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blk-mq: collapse __blk_mq_drain_queue() into blk_mq_freeze_queue() 

Keeping __blk_mq_drain_queue() as a separate function doesn't buy us
anything and it's gonna be further simplified.  Let's flatten it into
its caller.

This patch doesn't make any functional change.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Nicholas A. Bellinger <nab@linux-iscsi.org>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Tejun Heo 2014-07-01 10:33:02 -06:00 committed by Jens Axboe
parent 780db2071a
commit 72d6f02a8d
1 changed files with 9 additions and 14 deletions
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23
block/blk-mq.c
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@ -108,8 +108,16 @@ static void blk_mq_queue_exit(struct request_queue *q)
__percpu_counter_add(&q->mq_usage_counter, -1, 1000000);
}
void blk_mq_drain_queue(struct request_queue *q)
/*
* Guarantee no request is in use, so we can change any data structure of
* the queue afterward.
*/
void blk_mq_freeze_queue(struct request_queue *q)
{
spin_lock_irq(q->queue_lock);
q->mq_freeze_depth++;
spin_unlock_irq(q->queue_lock);
while (true) {
s64 count;
@ -124,19 +132,6 @@ void blk_mq_drain_queue(struct request_queue *q)
}
}
/*
* Guarantee no request is in use, so we can change any data structure of
* the queue afterward.
*/
void blk_mq_freeze_queue(struct request_queue *q)
{
spin_lock_irq(q->queue_lock);
q->mq_freeze_depth++;
spin_unlock_irq(q->queue_lock);
blk_mq_drain_queue(q);
}
static void blk_mq_unfreeze_queue(struct request_queue *q)
{
bool wake = false;