Messages in this thread Patch in this message | | | Date | Wed, 14 Jun 2006 15:59:50 +0200 | From | Martin Schwidefsky <> | Subject | [patch 6/24] s390: ccwgroup device unregister. |
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From: Cornelia Huck <cornelia.huck@de.ibm.com>
[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> ---
drivers/s390/cio/ccwgroup.c | 17 ++++++++++------- 1 files changed, 10 insertions(+), 7 deletions(-)
diff -urpN linux-2.6/drivers/s390/cio/ccwgroup.c linux-2.6-patched/drivers/s390/cio/ccwgroup.c --- linux-2.6/drivers/s390/cio/ccwgroup.c 2006-06-14 14:29:18.000000000 +0200 +++ linux-2.6-patched/drivers/s390/cio/ccwgroup.c 2006-06-14 14:29:38.000000000 +0200 @@ -404,21 +404,24 @@ ccwgroup_driver_register (struct ccwgrou } 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); } - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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