[PATCH 3/6] blk-mq: use blk_mq_rq_state() instead of testing REQ_ATOM_COMPLETE

Tejun Heo
2017-12-09T19:25:54Z

blk_mq_check_inflight() and blk_mq_poll_hybrid_sleep() test
REQ_ATOM_COMPLETE to determine the request state. Both uses are
speculative and we can test REQ_ATOM_STARTED and blk_mq_rq_state() for
equivalent results. Replace the tests. This will allow removing
REQ_ATOM_COMPLETE usages from blk-mq.

Signed-off-by: Tejun Heo <tj@kernel.org>
---
block/blk-mq.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/block/blk-mq.c b/block/blk-mq.c
index 2d093f7..39b79bd 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -95,8 +95,7 @@ static void blk_mq_check_inflight(struct blk_mq_hw_ctx *hctx,
{
struct mq_inflight *mi = priv;

- if (test_bit(REQ_ATOM_STARTED, &rq->atomic_flags) &&
- !test_bit(REQ_ATOM_COMPLETE, &rq->atomic_flags)) {
+ if (blk_mq_rq_state(rq) == MQ_RQ_IN_FLIGHT) {
/*
* index[0] counts the specific partition that was asked
* for. index[1] counts the ones that are active on the
@@ -2950,7 +2949,8 @@ static bool blk_mq_poll_hybrid_sleep(struct request_queue *q,

hrtimer_init_sleeper(&hs, current);
do {
- if (test_bit(REQ_ATOM_COMPLETE, &rq->atomic_flags))
+ if (test_bit(REQ_ATOM_STARTED, &rq->atomic_flags) &&
+ blk_mq_rq_state(rq) != MQ_RQ_IN_FLIGHT)
break;
set_current_state(TASK_UNINTERRUPTIBLE);
hrtimer_start_expires(&hs.timer, mode);
--
2.9.5