diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index e2f6d9d..42982b5 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -207,8 +207,6 @@
 		return -EINVAL;
 	}
 
-	lock_device_hotplug();
-
 	/*
 	 * Carry out two passes here and ignore errors in the first pass,
 	 * because if the devices in question are memory blocks and
@@ -239,9 +237,6 @@
 					    ACPI_UINT32_MAX,
 					    acpi_bus_online_companions, NULL,
 					    NULL, NULL);
-
-			unlock_device_hotplug();
-
 			put_device(&device->dev);
 			return -EBUSY;
 		}
@@ -252,8 +247,6 @@
 
 	acpi_bus_trim(device);
 
-	unlock_device_hotplug();
-
 	/* Device node has been unregistered. */
 	put_device(&device->dev);
 	device = NULL;
@@ -309,6 +302,7 @@
 	u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
 	int error;
 
+	lock_device_hotplug();
 	mutex_lock(&acpi_scan_lock);
 
 	acpi_bus_get_device(handle, &device);
@@ -332,6 +326,7 @@
 
  out:
 	mutex_unlock(&acpi_scan_lock);
+	unlock_device_hotplug();
 	return;
 
  err_out:
@@ -346,8 +341,8 @@
 	u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
 	int error;
 
-	mutex_lock(&acpi_scan_lock);
 	lock_device_hotplug();
+	mutex_lock(&acpi_scan_lock);
 
 	if (ost_source != ACPI_NOTIFY_BUS_CHECK) {
 		acpi_bus_get_device(handle, &device);
@@ -373,9 +368,9 @@
 		kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
 
  out:
-	unlock_device_hotplug();
 	acpi_evaluate_hotplug_ost(handle, ost_source, ost_code, NULL);
 	mutex_unlock(&acpi_scan_lock);
+	unlock_device_hotplug();
 }
 
 static void acpi_scan_bus_check(void *context)
@@ -466,6 +461,7 @@
 	acpi_handle handle = device->handle;
 	int error;
 
+	lock_device_hotplug();
 	mutex_lock(&acpi_scan_lock);
 
 	error = acpi_scan_hot_remove(device);
@@ -475,6 +471,7 @@
 					  NULL);
 
 	mutex_unlock(&acpi_scan_lock);
+	unlock_device_hotplug();
 	kfree(context);
 }
 EXPORT_SYMBOL(acpi_bus_hot_remove_device);