[dm-devel] [PATCH] md: raid5: add prerequisite to run underneath dm-raid

[heinzm at redhat.com]

From: Heinz Mauelshagen <heinzm at redhat.com>

In case md runs underneath the dm-raid target, the mddev does not have
a request queue or gendisk, thus avoid accesses.

This patch adds a missing conditional to the raid5 personality.


Signed-of-by: Heinz Mauelshagen <heinzm at redhat.com>


---
 drivers/md/raid5.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 8ab8b65..ce79ce6 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -7574,8 +7574,10 @@ static void raid5_finish_reshape(struct mddev *mddev)
 
 		if (mddev->delta_disks > 0) {
 			md_set_array_sectors(mddev, raid5_size(mddev, 0, 0));
-			set_capacity(mddev->gendisk, mddev->array_sectors);
-			revalidate_disk(mddev->gendisk);
+			if (mddev->queue) {
+				set_capacity(mddev->gendisk, mddev->array_sectors);
+				revalidate_disk(mddev->gendisk);
+			}
 		} else {
 			int d;
 			spin_lock_irq(&conf->device_lock);
-- 
2.5.5