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block: invoke blk_mq_exit_sched no matter whether have .exit_sched 

We will register debugfs for scheduler no matter whether it have
defined callback funciton .exit_sched. So, blk_mq_exit_sched()
is always needed to unregister debugfs. Also, q->elevator should
be set as NULL after exiting scheduler.

For now, since all register scheduler have defined .exit_sched,
it will not cause any actual problem. But It will be more reasonable
to do this change.

Signed-off-by: Yufen Yu <yuyufen@huawei.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Yufen Yu 2020-10-08 23:26:27 -04:00 committed by Jens Axboe
parent 7ea6bf2e6c
commit dd1c372d65
2 changed files with 1 additions and 3 deletions
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1
block/blk-sysfs.c
View File

@ -740,7 +740,6 @@ static void blk_exit_queue(struct request_queue *q)
if (q->elevator) {
ioc_clear_queue(q);
__elevator_exit(q, q->elevator);
q->elevator = NULL;
}
/*

3
block/elevator.c
View File

@ -191,8 +191,7 @@ static void elevator_release(struct kobject *kobj)
void __elevator_exit(struct request_queue *q, struct elevator_queue *e)
{
mutex_lock(&e->sysfs_lock);
if (e->type->ops.exit_sched)
blk_mq_exit_sched(q, e);
blk_mq_exit_sched(q, e);
mutex_unlock(&e->sysfs_lock);
kobject_put(&e->kobj);