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-rw-r--r--block/elevator.c12
1 files changed, 10 insertions, 2 deletions
diff --git a/block/elevator.c b/block/elevator.c
index 7bda083..e87e9b4 100644
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -869,6 +869,8 @@ 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;
@@ -886,10 +888,11 @@ int elv_register_queue(struct request_queue *q)
}
return error;
}
-EXPORT_SYMBOL(elv_register_queue);
void elv_unregister_queue(struct request_queue *q)
{
+ lockdep_assert_held(&q->sysfs_lock);
+
if (q) {
struct elevator_queue *e = q->elevator;
@@ -900,7 +903,6 @@ void elv_unregister_queue(struct request_queue *q)
wbt_enable_default(q);
}
}
-EXPORT_SYMBOL(elv_unregister_queue);
int elv_register(struct elevator_type *e)
{
@@ -967,7 +969,10 @@ static int elevator_switch_mq(struct request_queue *q,
{
int ret;
+ lockdep_assert_held(&q->sysfs_lock);
+
blk_mq_freeze_queue(q);
+ blk_mq_quiesce_queue(q);
if (q->elevator) {
if (q->elevator->registered)
@@ -994,6 +999,7 @@ static int elevator_switch_mq(struct request_queue *q,
blk_add_trace_msg(q, "elv switch: none");
out:
+ blk_mq_unquiesce_queue(q);
blk_mq_unfreeze_queue(q);
return ret;
}
@@ -1010,6 +1016,8 @@ 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);
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