block: require blk_rq_prep_clone() be given an initialized clone request

Prepare to allow blk_rq_prep_clone() to accept clone requests that were
allocated from blk-mq request queues.  As such the blk_rq_prep_clone()
caller must first initialize the clone request.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index b98cd9d84435..f251633a51af 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1719,6 +1719,7 @@ static int setup_clone(struct request *clone, struct request *rq,
 {
         int r;
 
+        blk_rq_init(NULL, rq);
         r = blk_rq_prep_clone(clone, rq, tio->md->bs, GFP_ATOMIC,
                               dm_rq_bio_constructor, tio);
         if (r)