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[S390] ccwgroup device unregister.

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Work around the problem that a device cannot be unregistered from
driver_for_each_device() because of klist node refcounting: Get device
after device owned by the driver to be unregistered with driver_find_device()
and then unregister it. This works because driver_get_device() gets us out of
the region of the elevated klist node refcount. driver_find_device() will
always get the next device in the list after the found one has been
unregistered.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Cornelia Huck 2006-06-29 14:56:52 +02:00 committed by Martin Schwidefsky
parent 231caa1cac
commit 887ab59929
1 changed files with 10 additions and 7 deletions
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17
drivers/s390/cio/ccwgroup.c
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@ -404,21 +404,24 @@ ccwgroup_driver_register (struct ccwgroup_driver *cdriver)
}
static int
__ccwgroup_driver_unregister_device(struct device *dev, void *data)
__ccwgroup_match_all(struct device *dev, void *data)
{
__ccwgroup_remove_symlinks(to_ccwgroupdev(dev));
device_unregister(dev);
put_device(dev);
return 0;
return 1;
}
void
ccwgroup_driver_unregister (struct ccwgroup_driver *cdriver)
{
struct device *dev;
/* We don't want ccwgroup devices to live longer than their driver. */
get_driver(&cdriver->driver);
driver_for_each_device(&cdriver->driver, NULL, NULL,
__ccwgroup_driver_unregister_device);
while ((dev = driver_find_device(&cdriver->driver, NULL, NULL,
__ccwgroup_match_all))) {
__ccwgroup_remove_symlinks(to_ccwgroupdev(dev));
device_unregister(dev);
put_device(dev);
}
put_driver(&cdriver->driver);
driver_unregister(&cdriver->driver);
}