[PATCH] md: raid10: add prerequisite to run underneath dm-raid

[heinzm]

From: Heinz Mauelshagen <hei...@redhat.com>

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

This patch adds two missing conditionals to the raid10 personality.


Signed-of-by: Heinz Mauelshagen <hei...@redhat.com>

---
 drivers/md/raid10.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index e3fd725..84e24e6 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -3782,8 +3782,10 @@ static int raid10_resize(struct mddev *mddev, sector_t 
sectors)
                        return ret;
        }
        md_set_array_sectors(mddev, size);
-       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);
+       }
        if (sectors > mddev->dev_sectors &&
            mddev->recovery_cp > oldsize) {
                mddev->recovery_cp = oldsize;
@@ -4593,8 +4595,10 @@ static void raid10_finish_reshape(struct mddev *mddev)
                        set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
                }
                mddev->resync_max_sectors = size;
-               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;
                for (d = conf->geo.raid_disks ;
-- 
2.5.5