diff options
Diffstat (limited to 'block/blk-mq-tag.c')
| -rw-r--r-- | block/blk-mq-tag.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/block/blk-mq-tag.c b/block/blk-mq-tag.c index 544edf2c56a5..1671dae43030 100644 --- a/block/blk-mq-tag.c +++ b/block/blk-mq-tag.c @@ -202,10 +202,14 @@ struct bt_iter_data { static struct request *blk_mq_find_and_get_req(struct blk_mq_tags *tags, unsigned int bitnr) { - struct request *rq = tags->rqs[bitnr]; + struct request *rq; + unsigned long flags; + spin_lock_irqsave(&tags->lock, flags); + rq = tags->rqs[bitnr]; if (!rq || !refcount_inc_not_zero(&rq->ref)) - return NULL; + rq = NULL; + spin_unlock_irqrestore(&tags->lock, flags); return rq; } @@ -538,6 +542,7 @@ struct blk_mq_tags *blk_mq_init_tags(unsigned int total_tags, tags->nr_tags = total_tags; tags->nr_reserved_tags = reserved_tags; + spin_lock_init(&tags->lock); if (blk_mq_is_sbitmap_shared(flags)) return tags; |