diff options
| author | Bob Moore <robert.moore@intel.com> | 2011-11-16 10:57:28 +0800 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2012-01-17 03:36:28 -0500 |
| commit | 22e5b40ab21fcac21db0ff25fbb844ffecc73a4a (patch) | |
| tree | 6fe339a8c410d2f8f2a0f844c976046d3be47e17 /drivers/acpi/acpica/evglock.c | |
| parent | 2355e10f07b2c550c671f98b68aedf323c299aeb (diff) | |
| download | linux-22e5b40ab21fcac21db0ff25fbb844ffecc73a4a.tar.bz2 | |
ACPI 5.0: Implement hardware-reduced option
If HW-reduced flag is set in the FADT, do not attempt to access
or initialize any ACPI hardware, including SCI and global lock.
No FACS will be present.
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/acpi/acpica/evglock.c')
| -rw-r--r-- | drivers/acpi/acpica/evglock.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/evglock.c b/drivers/acpi/acpica/evglock.c index 56a562a1e5d7..af1e71af1b64 100644 --- a/drivers/acpi/acpica/evglock.c +++ b/drivers/acpi/acpica/evglock.c @@ -70,6 +70,12 @@ acpi_status acpi_ev_init_global_lock_handler(void) ACPI_FUNCTION_TRACE(ev_init_global_lock_handler); + /* If Hardware Reduced flag is set, there is no global lock */ + + if (acpi_gbl_reduced_hardware) { + return_ACPI_STATUS(AE_OK); + } + /* Attempt installation of the global lock handler */ status = acpi_install_fixed_event_handler(ACPI_EVENT_GLOBAL, |