
2.39.5