3 files changed, 50 insertions, 7 deletions

diff --git a/drivers/acpi/container.c b/drivers/acpi/container.c
index 83d232c10f13..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"
 
@@ -44,16 +43,56 @@ static const struct acpi_device_id container_device_ids[] = {
 	{"", 0},
 };
 
+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)
 {
-	kobject_uevent(&adev->dev.kobj, KOBJ_ONLINE);
+	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)
 {
-	kobject_uevent(&adev->dev.kobj, KOBJ_OFFLINE);
+	struct device *dev = acpi_driver_data(adev);
+
+	adev->driver_data = NULL;
+	if (dev)
+		device_unregister(dev);
 }
 
 static struct acpi_scan_handler container_handler = {
@@ -62,6 +101,7 @@ static struct acpi_scan_handler container_handler = {
 	.detach = container_device_detach,
 	.hotplug = {
 		.enabled = true,
+		.demand_offline = true,
 	},
 };
 
diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h
index b125fdb0b30c..3375129bb5b7 100644
--- a/drivers/acpi/internal.h
+++ b/drivers/acpi/internal.h
@@ -73,6 +73,7 @@ static inline void acpi_lpss_init(void) {}
 #endif
 
 bool acpi_queue_hotplug_work(struct work_struct *work);
+bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent);
 
 /* --------------------------------------------------------------------------
                      Device Node Initialization / Removal
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 65243b9dd868..32b340171d41 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -126,7 +126,7 @@ acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, cha
 }
 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
 
-static bool acpi_scan_is_offline(struct acpi_device *adev)
+bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent)
 {
 	struct acpi_device_physical_node *pn;
 	bool offline = true;
@@ -135,7 +135,9 @@ static bool acpi_scan_is_offline(struct acpi_device *adev)
 
 	list_for_each_entry(pn, &adev->physical_node_list, node)
 		if (device_supports_offline(pn->dev) && !pn->dev->offline) {
-			kobject_uevent(&pn->dev->kobj, KOBJ_CHANGE);
+			if (uevent)
+				kobject_uevent(&pn->dev->kobj, KOBJ_CHANGE);
+
 			offline = false;
 			break;
 		}
@@ -267,7 +269,7 @@ static int acpi_scan_hot_remove(struct acpi_device *device)
 	acpi_status status;
 
 	if (device->handler->hotplug.demand_offline && !acpi_force_hot_remove) {
-		if (!acpi_scan_is_offline(device))
+		if (!acpi_scan_is_offline(device, true))
 			return -EBUSY;
 	} else {
 		int error = acpi_scan_try_to_offline(device);