ACPI: Add _OST support for ACPI CPU hotplug

Changed acpi_processor_hotplug_notify() to call ACPI _OST method
when ACPI CPU hotplug operation has completed.

Signed-off-by: Toshi Kani <toshi.kani@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 20 insertions, 8 deletions

diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c
index 0734086537b8..971c45474703 100644
--- a/drivers/acpi/processor_driver.c
+++ b/drivers/acpi/processor_driver.c
@@ -701,9 +701,9 @@ static void acpi_processor_hotplug_notify(acpi_handle handle,
 {
         struct acpi_processor *pr;
         struct acpi_device *device = NULL;
+        u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */
         int result;
 
-
         switch (event) {
         case ACPI_NOTIFY_BUS_CHECK:
         case ACPI_NOTIFY_DEVICE_CHECK:
@@ -715,14 +715,18 @@ static void acpi_processor_hotplug_notify(acpi_handle handle,
                 if (!is_processor_present(handle))
                         break;
 
-                if (acpi_bus_get_device(handle, &device)) {
-                        result = acpi_processor_device_add(handle, &device);
-                        if (result)
-                                printk(KERN_ERR PREFIX
-                                            "Unable to add the device\n");
+                if (!acpi_bus_get_device(handle, &device))
+                        break;
+
+                result = acpi_processor_device_add(handle, &device);
+                if (result) {
+                        printk(KERN_ERR PREFIX "Unable to add the device\n");
                         break;
                 }
+
+                ost_code = ACPI_OST_SC_SUCCESS;
                 break;
+
         case ACPI_NOTIFY_EJECT_REQUEST:
                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                                   "received ACPI_NOTIFY_EJECT_REQUEST\n"));
@@ -736,15 +740,23 @@ static void acpi_processor_hotplug_notify(acpi_handle handle,
                 if (!pr) {
                         printk(KERN_ERR PREFIX
                                     "Driver data is NULL, dropping EJECT\n");
-                        return;
+                        break;
                 }
+
+                /* REVISIT: update when eject is supported */
+                ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
                 break;
+
         default:
                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                                   "Unsupported event [0x%x]\n", event));
-                break;
+
+                /* non-hotplug event; possibly handled by other handler */
+                return;
         }
 
+        /* Inform firmware that the hotplug operation has completed */
+        (void) acpi_evaluate_hotplug_ost(handle, event, ost_code, NULL);
         return;
 }