The legacy bit width field in the Generic Address Structure is 1 byte,
limiting the reportable register width to 255 bits. Larger registers
will cause a length mismatch warning to be printed in
acpi_tb_validate_fadt().
To avoid the warning, disable the length mismatch check for registers
larger than 255 bits.
Signed-off-by: Linn Crosetto <linn@xxxxxx>
---
drivers/acpi/acpica/tbfadt.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/acpi/acpica/tbfadt.c b/drivers/acpi/acpica/tbfadt.c
index 74181bf..e87abcd 100644
--- a/drivers/acpi/acpica/tbfadt.c
+++ b/drivers/acpi/acpica/tbfadt.c
@@ -561,6 +561,7 @@ static void acpi_tb_validate_fadt(void)
* legacy length field and the corresponding 64-bit X length field.
*/
if (address64->address &&
+ ACPI_MUL_8(length) <= ACPI_UINT8_MAX &&
(address64->bit_width != ACPI_MUL_8(length))) {
ACPI_BIOS_WARNING((AE_INFO,
"32/64X length mismatch in FADT/%s: %u/%u",
--
1.7.11.3
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