Commit a2584e43 authored May 07, 2020 by Weiping Zhang Committed by Jens Axboe May 09, 2020

block: save previous hardware queue count before udpate



blk_mq_realloc_tag_set_tags will update set->nr_hw_queues, so
save old set->nr_hw_queues before call this function.

Signed-off-by: Weiping Zhang <zhangweiping@didiglobal.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

parent 2e194422

block/blk-mq.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -3358,11 +3358,11 @@ static void __blk_mq_update_nr_hw_queues(struct blk_mq_tag_set *set,
		blk_mq_sysfs_unregister(q);
		}

		prev_nr_hw_queues = set->nr_hw_queues;
		if (blk_mq_realloc_tag_set_tags(set, set->nr_hw_queues, nr_hw_queues) <
		0)
		goto reregister;

		prev_nr_hw_queues = set->nr_hw_queues;
		set->nr_hw_queues = nr_hw_queues;
		blk_mq_update_queue_map(set);
		fallback:

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