diff mbox

[4/8] blk-mq: use blk_mq_rq_state() instead of testing REQ_ATOM_COMPLETE

Message ID 20180108191542.379478-5-tj@kernel.org (mailing list archive)
State New, archived
Headers show

Commit Message

Tejun Heo Jan. 8, 2018, 7:15 p.m. UTC 
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(-)

Comments

Bart Van Assche Jan. 8, 2018, 10:03 p.m. UTC | #1 
On Mon, 2018-01-08 at 11:15 -0800, Tejun Heo wrote:
> 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.


Reviewed-by: Bart Van Assche <bart.vanassche@wdc.com>
diff mbox

Patch

diff --git a/block/blk-mq.c b/block/blk-mq.c
index 6587f0c..41bfd27 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
@@ -3017,7 +3016,8 @@  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);