linux-kernel - [PATCH] pcie_portdriver: FIX: pcie_port_device

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Date:	Fri, 20 Feb 2009 20:16:07 -0800
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	jbarnes@...tuousgeek.org
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] pcie_portdriver: FIX: pcie_port_device_remove (take 2)


pcie_port_device_remove currently calls the remove method of port
drivers twice.  Ouch!

We are calling device_for_each_child multiple times for no apparent
reason.

So make it simple. Place put_device and device_unregister into
remove_iter, and throw out the rest.  Only call device_for_each_child
once.

The code is simpler and actually works!

Changelog:
v2 rebase against the linux-next tree so I don't conflict with Rafael's
   irq work, and remove the irq handling cleanups as Rafael's patch already
   made them.

Signed-off-by: Eric W. Biederman <ebiederm@...stanetworks.com>
---

 drivers/pci/pcie/portdrv_core.c |   23 +++--------------------
 1 files changed, 3 insertions(+), 20 deletions(-)

diff --git a/drivers/pci/pcie/portdrv_core.c b/drivers/pci/pcie/portdrv_core.c
index 3aea92a..569af00 100644
--- a/drivers/pci/pcie/portdrv_core.c
+++ b/drivers/pci/pcie/portdrv_core.c
@@ -456,16 +456,9 @@ int pcie_port_device_resume(struct pci_dev *dev)
 
 static int remove_iter(struct device *dev, void *data)
 {
-	struct pcie_port_service_driver *service_driver;
-
 	if (dev->bus == &pcie_port_bus_type) {
-		if (dev->driver) {
-			service_driver = to_service_driver(dev->driver);
-			if (service_driver->remove)
-				service_driver->remove(to_pcie_device(dev));
-		}
-		*(unsigned long*)data = (unsigned long)dev;
-		return 1;
+		put_device(dev);
+		device_unregister(dev);
 	}
 	return 0;
 }
@@ -480,18 +473,8 @@ static int remove_iter(struct device *dev, void *data)
 void pcie_port_device_remove(struct pci_dev *dev)
 {
 	struct pcie_port_data *port_data = pci_get_drvdata(dev);
-	int status;
-
-	do {
-		unsigned long device_addr;
 
-		status = device_for_each_child(&dev->dev, &device_addr, remove_iter);
-		if (status) {
-			struct device *device = (struct device*)device_addr;
-			put_device(device);
-			device_unregister(device);
-		}
-	} while (status);
+	device_for_each_child(&dev->dev, NULL, remove_iter);
 
 	switch (port_data->port_irq_mode) {
 	case PCIE_PORT_MSIX_MODE:
-- 
1.6.0.6

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