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authorChristoph Hellwig <hch@lst.de>2018-05-31 19:11:39 +0200
committerJens Axboe <axboe@kernel.dk>2018-06-01 07:38:19 -0600
commitacddf3b308f6b6e23653de02e1abf98f402f1f12 (patch)
tree296aa44427ee604597d22412d212ae9744f7dd92
parentddb7253254fee6922764043101f8b28b6a00595d (diff)
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>
-rw-r--r--block/blk-core.c10
-rw-r--r--block/blk-mq-sched.c11
-rw-r--r--block/blk-mq-sched.h2
-rw-r--r--block/blk-mq.c2
-rw-r--r--block/elevator.c11
5 files changed, 8 insertions, 28 deletions
diff --git a/block/blk-core.c b/block/blk-core.c
index 18b691c93b63..cd573a33a6f3 100644
--- 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 fd4f68d61df0..b1f06088cee5 100644
--- 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 1e9c9018ace1..0cb8f938dff9 100644
--- 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 3d3952301b3e..858d6edff4d3 100644
--- 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 9276540af2a1..d6480e70816e 100644
--- 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;
}