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ACPICA: executer/exsystem: Inform users about ACPI spec violation

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ACPICA commit 05ba545ce7859392250b18c10081db25c90ed8d7

Values greater than 100 microseconds violate the ACPI specification, so
warn users about it.

From ACPI Specification version 6.2 Errata A, 19.6.128 *Stall (Stall for
a Short Time)*:

> The implementation of Stall is OS-specific, but must not relinquish
> control of the processor. Because of this, delays longer than 100
> microseconds must use Sleep instead of Stall.

Link: https://github.com/acpica/acpica/commit/05ba545c
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reported-by: kernel test robot <lkp@intel.com>
This commit is contained in:
Paul Menzel 2022-04-11 20:59:00 +02:00 committed by Rafael J. Wysocki
parent 1c5d62f5dd
commit ace8f1c54a
1 changed files with 5 additions and 0 deletions
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5
drivers/acpi/acpica/exsystem.c
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@ -137,6 +137,11 @@ acpi_status acpi_ex_system_do_stall(u32 how_long_us)
"Time parameter is too large (%u)", how_long_us));
status = AE_AML_OPERAND_VALUE;
} else {
if (how_long_US > 100) {
ACPI_WARNING((AE_INFO,
"Time parameter %u us > 100 us violating ACPI spec, please fix the firmware.",
how_long_us));
}
acpi_os_stall(how_long_us);
}