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SubjectRe: [PATCH] PCI Update for 2.6.3-rc1
ChangeSet 1.1500.11.17, 2004/02/04 10:03:35-08:00,

[PATCH] PCI: fix "pcibus_class" Device Class, release function

John Rose wrote:
> The function release_pcibus_dev() in probe.c defines the release procedure for
> device class pcibus_class. I want to suggest that this function be scrapped :)
> This release function is called in the code path of class_device_unregister().
> The pcibus_class devices aren't currently unregistered anywhere, from what I
> can tell, so this release function is currently unused. The runtime removal of
> PCI buses from logical partitions on PPC64 requires the unregistration of these
> class devices. The natural place to do this IMHO is in pci_remove_bus_device()
> in remove.c.

You're right that the class device isn't currently unregistered, and
that was an oversight in the patch I originally sent. Attatched is a
patch that remedies that situation. pci_remove_bus_device() *is* the
natural place to unregister the class_dev, and that's just what the
patch does.

> The problem is that this calls pci_destroy_dev(), which calls put() on the same
> "bridge" device that the release function does. This should only be done once
> in the course of removing a pci_bus, and I doubt that we want to change
> pci_destroy_dev(). The kfree() of the pci_bus struct is also done in both
> pci_remove_bus_device() and release_pcibus_dev().

Yep. The patch pulls the kfree() out of pci_remove_bus_device() and
calls class_device_unregister() in it's place. This will put() the
bridge device and free the pci_bus as needed. put() does need to be
called twice because the bridge device is get()'d twice: once when the
device is registered and once when it's bus device grabs a reference to it.

drivers/pci/remove.c | 2 +-
1 files changed, 1 insertion(+), 1 deletion(-)

diff -Nru a/drivers/pci/remove.c b/drivers/pci/remove.c
--- a/drivers/pci/remove.c Mon Feb 9 14:58:38 2004
+++ b/drivers/pci/remove.c Mon Feb 9 14:58:38 2004
@@ -83,7 +83,7 @@

- kfree(b);
+ class_device_unregister(&b->class_dev);
dev->subordinate = NULL;

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