MD RAID10: Prep for DM RAID10 device replacement capability
MD RAID10: Fix a couple potential kernel panics if RAID10 is used by dm-raid
When device-mapper uses the RAID10 personality through dm-raid.c, there is no
'gendisk' structure in mddev and some sysfs information is also not populated.
This patch avoids touching those non-existent structures.
Signed-off-by: Jonathan Brassow <jbrassow@rehdat.com>
Signed-off-by: NeilBrown <neilb@suse.de>
diff --git a/drivers/md/md.c b/drivers/md/md.c
index feab588..85e6786 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -2044,8 +2044,14 @@
/* Disable data integrity if non-capable/non-matching disk is being added */
void md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev)
{
- struct blk_integrity *bi_rdev = bdev_get_integrity(rdev->bdev);
- struct blk_integrity *bi_mddev = blk_get_integrity(mddev->gendisk);
+ struct blk_integrity *bi_rdev;
+ struct blk_integrity *bi_mddev;
+
+ if (!mddev->gendisk)
+ return;
+
+ bi_rdev = bdev_get_integrity(rdev->bdev);
+ bi_mddev = blk_get_integrity(mddev->gendisk);
if (!bi_mddev) /* nothing to do */
return;
