blk-mq: Avoid that blk_mq_delay_run_hw_queue() introduces unintended delays

Make sure that calling blk_mq_run_hw_queue() or
blk_mq_kick_requeue_list() triggers a queue run without delay even
if blk_mq_delay_run_hw_queue() has been called recently and if its
delay has not yet expired.

Reviewed-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

1 files changed, 3 insertions, 4 deletions

diff --git a/block/blk-mq.c b/block/blk-mq.c
index 0fc6c95e5a29..43e7449723e0 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -785,7 +785,7 @@ EXPORT_SYMBOL(blk_mq_add_to_requeue_list);
 
 void blk_mq_kick_requeue_list(struct request_queue *q)
 {
-        kblockd_schedule_delayed_work(&q->requeue_work, 0);
+        kblockd_mod_delayed_work_on(WORK_CPU_UNBOUND, &q->requeue_work, 0);
 }
 EXPORT_SYMBOL(blk_mq_kick_requeue_list);
 
@@ -1401,9 +1401,8 @@ static void __blk_mq_delay_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async,
                 put_cpu();
         }
 
-        kblockd_schedule_delayed_work_on(blk_mq_hctx_next_cpu(hctx),
-                                         &hctx->run_work,
-                                         msecs_to_jiffies(msecs));
+        kblockd_mod_delayed_work_on(blk_mq_hctx_next_cpu(hctx), &hctx->run_work,
+                                    msecs_to_jiffies(msecs));
 }
 
 void blk_mq_delay_run_hw_queue(struct blk_mq_hw_ctx *hctx, unsigned long msecs)