[PATCH v2 0/3] ACPI: a missing FACS table can be ignored under some circumstances

[Fu Wei]

ACPI: 
(1)Improve the return values and the log info in the 
fwts_acpi_handle_fadt_tables function.
(2)Add a hardware reduced mode check function in 
src/lib/src/fwts_acpi_tables.c.
(3)A missing FACS table can be ignored under some circumstances: 
   a.Both of the FADT fields FIRMWARE_CTRL and X_FIRMWARE_CTRL are
allowed to be null, if and only if ACPI is operating in hardware-
reduced mode.
   b.If the ACPI tables are from before ACPI 5.0, or if ACPI is 
not operating in hardware-reduced mode, at least one of the
FIRMWARE_CTRL or X_FIRMWARE_CTRL fields _must_ be non-null.

This patch corrects the logic to ensure that a missing FACS is only
allowed under the proper circumstances.

 src/acpi/acpitables/acpitables.c   |  5 ++--
 src/lib/include/fwts_acpi.h        |  1 +
 src/lib/include/fwts_acpi_tables.h |  2 ++
 src/lib/src/fwts_acpi_tables.c     | 48 +++++++++++++++++++++++++++++---------
 4 files changed, 43 insertions(+), 13 deletions(-)


Signed-off-by: Fu Wei <fu.wei at linaro.org>
Acked-by: Hanjun Guo <hanjun.guo at linaro.org>
Reviewed-by: Al Stone <al.stone at linaro.org>
-- 
1.8.3.1