ACPI: Add _OST support for ACPI container hotplug

Changed container_notify_cb() to call ACPI _OST method when ACPI
container hotplug operation has completed. Slightly restructured
the code with the same logic. The function sets eject_pending bit
for an eject request since it does not initiate hot-remove operation.
This bit is checked by the sysfs eject handler to determine if the
request is originated from an ACPI eject notification.

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

diff --git a/drivers/acpi/container.c b/drivers/acpi/container.c
index 45cd03b4630e00579d1b0840c5c1afb3657b9b94..1f9f7d7d7bc534f27ec9d0d31b2f5d61246c65b2 100644 (file)
--- a/drivers/acpi/container.c
+++ b/drivers/acpi/container.c
@@ -158,9 +158,7 @@ static void container_notify_cb(acpi_handle handle, u32 type, void *context)
        int result;
        int present;
        acpi_status status;
-
-
-       present = is_device_present(handle);
+       u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */
 
        switch (type) {
        case ACPI_NOTIFY_BUS_CHECK:
@@ -169,32 +167,47 @@ static void container_notify_cb(acpi_handle handle, u32 type, void *context)
                printk(KERN_WARNING "Container driver received %s event\n",
                       (type == ACPI_NOTIFY_BUS_CHECK) ?
                       "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
+
+               present = is_device_present(handle);
                status = acpi_bus_get_device(handle, &device);
-               if (present) {
-                       if (ACPI_FAILURE(status) || !device) {
-                               result = container_device_add(&device, handle);
-                               if (!result)
-                                       kobject_uevent(&device->dev.kobj,
-                                                      KOBJ_ONLINE);
-                               else
-                                       printk(KERN_WARNING
-                                              "Failed to add container\n");
-                       }
-               } else {
+               if (!present) {
                        if (ACPI_SUCCESS(status)) {
                                /* device exist and this is a remove request */
+                               device->flags.eject_pending = 1;
                                kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
+                               return;
                        }
+                       break;
+               }
+
+               if (!ACPI_FAILURE(status) || device)
+                       break;
+
+               result = container_device_add(&device, handle);
+               if (result) {
+                       printk(KERN_WARNING "Failed to add container\n");
+                       break;
                }
+
+               kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
+               ost_code = ACPI_OST_SC_SUCCESS;
                break;
+
        case ACPI_NOTIFY_EJECT_REQUEST:
                if (!acpi_bus_get_device(handle, &device) && device) {
+                       device->flags.eject_pending = 1;
                        kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
+                       return;
                }
                break;
+
        default:
-               break;
+               /* non-hotplug event; possibly handled by other handler */
+               return;
        }
+
+       /* Inform firmware that the hotplug operation has completed */
+       (void) acpi_evaluate_hotplug_ost(handle, type, ost_code, NULL);
        return;
 }