md: raid10: add prerequisite to run underneath dm-raid

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 <heinzm@redhat.com>
Signed-off-by: Shaohua Li <shli@fb.com>

1 files changed, 8 insertions, 4 deletions

diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index e3fd725d5c4d..84e24e648165 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 ;