Revert "driver core: separate function to shutdown one device"

This reverts commit 95dc7565.

The series is being reverted before -rc1 as there are still reports of
lockups on shutdown, so it's not quite ready for "prime time."
Reported-by: Andrey Skvortsov <andrej.skvortzov@gmail.com>
Link: https://lore.kernel.org/r/ZvMkkhyJrohaajuk@skv.local
Cc: Christoph Hellwig <hch@lst.de>
Cc: David Jeffery <djeffery@redhat.com>
Cc: Keith Busch <kbusch@kernel.org>
Cc: Laurence Oberman <loberman@redhat.com>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Sagi Grimberg <sagi@grimberg.me>
Cc: Stuart Hayes <stuart.w.hayes@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/base/core.c

@@ -4779,41 +4779,6 @@ int device_change_owner(struct device *dev, kuid_t kuid, kgid_t kgid)
 }
 EXPORT_SYMBOL_GPL(device_change_owner);
 
-static void shutdown_one_device(struct device *dev)
-{
-	/* hold lock to avoid race with probe/release */
-	if (dev->parent && dev->bus && dev->bus->need_parent_lock)
-		device_lock(dev->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 (dev->parent && dev->bus && dev->bus->need_parent_lock)
-		device_unlock(dev->parent);
-
-	put_device(dev);
-	if (dev->parent)
-		put_device(dev->parent);
-}
-
 /**
  * device_shutdown - call ->shutdown() on each device to shutdown.
  */
@@ -4850,7 +4815,36 @@ void device_shutdown(void)
 		list_del_init(&dev->kobj.entry);
 		spin_unlock(&devices_kset->list_lock);
 
-		shutdown_one_device(dev);
+		/* hold lock to avoid race with probe/release */
+		if (parent && dev->bus && dev->bus->need_parent_lock)
+			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 && dev->bus && dev->bus->need_parent_lock)
+			device_unlock(parent);
+
+		put_device(dev);
+		put_device(parent);
 
 		spin_lock(&devices_kset->list_lock);
 	}