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ACPICA: Do not use extended sleep registers unless HW-reduced bit is set 

Previous implementation incorrectly used the ACPI 5.0 extended
sleep registers if they were simply populated. This caused
problems on some non-HW-reduced machines. As per the ACPI spec,
they should only be used if the HW-reduced bit is set.  Lv Zheng,
ACPICA BZ 1020.

References: https://bugzilla.kernel.org/show_bug.cgi?id=54181
References: https://bugs.acpica.org/show_bug.cgi?id=1020
Reported-by: Daniel Rowe <bart@fathom13.com>
Bisected-by: Brint E. Kriebel <kernel@bekit.net>
Cc: 3.4+ <stable@vger.kernel.org>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Lv Zheng 2013-06-08 00:59:18 +00:00 committed by Rafael J. Wysocki
parent 42f47869c6
commit 7cec7048fe
1 changed files with 5 additions and 3 deletions
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8
drivers/acpi/acpica/hwxfsleep.c
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@ -240,12 +240,14 @@ static acpi_status acpi_hw_sleep_dispatch(u8 sleep_state, u32 function_id)
&acpi_sleep_dispatch[function_id];
#if (!ACPI_REDUCED_HARDWARE)
/*
* If the Hardware Reduced flag is set (from the FADT), we must
* use the extended sleep registers
* use the extended sleep registers (FADT). Note: As per the ACPI
* specification, these extended registers are to be used for HW-reduced
* platforms only. They are not general-purpose replacements for the
* legacy PM register sleep support.
*/
if (acpi_gbl_reduced_hardware || acpi_gbl_FADT.sleep_control.address) {
if (acpi_gbl_reduced_hardware) {
status = sleep_functions->extended_function(sleep_state);
} else {
/* Legacy sleep */