diff options
Diffstat (limited to 'drivers/md/dm.c')
| -rw-r--r-- | drivers/md/dm.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/drivers/md/dm.c b/drivers/md/dm.c index 8921cd79422c..f215b8666448 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -1791,8 +1791,17 @@ static blk_qc_t dm_make_request(struct request_queue *q, struct bio *bio) int srcu_idx; struct dm_table *map; - if (dm_get_md_type(md) == DM_TYPE_REQUEST_BASED) + if (dm_get_md_type(md) == DM_TYPE_REQUEST_BASED) { + /* + * We are called with a live reference on q_usage_counter, but + * that one will be released as soon as we return. Grab an + * extra one as blk_mq_make_request expects to be able to + * consume a reference (which lives until the request is freed + * in case a request is allocated). + */ + percpu_ref_get(&q->q_usage_counter); return blk_mq_make_request(q, bio); + } map = dm_get_live_table(md, &srcu_idx); |