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block: fix comment and add lockdep assert 

After commit b89f625e28 ("block: don't release queue's sysfs
lock during switching elevator"), whole elevator register and
unregister function are covered by sysfs_lock. So, remove wrong
comment and add lockdep assert.

Signed-off-by: Yufen Yu <yuyufen@huawei.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
zero-sugar-mainline-defconfig
Yufen Yu 2020-10-08 23:26:31 -04:00 committed by Jens Axboe
parent 0841031ab9
commit f0c6ae09db
1 changed files with 4 additions and 10 deletions
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14
block/elevator.c
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@ -479,16 +479,13 @@ static struct kobj_type elv_ktype = {
.release = elevator_release,
};
/*
* elv_register_queue is called from either blk_register_queue or
* elevator_switch, elevator switch is prevented from being happen
* in the two paths, so it is safe to not hold q->sysfs_lock.
*/
int elv_register_queue(struct request_queue *q, bool uevent)
{
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;
@ -507,13 +504,10 @@ int elv_register_queue(struct request_queue *q, bool uevent)
return error;
}
/*
* elv_unregister_queue is called from either blk_unregister_queue or
* elevator_switch, elevator switch is prevented from being happen
* in the two paths, so it is safe to not hold q->sysfs_lock.
*/
void elv_unregister_queue(struct request_queue *q)
{
lockdep_assert_held(&q->sysfs_lock);
if (q) {
struct elevator_queue *e = q->elevator;