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From: Daniil Tatianin <d-tatianin@yandex-team.ru>
To: Robert Moore <robert.moore@intel.com>
Cc: Daniil Tatianin <d-tatianin@yandex-team.ru>,
"Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
Len Brown <lenb@kernel.org>,
Sudeep Holla <sudeep.holla@arm.com>,
linux-acpi@vger.kernel.org,
acpica-devel@lists.linux.dev,
linux-kernel@vger.kernel.org
Subject: [PATCH] ACPICA: exserial: don't forget to handle FFixedHW opregions
for reading
Date: Tue, 1 Apr 2025 21:43:11 +0300
Message-Id: <20250401184312.599962-1-d-tatianin@yandex-team.ru>
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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 d=
ata")
Signed-off-by: Daniil Tatianin <d-tatianin@yandex-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 =3D ACPI_READ;
break;
=20
+ case ACPI_ADR_SPACE_FIXED_HARDWARE:
+
+ buffer_length =3D ACPI_FFH_INPUT_BUFFER_SIZE;
+ function =3D ACPI_READ;
+ break;
+
default:
return_ACPI_STATUS(AE_AML_INVALID_SPACE_ID);
}
--=20
2.34.1