{
struct blk_mq_qe_pair *qe;
- if (!q->elevator)
- return true;
-
qe = kmalloc(sizeof(*qe), GFP_NOIO | __GFP_NOWARN | __GFP_NORETRY);
if (!qe)
return false;
/* q->elevator needs protection from ->sysfs_lock */
mutex_lock(&q->sysfs_lock);
+ /* the check has to be done with holding sysfs_lock */
+ if (!q->elevator) {
+ kfree(qe);
+ goto unlock;
+ }
+
INIT_LIST_HEAD(&qe->node);
qe->q = q;
qe->type = q->elevator->type;
__elevator_get(qe->type);
list_add(&qe->node, head);
elevator_disable(q);
+unlock:
mutex_unlock(&q->sysfs_lock);
return true;