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authorCornelia Huck <cornelia.huck@de.ibm.com>2006-06-29 14:56:52 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2006-06-29 14:56:52 +0200
commit887ab5992925736ab23985c35f8149739e9de354 (patch)
tree5979c930c1ba34341e04e541f98b0584c58ac62b /drivers/s390
parent231caa1cac555bdd5cb64bf91b554b38e8ddf715 (diff)
[S390] ccwgroup device unregister.
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>
Diffstat (limited to 'drivers/s390')
-rw-r--r--drivers/s390/cio/ccwgroup.c17
1 files changed, 10 insertions, 7 deletions
diff --git a/drivers/s390/cio/ccwgroup.c b/drivers/s390/cio/ccwgroup.c
index bdfee7fbaa2e..c7319a07ba35 100644
--- a/drivers/s390/cio/ccwgroup.c
+++ b/drivers/s390/cio/ccwgroup.c
@@ -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);
}