Re: [PATCH] Driver Core patches for 2.6.7

[Greg KH <greg@kroah.com>]

ChangeSet 1.1722.89.53, 2004/06/04 14:53:48-07:00, Frank.A.Uepping@t-online.de

[PATCH] Driver Core: fix struct device::release issue

Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>


On Saturday 27 March 2004 02:14, Greg KH wrote:
> On Sat, Mar 06, 2004 at 12:47:24PM +0100, Frank A. Uepping wrote:
> > Hi,
> > if device_add fails (e.g. bus_add_device returns an error) then the release
> > method will be called for the device. Is this a bug or a feature?
>
> Are you sure this will happen?  device_initialize() gets a reference
> that is still present after device_add() fails, right?  So release()
> will not get called.
At the label PMError, kobject_unregister is called, which decrements the
recount by 2, which will result in calling release at label Done (put_device).

kobject_unregister should be superseded by kobject_del.
Here is a patch:


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


diff -Nru a/drivers/base/core.c b/drivers/base/core.c
--- a/drivers/base/core.c	Tue Jun 22 09:48:10 2004
+++ b/drivers/base/core.c	Tue Jun 22 09:48:10 2004
@@ -245,7 +245,7 @@
  BusError:
 	device_pm_remove(dev);
  PMError:
-	kobject_unregister(&dev->kobj);
+	kobject_del(&dev->kobj);
  Error:
 	if (parent)
 		put_device(parent);