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block: enable polling by default if a poll map is initalized 

If the user did setup polling in the driver we should not require
another know in the block layer to enable it.

Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
hifive-unleashed-5.1
Christoph Hellwig 2018-12-02 17:46:28 +01:00 committed by Jens Axboe
parent 376f7ef8bf
commit 6544d229bf
1 changed files with 2 additions and 0 deletions
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2
block/blk-mq.c
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@ -2826,6 +2826,8 @@ struct request_queue *blk_mq_init_allocated_queue(struct blk_mq_tag_set *set,
q->tag_set = set;
q->queue_flags |= QUEUE_FLAG_MQ_DEFAULT;
if (set->nr_maps > HCTX_TYPE_POLL)
blk_queue_flag_set(QUEUE_FLAG_POLL, q);
if (!(set->flags & BLK_MQ_F_SG_MERGE))
blk_queue_flag_set(QUEUE_FLAG_NO_SG_MERGE, q);