Don't attempt md_integrity_register if there is no gendisk struct available.
When MD arrays are built via device-mapper, the gendisk structure is not
available via mddev.
Signed-off-by: Jonathan Brassow <jbrassow [at] redhat.com>
Index: linux-2.6/drivers/md/md.c
============================================================ =======
--- linux-2.6.orig/drivers/md/md.c
+++ linux-2.6/drivers/md/md.c
[at] [at] -1781,8 +1781,8 [at] [at] int md_integrity_register(mddev_t *mddev
if (list_empty(&mddev->disks))
return 0; /* nothing to do */
- if (blk_get_integrity(mddev->gendisk))
- return 0; /* already registered */
+ if (!mddev->gendisk || blk_get_integrity(mddev->gendisk))
+ return 0; /* shouldn't register, or already is */
list_for_each_entry(rdev, &mddev->disks, same_set) {
/* skip spares and non-functional disks */
if (test_bit(Faulty, &rdev->flags))
--
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