block: Make blk_mq_delay_kick_requeue_list() rerun the queue at a quiet time

[karo-tx-linux.git] / block / blk-mq.c

diff --git a/block/blk-mq.c b/block/blk-mq.c
index 6cef42f419a57d43ece64983915f3aefce7fefcf..535cbdf32aabb28de64e7613e748bfa7a73ade6a 100644 (file)
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -301,11 +301,12 @@ static struct request *blk_mq_get_request(struct request_queue *q,
        struct elevator_queue *e = q->elevator;
        struct request *rq;
        unsigned int tag;
+       struct blk_mq_ctx *local_ctx = NULL;
 
        blk_queue_enter_live(q);
        data->q = q;
        if (likely(!data->ctx))
-               data->ctx = blk_mq_get_ctx(q);
+               data->ctx = local_ctx = blk_mq_get_ctx(q);
        if (likely(!data->hctx))
                data->hctx = blk_mq_map_queue(q, data->ctx->cpu);
        if (op & REQ_NOWAIT)
@@ -324,6 +325,10 @@ static struct request *blk_mq_get_request(struct request_queue *q,
 
        tag = blk_mq_get_tag(data);
        if (tag == BLK_MQ_TAG_FAIL) {
+               if (local_ctx) {
+                       blk_mq_put_ctx(local_ctx);
+                       data->ctx = NULL;
+               }
                blk_queue_exit(q);
                return NULL;
        }
@@ -356,12 +361,12 @@ struct request *blk_mq_alloc_request(struct request_queue *q, unsigned int op,
 
        rq = blk_mq_get_request(q, NULL, op, &alloc_data);
 
-       blk_mq_put_ctx(alloc_data.ctx);
-       blk_queue_exit(q);
-
        if (!rq)
                return ERR_PTR(-EWOULDBLOCK);
 
+       blk_mq_put_ctx(alloc_data.ctx);
+       blk_queue_exit(q);
+
        rq->__data_len = 0;
        rq->__sector = (sector_t) -1;
        rq->bio = rq->biotail = NULL;
@@ -407,11 +412,11 @@ struct request *blk_mq_alloc_request_hctx(struct request_queue *q,
 
        rq = blk_mq_get_request(q, NULL, op, &alloc_data);
 
-       blk_queue_exit(q);
-
        if (!rq)
                return ERR_PTR(-EWOULDBLOCK);
 
+       blk_queue_exit(q);
+
        return rq;
 }
 EXPORT_SYMBOL_GPL(blk_mq_alloc_request_hctx);
@@ -679,8 +684,8 @@ EXPORT_SYMBOL(blk_mq_kick_requeue_list);
 void blk_mq_delay_kick_requeue_list(struct request_queue *q,
                                    unsigned long msecs)
 {
-       kblockd_schedule_delayed_work(&q->requeue_work,
-                                     msecs_to_jiffies(msecs));
+       kblockd_mod_delayed_work_on(WORK_CPU_UNBOUND, &q->requeue_work,
+                                   msecs_to_jiffies(msecs));
 }
 EXPORT_SYMBOL(blk_mq_delay_kick_requeue_list);
 
@@ -1547,10 +1552,8 @@ static blk_qc_t blk_mq_make_request(struct request_queue *q, struct bio *bio)
 
        blk_queue_split(q, &bio);
 
-       if (bio_integrity_enabled(bio) && bio_integrity_prep(bio)) {
-               bio_io_error(bio);
+       if (!bio_integrity_prep(bio))
                return BLK_QC_T_NONE;
-       }
 
        if (!is_flush_fua && !blk_queue_nomerges(q) &&
            blk_attempt_plug_merge(q, bio, &request_count, &same_queue_rq))