1 files changed, 50 insertions, 5 deletions

diff --git a/drivers/acpi/container.c b/drivers/acpi/container.c
index e23151667655..0b6ae6eb5c4a 100644
--- a/drivers/acpi/container.c
+++ b/drivers/acpi/container.c
@@ -27,8 +27,7 @@
  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  */
 #include <linux/acpi.h>
-
-#include "internal.h"
+#include <linux/container.h>
 
 #include "internal.h"
 
@@ -44,19 +43,65 @@ static const struct acpi_device_id container_device_ids[] = {
         {"", 0},
 };
 
-static int container_device_attach(struct acpi_device *device,
+static int acpi_container_offline(struct container_dev *cdev)
+{
+        struct acpi_device *adev = ACPI_COMPANION(&cdev->dev);
+        struct acpi_device *child;
+
+        /* Check all of the dependent devices' physical companions. */
+        list_for_each_entry(child, &adev->children, node)
+                if (!acpi_scan_is_offline(child, false))
+                        return -EBUSY;
+
+        return 0;
+}
+
+static void acpi_container_release(struct device *dev)
+{
+        kfree(to_container_dev(dev));
+}
+
+static int container_device_attach(struct acpi_device *adev,
                                    const struct acpi_device_id *not_used)
 {
-        /* This is necessary for container hotplug to work. */
+        struct container_dev *cdev;
+        struct device *dev;
+        int ret;
+
+        cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
+        if (!cdev)
+                return -ENOMEM;
+
+        cdev->offline = acpi_container_offline;
+        dev = &cdev->dev;
+        dev->bus = &container_subsys;
+        dev_set_name(dev, "%s", dev_name(&adev->dev));
+        ACPI_COMPANION_SET(dev, adev);
+        dev->release = acpi_container_release;
+        ret = device_register(dev);
+        if (ret)
+                return ret;
+
+        adev->driver_data = dev;
         return 1;
 }
 
+static void container_device_detach(struct acpi_device *adev)
+{
+        struct device *dev = acpi_driver_data(adev);
+
+        adev->driver_data = NULL;
+        if (dev)
+                device_unregister(dev);
+}
+
 static struct acpi_scan_handler container_handler = {
         .ids = container_device_ids,
         .attach = container_device_attach,
+        .detach = container_device_detach,
         .hotplug = {
                 .enabled = true,
-                .mode = AHM_CONTAINER,
+                .demand_offline = true,
         },
 };