thor Tejun Heo 1330982097 -0800 committer Jens Axboe 1331065641 +0100 elevator: make elevator_init_fn() return 0/-errno elevator_ops->elevator_init_fn() has a weird return value. It returns a void * which the caller should assign to q->elevator->elevator_data and %NULL return denotes init failure. Update such that it returns integer 0/-errno and sets elevator_data directly as necessary. This makes the interface more conventional and eases further cleanup. Signed-off-by: Tejun Heo Cc: Vivek Goyal Signed-off-by: Jens Axboe 6Tx