linux-kernel - [PATCH v9 2/4] driver core: separate function to shutdown one device

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Message-Id: <20241009175746.46758-3-stuart.w.hayes@gmail.com>
Date: Wed,  9 Oct 2024 12:57:44 -0500
From: Stuart Hayes <stuart.w.hayes@...il.com>
To: linux-kernel@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J . Wysocki" <rafael@...nel.org>,
	Martin Belanger <Martin.Belanger@...l.com>,
	Oliver O'Halloran <oohall@...il.com>,
	Daniel Wagner <dwagner@...e.de>,
	Keith Busch <kbusch@...nel.org>,
	Lukas Wunner <lukas@...ner.de>,
	David Jeffery <djeffery@...hat.com>,
	Jeremy Allison <jallison@....com>,
	Jens Axboe <axboe@...com>,
	Christoph Hellwig <hch@....de>,
	Sagi Grimberg <sagi@...mberg.me>,
	linux-nvme@...ts.infradead.org,
	Nathan Chancellor <nathan@...nel.org>,
	Jan Kiszka <jan.kiszka@...mens.com>,
	Bert Karwatzki <spasswolf@....de>
Cc: Stuart Hayes <stuart.w.hayes@...il.com>
Subject: [PATCH v9 2/4] driver core: separate function to shutdown one device

Make a separate function for the part of device_shutdown() that does the
shutown for a single device.  This is in preparation for making device
shutdown asynchronous.

Signed-off-by: Stuart Hayes <stuart.w.hayes@...il.com>
Signed-off-by: David Jeffery <djeffery@...hat.com>
---
 drivers/base/core.c | 66 ++++++++++++++++++++++++---------------------
 1 file changed, 36 insertions(+), 30 deletions(-)

diff --git a/drivers/base/core.c b/drivers/base/core.c
index 2bf9730db056..4482382fb947 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -4779,6 +4779,41 @@ 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.
  */
@@ -4815,36 +4850,7 @@ 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 && 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);
+		shutdown_one_device(dev);
 
 		spin_lock(&devices_kset->list_lock);
 	}
-- 
2.39.3