Commit 97e03410 authored Aug 19, 2021 by Adrian Huang Committed by Rafael J. Wysocki Aug 25, 2021

ACPI: tables: FPDT: Do not print FW_BUG message if record types are reserved

In ACPI 6.4 spec, record types "0x0002-0xffff" of FPDT Performance Record
Types [1] and record types "0x0003-0xffff" of Runtime Performance Record
Types [2] are reserved.

Users might be confused with the FW_BUG message, and they think this
is the FW issue. Here is the example in a Lenovo box:

  ACPI: FPDT 0x00000000A820A000 000044 (v01 LENOVO THINKSYS 00000100 01000013)
  ACPI: Reserving FPDT table memory at [mem 0xa820a000-0xa820a043]
  ACPI FPDT: [Firmware Bug]: Invalid record 4113 found

So, remove the FW_BUG message to avoid confusion since those types are
reserved in ACPI 6.4 spec.

[1] https://uefi.org/specs/ACPI/6.4/05_ACPI_Software_Programming_Model/ACPI_Software_Programming_Model.html#fpdt-performance-record-types-table
[2] https://uefi.org/specs/ACPI/6.4/05_ACPI_Software_Programming_Model/ACPI_Software_Programming_Model.html#runtime-performance-record-types-table



Signed-off-by: Adrian Huang <ahuang12@lenovo.com>
Acked-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

parent 2aaea6a1

drivers/acpi/acpi_fpdt.c

+3 −4

Original line number	Diff line number	Diff line
		@@ -220,8 +220,8 @@ static int fpdt_process_subtable(u64 address, u32 subtable_type)
		break;

		default:
		pr_err(FW_BUG "Invalid record %d found.\n", record_header->type);
		return -EINVAL;
		/* Other types are reserved in ACPI 6.4 spec. */
		break;
		}
		}
		return 0;
		@@ -254,8 +254,7 @@ static int __init acpi_init_fpdt(void)
		subtable->type);
		break;
		default:
		pr_info(FW_BUG "Invalid subtable type %d found.\n",
		subtable->type);
		/* Other types are reserved in ACPI 6.4 spec. */
		break;
		}
		offset += sizeof(*subtable);