diff options
| author | Bart Van Assche <bart.vanassche@wdc.com> | 2018-01-17 11:48:09 -0800 |
|---|---|---|
| committer | Jason Liu <jason.hui.liu@nxp.com> | 2019-02-12 10:33:24 +0800 |
| commit | ad64bdbb0fd576d335106c2df508fd10b744c02c (patch) | |
| tree | 2b6385eb550464340cca529dd5837322a80252e3 /block | |
| parent | b6d3fae20bf3ccbe3a60d3addaa9cf04f6e876f2 (diff) | |
block: Document scheduler modification locking requirements
This patch does not change any functionality.
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
(cherry picked from commit 14a23498ba97683c6790b1bcd8b2cdfe9ad99797)
Diffstat (limited to 'block')
| -rw-r--r-- | block/elevator.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/block/elevator.c b/block/elevator.c index f041605d030c..d39315efd510 100644 --- a/block/elevator.c +++ b/block/elevator.c @@ -859,6 +859,8 @@ int elv_register_queue(struct request_queue *q) struct elevator_queue *e = q->elevator; int error; + lockdep_assert_held(&q->sysfs_lock); + error = kobject_add(&e->kobj, &q->kobj, "%s", "iosched"); if (!error) { struct elv_fs_entry *attr = e->type->elevator_attrs; @@ -879,6 +881,8 @@ int elv_register_queue(struct request_queue *q) void elv_unregister_queue(struct request_queue *q) { + lockdep_assert_held(&q->sysfs_lock); + if (q) { struct elevator_queue *e = q->elevator; @@ -955,6 +959,8 @@ static int elevator_switch_mq(struct request_queue *q, { int ret; + lockdep_assert_held(&q->sysfs_lock); + blk_mq_freeze_queue(q); if (q->elevator) { @@ -998,6 +1004,8 @@ static int elevator_switch(struct request_queue *q, struct elevator_type *new_e) bool old_registered = false; int err; + lockdep_assert_held(&q->sysfs_lock); + if (q->mq_ops) return elevator_switch_mq(q, new_e); |