[PATCH 4.15 098/122] blk-mq: dont call io scheds .requeue_request when requeueing rq to ->dispatch

From: Greg Kroah-Hartman
Date: Wed Mar 07 2018 - 15:25:33 EST


4.15-stable review patch. If anyone has any objections, please let me know.

------------------

From: Ming Lei <ming.lei@xxxxxxxxxx>

commit 105976f517791aed3b11f8f53b308a2069d42055 upstream.

__blk_mq_requeue_request() covers two cases:

- one is that the requeued request is added to hctx->dispatch, such as
blk_mq_dispatch_rq_list()

- another case is that the request is requeued to io scheduler, such as
blk_mq_requeue_request().

We should call io sched's .requeue_request callback only for the 2nd
case.

Cc: Paolo Valente <paolo.valente@xxxxxxxxxx>
Cc: Omar Sandoval <osandov@xxxxxx>
Fixes: bd166ef183c2 ("blk-mq-sched: add framework for MQ capable IO schedulers")
Cc: stable@xxxxxxxxxxxxxxx
Reviewed-by: Bart Van Assche <bart.vanassche@xxxxxxx>
Acked-by: Paolo Valente <paolo.valente@xxxxxxxxxx>
Signed-off-by: Ming Lei <ming.lei@xxxxxxxxxx>
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
block/blk-mq.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -655,7 +655,6 @@ static void __blk_mq_requeue_request(str

trace_block_rq_requeue(q, rq);
wbt_requeue(q->rq_wb, &rq->issue_stat);
- blk_mq_sched_requeue_request(rq);

if (test_and_clear_bit(REQ_ATOM_STARTED, &rq->atomic_flags)) {
if (q->dma_drain_size && blk_rq_bytes(rq))
@@ -667,6 +666,9 @@ void blk_mq_requeue_request(struct reque
{
__blk_mq_requeue_request(rq);

+ /* this request will be re-inserted to io scheduler queue */
+ blk_mq_sched_requeue_request(rq);
+
BUG_ON(blk_queued_rq(rq));
blk_mq_add_to_requeue_list(rq, true, kick_requeue_list);
}