[PATCH v4 4/5] ACPI: in HW reduced mode, using FADT PM information is not allowed.
From: al.stone at linaro.org <hidden>
Date: 2013-12-17 00:16:40
Also in:
linux-acpi
Subsystem:
acpi, the rest · Maintainers:
"Rafael J. Wysocki", Linus Torvalds
From: Al Stone <redacted> Per the ACPI 5.0 specification, section 5.2.9, none of the power management fields in the FADT are to be used. Short-circuit using any of those fields in acpi_processor_get_power_info_fadt(). Signed-off-by: Al Stone <redacted> --- drivers/acpi/processor_idle.c | 8 ++++++++ 1 file changed, 8 insertions(+)
diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index b91dcaa..4917a9e 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c@@ -270,6 +270,14 @@ static int acpi_processor_get_power_info_fadt(struct acpi_processor *pr) if (!pr->pblk) return -ENODEV; + /* + * Using power management information from the FADT is not + * allowed when in HW reduced mode. See ACPI 5.0, section + * 5.2.9. + */ + if (acpi_gbl_reduced_hardware) + return -ENODEV; + /* if info is obtained from pblk/fadt, type equals state */ pr->power.states[ACPI_STATE_C2].type = ACPI_STATE_C2; pr->power.states[ACPI_STATE_C3].type = ACPI_STATE_C3;
--
1.8.3.1