linux-kernel - [RFC PATCH v1 1/6] PCI: change PCI device management logic to better follow device model

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Message-id: <1338787022-400-1-git-send-email-jiang.liu@huawei.com>
Date:	Mon, 04 Jun 2012 13:16:57 +0800
From:	Jiang Liu <jiang.liu@...wei.com>
To:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Yinghai Lu <yinghai@...nel.org>,
	Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>
Cc:	Jiang Liu <liuj97@...il.com>,
	Taku Izumi <izumi.taku@...fujitsu.com>,
	Don Dutile <ddutile@...hat.com>,
	Greg KH <gregkh@...uxfoundation.org>,
	Yijing Wang <wangyijing@...wei.com>,
	Keping Chen <chenkeping@...wei.com>, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [RFC PATCH v1 1/6] PCI: change PCI device management logic to better
 follow device model

From: Jiang Liu <liuj97@...il.com>

According to device model documentation, the way to add/remove device
object should be symmetric.

/**
 * device_del - delete device from system.
 * @dev: device.
 *
 * This is the first part of the device unregistration
 * sequence. This removes the device from the lists we control
 * from here, has it removed from the other driver model
 * subsystems it was added to in device_add(), and removes it
 * from the kobject hierarchy.
 *
 * NOTE: this should be called manually _iff_ device_add() was
 * also called manually.
 */

The rule here is to either use
1) device_register()/device_unregister()
or
2) device_initialize()/device_add()/device_del()/put_device().

So change PCI core to follow the rule and get rid of the redundant
pci_dev_get()/pci_dev_put() pair.

Signed-off-by: Jiang Liu <liuj97@...il.com>
---
 drivers/pci/probe.c  |    1 -
 drivers/pci/remove.c |    4 ++--
 2 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 0840409..dacca26 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -1294,7 +1294,6 @@ void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
 {
 	device_initialize(&dev->dev);
 	dev->dev.release = pci_release_dev;
-	pci_dev_get(dev);
 
 	dev->dev.dma_mask = &dev->dma_mask;
 	dev->dev.dma_parms = &dev->dma_parms;
diff --git a/drivers/pci/remove.c b/drivers/pci/remove.c
index 04a4861..6c07bc5 100644
--- a/drivers/pci/remove.c
+++ b/drivers/pci/remove.c
@@ -22,7 +22,7 @@ static void pci_stop_dev(struct pci_dev *dev)
 	if (dev->is_added) {
 		pci_proc_detach_device(dev);
 		pci_remove_sysfs_dev_files(dev);
-		device_unregister(&dev->dev);
+		device_del(&dev->dev);
 		dev->is_added = 0;
 	}
 
@@ -40,7 +40,7 @@ static void pci_destroy_dev(struct pci_dev *dev)
 	up_write(&pci_bus_sem);
 
 	pci_free_resources(dev);
-	pci_dev_put(dev);
+	put_device(&dev->dev);
 }
 
 /**
-- 
1.7.1


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