From: Heinz Mauelshagen Date: Fri, 8 May 2015 08:19:03 +0000 (+1000) Subject: md-raid0: conditional mddev->queue access to suit dm-raid X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=b6538fe32966e63ef38897860ef220980d904974;p=linux-beck.git md-raid0: conditional mddev->queue access to suit dm-raid This patch is a prerequisite for dm-raid "raid0" support to allow dm-raid to access the MD RAID0 personality doing unconditional accesses to mddev->queue, which is NULL in case of dm-raid stacked on top of MD. Most of the conditional mddev->queue accesses made it to upstream but this missing one, which prohibits md raid0 to set disk stack limits (being done in dm core in case of md underneath dm). Signed-off-by: Heinz Mauelshagen Tested-by: Heinz Mauelshagen Signed-off-by: NeilBrown --- diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c index 2cb59a641cd2..6a68ef5246d4 100644 --- a/drivers/md/raid0.c +++ b/drivers/md/raid0.c @@ -188,8 +188,9 @@ static int create_strip_zones(struct mddev *mddev, struct r0conf **private_conf) } dev[j] = rdev1; - disk_stack_limits(mddev->gendisk, rdev1->bdev, - rdev1->data_offset << 9); + if (mddev->queue) + disk_stack_limits(mddev->gendisk, rdev1->bdev, + rdev1->data_offset << 9); if (rdev1->bdev->bd_disk->queue->merge_bvec_fn) conf->has_merge_bvec = 1;