1 files changed, 30 insertions, 16 deletions

diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 1ee62bd25828..d04d0b33656c 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -1374,22 +1374,6 @@ static int acpi_device_set_context(struct acpi_device *device)
         return -ENODEV;
 }
 
-static acpi_status acpi_bus_remove(acpi_handle handle, u32 lvl_not_used,
-                                   void *not_used, void **ret_not_used)
-{
-        struct acpi_device *dev = NULL;
-
-        if (acpi_bus_get_device(handle, &dev))
-                return AE_OK;
-
-        dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
-        device_release_driver(&dev->dev);
-
-        acpi_device_unregister(dev);
-
-        return AE_OK;
-}
-
 static int acpi_add_single_object(struct acpi_device **child,
                                   acpi_handle handle, int type,
                                   unsigned long long sta, bool match_driver)
@@ -1642,9 +1626,39 @@ int acpi_bus_add(acpi_handle handle)
 }
 EXPORT_SYMBOL(acpi_bus_add);
 
+static acpi_status acpi_bus_device_detach(acpi_handle handle, u32 lvl_not_used,
+                                          void *not_used, void **ret_not_used)
+{
+        struct acpi_device *device = NULL;
+
+        if (!acpi_bus_get_device(handle, &device)) {
+                device->removal_type = ACPI_BUS_REMOVAL_EJECT;
+                device_release_driver(&device->dev);
+        }
+        return AE_OK;
+}
+
+static acpi_status acpi_bus_remove(acpi_handle handle, u32 lvl_not_used,
+                                   void *not_used, void **ret_not_used)
+{
+        struct acpi_device *device = NULL;
+
+        if (!acpi_bus_get_device(handle, &device))
+                acpi_device_unregister(device);
+
+        return AE_OK;
+}
+
 int acpi_bus_trim(struct acpi_device *start)
 {
         /*
+         * Execute acpi_bus_device_detach() as a post-order callback to detach
+         * all ACPI drivers from the device nodes being removed.
+         */
+        acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
+                            acpi_bus_device_detach, NULL, NULL);
+        acpi_bus_device_detach(start->handle, 0, NULL, NULL);
+        /*
          * Execute acpi_bus_remove() as a post-order callback to remove device
          * nodes in the given namespace scope.
          */