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authorJonathan Brassow <jbrassow@redhat.com>2012-10-11 06:38:58 +0400
committerNeilBrown <neilb@suse.de>2012-10-11 06:38:58 +0400
commit2863b9eb44787adecba4f977d71d7fd876805b1c (patch)
treee8d5417df70e9ade3b8e021426db6f22b4067b95 /drivers/md/md.c
parent1ca69c4bc4b1ef889861db39f325901eadbf9497 (diff)
downloadlinux-2863b9eb44787adecba4f977d71d7fd876805b1c.tar.xz
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>
Diffstat (limited to 'drivers/md/md.c')
-rw-r--r--drivers/md/md.c10
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c
index feab588adb50..85e6786653ea 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -2044,8 +2044,14 @@ EXPORT_SYMBOL(md_integrity_register);
/* 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;