device: add device_shutdown_one() helper

euler inclusion
category: bugfix
bugzilla: 5452
CVE: NA

This patchset is add a kernel parameter to avoid kdump
problem on Hi1620ES. It will be revert when we have better
solution on Hi1620CS.

[PATCH 1/4] Revert "iommu/arm-smmu-v3: Abort all transactions if SMMU is enabled in kdump kernel"
[PATCH 2/4] device: add device_shutdown_one() helper
[PATCH 3/4] device: add device_shutdown_by_driver() helper
[PATCH 4/4] kexec: add kexec_device_shutdown()

------------------------------------------------

Move the shutdown device code into a new function
device_shutdown_one().
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

drivers/base/core.c

@@ -2854,6 +2854,40 @@ int device_move(struct device *dev, struct device *new_parent,
 }
 EXPORT_SYMBOL_GPL(device_move);
 
+static void device_shutdown_one(struct device *dev, struct device *parent)
+{
+	/* hold lock to avoid race with probe/release */
+	if (parent)
+		device_lock(parent);
+	device_lock(dev);
+
+	/* Don't allow any more runtime suspends */
+	pm_runtime_get_noresume(dev);
+	pm_runtime_barrier(dev);
+
+	if (dev->class && dev->class->shutdown_pre) {
+		if (initcall_debug)
+			dev_info(dev, "shutdown_pre\n");
+		dev->class->shutdown_pre(dev);
+	}
+	if (dev->bus && dev->bus->shutdown) {
+		if (initcall_debug)
+			dev_info(dev, "shutdown\n");
+		dev->bus->shutdown(dev);
+	} else if (dev->driver && dev->driver->shutdown) {
+		if (initcall_debug)
+			dev_info(dev, "shutdown\n");
+		dev->driver->shutdown(dev);
+	}
+
+	device_unlock(dev);
+	if (parent)
+		device_unlock(parent);
+
+	put_device(dev);
+	put_device(parent);
+}
+
 /**
  * device_shutdown - call ->shutdown() on each device to shutdown.
  */
@@ -2888,36 +2922,7 @@ void device_shutdown(void)
 		list_del_init(&dev->kobj.entry);
 		spin_unlock(&devices_kset->list_lock);
 
-		/* hold lock to avoid race with probe/release */
-		if (parent)
-			device_lock(parent);
-		device_lock(dev);
-
-		/* Don't allow any more runtime suspends */
-		pm_runtime_get_noresume(dev);
-		pm_runtime_barrier(dev);
-
-		if (dev->class && dev->class->shutdown_pre) {
-			if (initcall_debug)
-				dev_info(dev, "shutdown_pre\n");
-			dev->class->shutdown_pre(dev);
-		}
-		if (dev->bus && dev->bus->shutdown) {
-			if (initcall_debug)
-				dev_info(dev, "shutdown\n");
-			dev->bus->shutdown(dev);
-		} else if (dev->driver && dev->driver->shutdown) {
-			if (initcall_debug)
-				dev_info(dev, "shutdown\n");
-			dev->driver->shutdown(dev);
-		}
-
-		device_unlock(dev);
-		if (parent)
-			device_unlock(parent);
-
-		put_device(dev);
-		put_device(parent);
+		device_shutdown_one(dev, parent);
 
 		spin_lock(&devices_kset->list_lock);
 	}