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@yandex-team.ru>
Link: https://patch.msgid.link/20250401184312.599962-1-d-tatianin@yandex-team.ru
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/acpi/acpica/exserial.c b/drivers/acpi/acpica/exserial.c
index 5241f4c01c765585ac3a47642602fc3d9ae68ede..89a4ac447a2bea45fa1eec230b0bce7a2a50a002 100644 (file)
--- 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);
        }