On Wed, Mar 03, 2021 at 03:30:15PM +0300, Sergei Shtepa wrote: > +bool blk_mq_is_queue_frozen(struct request_queue *q) > +{ > + bool ret; > + > + mutex_lock(&q->mq_freeze_lock); > + ret = percpu_ref_is_dying(&q->q_usage_counter) && percpu_ref_is_zero(&q->q_usage_counter); Please avoid the overly long line. Also maybe frozen is a better name for the variable currently called ret?