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-rw-r--r--block/blk-mq.c12
-rw-r--r--block/elevator.c7
-rw-r--r--block/genhd.c9
-rw-r--r--drivers/md/dm-rq.c2
-rw-r--r--include/linux/blk-mq.h3
5 files changed, 28 insertions, 5 deletions
diff --git a/block/blk-mq.c b/block/blk-mq.c
index d10a7ab4207a..3647776a0f6e 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -2695,7 +2695,11 @@ struct request_queue *blk_mq_init_queue(struct blk_mq_tag_set *set)
if (!uninit_q)
return ERR_PTR(-ENOMEM);
- q = blk_mq_init_allocated_queue(set, uninit_q);
+ /*
+ * Initialize the queue without an elevator. device_add_disk() will do
+ * the initialization.
+ */
+ q = blk_mq_init_allocated_queue(set, uninit_q, false);
if (IS_ERR(q))
blk_cleanup_queue(uninit_q);
@@ -2846,7 +2850,8 @@ static unsigned int nr_hw_queues(struct blk_mq_tag_set *set)
}
struct request_queue *blk_mq_init_allocated_queue(struct blk_mq_tag_set *set,
- struct request_queue *q)
+ struct request_queue *q,
+ bool elevator_init)
{
/* mark the queue as mq asap */
q->mq_ops = set->ops;
@@ -2908,7 +2913,8 @@ struct request_queue *blk_mq_init_allocated_queue(struct blk_mq_tag_set *set,
blk_mq_add_queue_tag_set(set, q);
blk_mq_map_swqueue(q);
- elevator_init_mq(q);
+ if (elevator_init)
+ elevator_init_mq(q);
return q;
diff --git a/block/elevator.c b/block/elevator.c
index 520d6b224b74..096a670d22d7 100644
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -712,7 +712,14 @@ void elevator_init_mq(struct request_queue *q)
if (!e)
return;
+ blk_mq_freeze_queue(q);
+ blk_mq_quiesce_queue(q);
+
err = blk_mq_init_sched(q, e);
+
+ blk_mq_unquiesce_queue(q);
+ blk_mq_unfreeze_queue(q);
+
if (err) {
pr_warn("\"%s\" elevator initialization failed, "
"falling back to \"none\"\n", e->elevator_name);
diff --git a/block/genhd.c b/block/genhd.c
index 54f1f0d381f4..26b31fcae217 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -695,6 +695,15 @@ static void __device_add_disk(struct device *parent, struct gendisk *disk,
dev_t devt;
int retval;
+ /*
+ * The disk queue should now be all set with enough information about
+ * the device for the elevator code to pick an adequate default
+ * elevator if one is needed, that is, for devices requesting queue
+ * registration.
+ */
+ if (register_queue)
+ elevator_init_mq(disk->queue);
+
/* minors == 0 indicates to use ext devt from part0 and should
* be accompanied with EXT_DEVT flag. Make sure all
* parameters make sense.
diff --git a/drivers/md/dm-rq.c b/drivers/md/dm-rq.c
index 21d5c1784d0c..3f8577e2c13b 100644
--- a/drivers/md/dm-rq.c
+++ b/drivers/md/dm-rq.c
@@ -563,7 +563,7 @@ int dm_mq_init_request_queue(struct mapped_device *md, struct dm_table *t)
if (err)
goto out_kfree_tag_set;
- q = blk_mq_init_allocated_queue(md->tag_set, md->queue);
+ q = blk_mq_init_allocated_queue(md->tag_set, md->queue, true);
if (IS_ERR(q)) {
err = PTR_ERR(q);
goto out_tag_set;
diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index 62a3bb715899..0bf056de5cc3 100644
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -248,7 +248,8 @@ enum {
struct request_queue *blk_mq_init_queue(struct blk_mq_tag_set *);
struct request_queue *blk_mq_init_allocated_queue(struct blk_mq_tag_set *set,
- struct request_queue *q);
+ struct request_queue *q,
+ bool elevator_init);
struct request_queue *blk_mq_init_sq_queue(struct blk_mq_tag_set *set,
const struct blk_mq_ops *ops,
unsigned int queue_depth,