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From:   Pingfan Liu <kernelfans@gmail.com>
To:     linux-kernel@vger.kernel.org
Cc:     Pingfan Liu <kernelfans@gmail.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        "Rafael J . Wysocki" <rafael.j.wysocki@intel.com>,
        Grygorii Strashko <grygorii.strashko@ti.com>,
        Christoph Hellwig <hch@infradead.org>,
        Bjorn Helgaas <helgaas@kernel.org>,
        Dave Young <dyoung@redhat.com>, linux-pci@vger.kernel.org,
        linuxppc-dev@lists.ozlabs.org
Subject: [PATCHv3 1/4] drivers/base: fold the routine of device's shutdown into a func
Date:   Tue,  3 Jul 2018 14:50:39 +0800
Message-Id: <1530600642-25090-2-git-send-email-kernelfans@gmail.com>
In-Reply-To: <1530600642-25090-1-git-send-email-kernelfans@gmail.com>
References: <1530600642-25090-1-git-send-email-kernelfans@gmail.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Pack the code into a function to ease the using and reading.

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: Grygorii Strashko <grygorii.strashko@ti.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Bjorn Helgaas <helgaas@kernel.org>
Cc: Dave Young <dyoung@redhat.com>
Cc: linux-pci@vger.kernel.org
Cc: linuxppc-dev@lists.ozlabs.org
Signed-off-by: Pingfan Liu <kernelfans@gmail.com>
---
 drivers/base/core.c | 100 +++++++++++++++++++++++++++-------------------------
 1 file changed, 52 insertions(+), 48 deletions(-)

diff --git a/drivers/base/core.c b/drivers/base/core.c
index df3e1a4..a48868f 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -2802,12 +2802,62 @@ int device_move(struct device *dev, struct device *new_parent,
 }
 EXPORT_SYMBOL_GPL(device_move);
 
+static void __device_shutdown(struct device *dev)
+{
+	struct device *parent;
+	/*
+	 * hold reference count of device's parent to
+	 * prevent it from being freed because parent's
+	 * lock is to be held
+	 */
+	parent = get_device(dev->parent);
+	get_device(dev);
+	/*
+	 * Make sure the device is off the kset list, in the
+	 * event that dev->*->shutdown() doesn't remove it.
+	 */
+	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);
+	spin_lock(&devices_kset->list_lock);
+}
+
 /**
  * device_shutdown - call ->shutdown() on each device to shutdown.
  */
 void device_shutdown(void)
 {
-	struct device *dev, *parent;
+	struct device *dev;
 
 	spin_lock(&devices_kset->list_lock);
 	/*
@@ -2818,53 +2868,7 @@ void device_shutdown(void)
 	while (!list_empty(&devices_kset->list)) {
 		dev = list_entry(devices_kset->list.prev, struct device,
 				kobj.entry);
-
-		/*
-		 * hold reference count of device's parent to
-		 * prevent it from being freed because parent's
-		 * lock is to be held
-		 */
-		parent = get_device(dev->parent);
-		get_device(dev);
-		/*
-		 * Make sure the device is off the kset list, in the
-		 * event that dev->*->shutdown() doesn't remove it.
-		 */
-		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);
-
-		spin_lock(&devices_kset->list_lock);
+		__device_shutdown(dev);
 	}
 	spin_unlock(&devices_kset->list_lock);
 }
-- 
2.7.4