3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Lv Zheng <lv.zh...@intel.com>


[ Upstream commit 861ba6351c520328e94a78c923b415faa9116287 ]

ACPICA commit 99bc3beca92c6574ea1d69de42e54f872e6373ce

It is reported that on Linux, RTC driver complains wrong errors on
hardware reduced platform:
  [    4.085420] ACPI Warning: Could not enable fixed event - real_time_clock 
(4) (20160422/evxface-654)

This patch fixes this by correctly adding runtime reduced hardware check.
Reported by Chandan Tagore, fixed by Lv Zheng.

Link: https://github.com/acpica/acpica/commit/99bc3bec
Tested-by: Chandan Tagore <tagore.chan...@gmail.com>
Signed-off-by: Lv Zheng <lv.zh...@intel.com>
Signed-off-by: Bob Moore <robert.mo...@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wyso...@intel.com>
Signed-off-by: Sasha Levin <alexander.le...@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 drivers/acpi/acpica/evxfevnt.c |   18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

--- a/drivers/acpi/acpica/evxfevnt.c
+++ b/drivers/acpi/acpica/evxfevnt.c
@@ -180,6 +180,12 @@ acpi_status acpi_enable_event(u32 event,
 
        ACPI_FUNCTION_TRACE(acpi_enable_event);
 
+       /* If Hardware Reduced flag is set, there are no fixed events */
+
+       if (acpi_gbl_reduced_hardware) {
+               return_ACPI_STATUS(AE_OK);
+       }
+
        /* Decode the Fixed Event */
 
        if (event > ACPI_EVENT_MAX) {
@@ -237,6 +243,12 @@ acpi_status acpi_disable_event(u32 event
 
        ACPI_FUNCTION_TRACE(acpi_disable_event);
 
+       /* If Hardware Reduced flag is set, there are no fixed events */
+
+       if (acpi_gbl_reduced_hardware) {
+               return_ACPI_STATUS(AE_OK);
+       }
+
        /* Decode the Fixed Event */
 
        if (event > ACPI_EVENT_MAX) {
@@ -290,6 +302,12 @@ acpi_status acpi_clear_event(u32 event)
 
        ACPI_FUNCTION_TRACE(acpi_clear_event);
 
+       /* If Hardware Reduced flag is set, there are no fixed events */
+
+       if (acpi_gbl_reduced_hardware) {
+               return_ACPI_STATUS(AE_OK);
+       }
+
        /* Decode the Fixed Event */
 
        if (event > ACPI_EVENT_MAX) {


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