linux-kernel - [PATCH] ACPICA: exserial: don't forget to handle FFixedHW opregions for reading

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Message-Id: <20250401184312.599962-1-d-tatianin@yandex-team.ru>
Date: Tue,  1 Apr 2025 21:43:11 +0300
From: Daniil Tatianin <d-tatianin@...dex-team.ru>
To: Robert Moore <robert.moore@...el.com>
Cc: Daniil Tatianin <d-tatianin@...dex-team.ru>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Len Brown <lenb@...nel.org>,
	Sudeep Holla <sudeep.holla@....com>,
	linux-acpi@...r.kernel.org,
	acpica-devel@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: [PATCH] ACPICA: exserial: don't forget to handle FFixedHW opregions for reading

The initial commit that introduced support for FFixedHW operation
regions did add a special case in the AcpiExReadSerialBus If, but
forgot to actually handle it inside the switch, so add the missing case
to prevent reads from failing with AE_AML_INVALID_SPACE_ID.

Link: https://github.com/acpica/acpica/pull/998
Fixes: ee64b827a9a ("ACPICA: Add support for FFH Opregion special context data")
Signed-off-by: Daniil Tatianin <d-tatianin@...dex-team.ru>
---
 drivers/acpi/acpica/exserial.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/acpi/acpica/exserial.c b/drivers/acpi/acpica/exserial.c
index 5241f4c01c76..89a4ac447a2b 100644
--- a/drivers/acpi/acpica/exserial.c
+++ b/drivers/acpi/acpica/exserial.c
@@ -201,6 +201,12 @@ acpi_ex_read_serial_bus(union acpi_operand_object *obj_desc,
 		function = ACPI_READ;
 		break;
 
+	case ACPI_ADR_SPACE_FIXED_HARDWARE:
+
+		buffer_length = ACPI_FFH_INPUT_BUFFER_SIZE;
+		function = ACPI_READ;
+		break;
+
 	default:
 		return_ACPI_STATUS(AE_AML_INVALID_SPACE_ID);
 	}
-- 
2.34.1