block: move sysfs_lock into elevator_init

Both callers take just around so function call, so move it in.
Also remove the now pointless blk_mq_sched_init wrapper.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
Tested-by: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/block/blk-core.c b/block/blk-core.c
index 18b691c..cd573a3 100644 (file)
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1175,16 +1175,8 @@ int blk_init_allocated_queue(struct request_queue *q)
 
        q->sg_reserved_size = INT_MAX;
 
-       /* Protect q->elevator from elevator_change */
-       mutex_lock(&q->sysfs_lock);
-
-       /* init elevator */
-       if (elevator_init(q)) {
-               mutex_unlock(&q->sysfs_lock);
+       if (elevator_init(q))
                goto out_exit_flush_rq;
-       }
-
-       mutex_unlock(&q->sysfs_lock);
        return 0;
 
 out_exit_flush_rq:

diff --git a/block/blk-mq-sched.c b/block/blk-mq-sched.c
index fd4f68d..b1f0608 100644 (file)
--- a/block/blk-mq-sched.c
+++ b/block/blk-mq-sched.c
@@ -647,14 +647,3 @@ void blk_mq_exit_sched(struct request_queue *q, struct elevator_queue *e)
        blk_mq_sched_tags_teardown(q);
        q->elevator = NULL;
 }
-
-int blk_mq_sched_init(struct request_queue *q)
-{
-       int ret;
-
-       mutex_lock(&q->sysfs_lock);
-       ret = elevator_init(q);
-       mutex_unlock(&q->sysfs_lock);
-
-       return ret;
-}

diff --git a/block/blk-mq-sched.h b/block/blk-mq-sched.h
index 1e9c901..0cb8f93 100644 (file)
--- a/block/blk-mq-sched.h
+++ b/block/blk-mq-sched.h
@@ -33,8 +33,6 @@ int blk_mq_sched_init_hctx(struct request_queue *q, struct blk_mq_hw_ctx *hctx,
 void blk_mq_sched_exit_hctx(struct request_queue *q, struct blk_mq_hw_ctx *hctx,
                            unsigned int hctx_idx);
 
-int blk_mq_sched_init(struct request_queue *q);
-
 static inline bool
 blk_mq_sched_bio_merge(struct request_queue *q, struct bio *bio)
 {

diff --git a/block/blk-mq.c b/block/blk-mq.c
index 3d39523..858d6ed 100644 (file)
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -2573,7 +2573,7 @@ struct request_queue *blk_mq_init_allocated_queue(struct blk_mq_tag_set *set,
        if (!(set->flags & BLK_MQ_F_NO_SCHED)) {
                int ret;
 
-               ret = blk_mq_sched_init(q);
+               ret = elevator_init(q);
                if (ret)
                        return ERR_PTR(ret);
        }

diff --git a/block/elevator.c b/block/elevator.c
index 9276540..d6480e7 100644 (file)
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -202,16 +202,15 @@ static void elevator_release(struct kobject *kobj)
 int elevator_init(struct request_queue *q)
 {
        struct elevator_type *e = NULL;
-       int err;
+       int err = 0;
 
        /*
         * q->sysfs_lock must be held to provide mutual exclusion between
         * elevator_switch() and here.
         */
-       lockdep_assert_held(&q->sysfs_lock);
-
+       mutex_lock(&q->sysfs_lock);
        if (unlikely(q->elevator))
-               return 0;
+               goto out_unlock;
 
        /*
         * Use the default elevator specified by config boot param for
@@ -237,7 +236,7 @@ int elevator_init(struct request_queue *q)
                        if (q->nr_hw_queues == 1)
                                e = elevator_get(q, "mq-deadline", false);
                        if (!e)
-                               return 0;
+                               goto out_unlock;
                } else
                        e = elevator_get(q, CONFIG_DEFAULT_IOSCHED, false);
 
@@ -255,6 +254,8 @@ int elevator_init(struct request_queue *q)
                err = e->ops.sq.elevator_init_fn(q, e);
        if (err)
                elevator_put(e);
+out_unlock:
+       mutex_unlock(&q->sysfs_lock);
        return err;
 }