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elevator: fix double release of elevator module 

Our issue is descripted in below call path:
->elevator_init
 ->elevator_init_fn
  ->{cfq,deadline,noop}_init_queue
   ->elevator_alloc
    ->kzalloc_node
   fail to call kzalloc_node and then put module in elevator_alloc;
fail to call elevator_init_fn and then put module again in elevator_init.

Remove elevator_put invoking in error path of elevator_alloc to avoid
double release issue.

Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Reviewed-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
wifi-calibration
Chao Yu 2015-04-23 10:47:44 -06:00 committed by Jens Axboe
parent 464d1387ac
commit 8406a4d56e
1 changed files with 1 additions and 5 deletions
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6
block/elevator.c
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@ -157,7 +157,7 @@ struct elevator_queue *elevator_alloc(struct request_queue *q,
eq = kzalloc_node(sizeof(*eq), GFP_KERNEL, q->node);
if (unlikely(!eq))
goto err;
return NULL;
eq->type = e;
kobject_init(&eq->kobj, &elv_ktype);
@ -165,10 +165,6 @@ struct elevator_queue *elevator_alloc(struct request_queue *q,
hash_init(eq->hash);
return eq;
err:
kfree(eq);
elevator_put(e);
return NULL;
}
EXPORT_SYMBOL(elevator_alloc);