[PATCH 1/1] ACPI: tables: FPDT: Do not print FW_BUG message if subtable types are reserved

[Adrian Huang <adrianhuang0701@gmail.com>]

From: Adrian Huang <ahuang12@lenovo.com>

Table 5.90 "Runtime Performance Record Types" in ACPI 6.4 spec [1] says:

  These type values "0x0003-0xFFFF" of Runtime Performance Record Types
  are reserved for ACPI spec usage, platform vendor usage, hardware
  vendor usage, platform firmware vendor usage and future use.

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 subtable
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#firmware-performance-data-table-fpdt

Cc: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Adrian Huang <ahuang12@lenovo.com>
---
 drivers/acpi/acpi_fpdt.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/acpi/acpi_fpdt.c b/drivers/acpi/acpi_fpdt.c
index 4ee2ad234e3d..568f26a7490a 100644
--- a/drivers/acpi/acpi_fpdt.c
+++ b/drivers/acpi/acpi_fpdt.c
@@ -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;
-- 
2.25.1