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block: Change elevator_init_mq() to always succeed

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If the default elevator chosen is mq-deadline, elevator_init_mq() may
return an error if mq-deadline initialization fails, leading to
blk_mq_init_allocated_queue() returning an error, which in turn will
cause the block device initialization to fail and the device not being
exposed.

Instead of taking such extreme measure, handle mq-deadline
initialization failures in the same manner as when mq-deadline is not
available (no module to load), that is, default to the "none" scheduler.
With this change, elevator_init_mq() return type can be changed to void.

Reviewed-by: Johannes Thumshirn <[email protected]>
Reviewed-by: Christoph Hellwig <[email protected]>
Reviewed-by: Ming Lei <[email protected]>
Signed-off-by: Damien Le Moal <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Damien Le Moal 2019-09-05 18:51:30 +09:00 • committed by Jens Axboe
commit 954b4a5ce4
3 changed files with 14 additions and 19 deletions
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2
block/blk.h
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@ -184,7 +184,7 @@ void blk_account_io_done(struct request *req, u64 now);
void blk_insert_flush(struct request *rq);
int elevator_init_mq(struct request_queue *q);
void elevator_init_mq(struct request_queue *q);
int elevator_switch_mq(struct request_queue *q,
struct elevator_type *new_e);
void __elevator_exit(struct request_queue *, struct elevator_queue *);