diff options
Diffstat (limited to 'block')
| -rw-r--r-- | block/blk-mq.c | 24 |
1 files changed, 10 insertions, 14 deletions
diff --git a/block/blk-mq.c b/block/blk-mq.c index 31df47443699..c382a34fe5ac 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -89,7 +89,8 @@ static int blk_mq_queue_enter(struct request_queue *q, gfp_t gfp) return -EBUSY; ret = wait_event_interruptible(q->mq_freeze_wq, - !q->mq_freeze_depth || blk_queue_dying(q)); + !atomic_read(&q->mq_freeze_depth) || + blk_queue_dying(q)); if (blk_queue_dying(q)) return -ENODEV; if (ret) @@ -112,13 +113,10 @@ static void blk_mq_usage_counter_release(struct percpu_ref *ref) void blk_mq_freeze_queue_start(struct request_queue *q) { - bool freeze; + int freeze_depth; - spin_lock_irq(q->queue_lock); - freeze = !q->mq_freeze_depth++; - spin_unlock_irq(q->queue_lock); - - if (freeze) { + freeze_depth = atomic_inc_return(&q->mq_freeze_depth); + if (freeze_depth == 1) { percpu_ref_kill(&q->mq_usage_counter); blk_mq_run_hw_queues(q, false); } @@ -143,13 +141,11 @@ EXPORT_SYMBOL_GPL(blk_mq_freeze_queue); void blk_mq_unfreeze_queue(struct request_queue *q) { - bool wake; + int freeze_depth; - spin_lock_irq(q->queue_lock); - wake = !--q->mq_freeze_depth; - WARN_ON_ONCE(q->mq_freeze_depth < 0); - spin_unlock_irq(q->queue_lock); - if (wake) { + freeze_depth = atomic_dec_return(&q->mq_freeze_depth); + WARN_ON_ONCE(freeze_depth < 0); + if (!freeze_depth) { percpu_ref_reinit(&q->mq_usage_counter); wake_up_all(&q->mq_freeze_wq); } @@ -2081,7 +2077,7 @@ void blk_mq_free_queue(struct request_queue *q) /* Basically redo blk_mq_init_queue with queue frozen */ static void blk_mq_queue_reinit(struct request_queue *q) { - WARN_ON_ONCE(!q->mq_freeze_depth); + WARN_ON_ONCE(!atomic_read(&q->mq_freeze_depth)); blk_mq_sysfs_unregister(q); |