Re: [PATCH] blk-mq: put the reference of the io scheduler module after switching back

[Jinlong Chen]

> 
> But I don't see elevator_switch() release the referenct of the module
> it is switching from. It's still not balance to me.
> 

The reference count is released here:

elevator_switch_mq()
  --> elevator_exit()
    --> __elevator_exit()
      --> kobject_put()
        --> kobject_release()
          --> elevator_release()
            --> elevator_put()

What a deep call stack. :)

Sincerely,
Jinlong Chen