blk-mq: remove blk_mq_delay_queue()

No driver uses this interface any more, so remove it.

Cc: Stefan Haberland <sth@linux.vnet.ibm.com>
Tested-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

2 files changed, 2 insertions, 29 deletions

diff --git a/block/blk-mq-debugfs.c b/block/blk-mq-debugfs.c
index 58b3b79cbe83..3080e18cb859 100644
--- a/block/blk-mq-debugfs.c
+++ b/block/blk-mq-debugfs.c
@@ -235,7 +235,6 @@ static const char *const hctx_state_name[] = {
         HCTX_STATE_NAME(STOPPED),
         HCTX_STATE_NAME(TAG_ACTIVE),
         HCTX_STATE_NAME(SCHED_RESTART),
-        HCTX_STATE_NAME(START_ON_RUN),
 };
 #undef HCTX_STATE_NAME
 
diff --git a/block/blk-mq.c b/block/blk-mq.c
index e05bd10d5c84..c2c6d276da3a 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -1562,40 +1562,14 @@ static void blk_mq_run_work_fn(struct work_struct *work)
         hctx = container_of(work, struct blk_mq_hw_ctx, run_work.work);
 
         /*
-         * If we are stopped, don't run the queue. The exception is if
-         * BLK_MQ_S_START_ON_RUN is set. For that case, we auto-clear
-         * the STOPPED bit and run it.
+         * If we are stopped, don't run the queue.
          */
-        if (test_bit(BLK_MQ_S_STOPPED, &hctx->state)) {
-                if (!test_bit(BLK_MQ_S_START_ON_RUN, &hctx->state))
-                        return;
-
-                clear_bit(BLK_MQ_S_START_ON_RUN, &hctx->state);
+        if (test_bit(BLK_MQ_S_STOPPED, &hctx->state))
                 clear_bit(BLK_MQ_S_STOPPED, &hctx->state);
-        }
 
         __blk_mq_run_hw_queue(hctx);
 }
 
-
-void blk_mq_delay_queue(struct blk_mq_hw_ctx *hctx, unsigned long msecs)
-{
-        if (WARN_ON_ONCE(!blk_mq_hw_queue_mapped(hctx)))
-                return;
-
-        /*
-         * Stop the hw queue, then modify currently delayed work.
-         * This should prevent us from running the queue prematurely.
-         * Mark the queue as auto-clearing STOPPED when it runs.
-         */
-        blk_mq_stop_hw_queue(hctx);
-        set_bit(BLK_MQ_S_START_ON_RUN, &hctx->state);
-        kblockd_mod_delayed_work_on(blk_mq_hctx_next_cpu(hctx),
-                                        &hctx->run_work,
-                                        msecs_to_jiffies(msecs));
-}
-EXPORT_SYMBOL(blk_mq_delay_queue);
-
 static inline void __blk_mq_insert_req_list(struct blk_mq_hw_ctx *hctx,
                                             struct request *rq,
                                             bool at_head)