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block: fix missing nr_hw_queues update in blk_mq_realloc_tag_set_tags 

The commit ee9d55210c ("blk-mq: simplify blk_mq_realloc_tag_set_tags")
cleaned up the function blk_mq_realloc_tag_set_tags. After this change,
the function does not update nr_hw_queues of struct blk_mq_tag_set when
new nr_hw_queues value is smaller than original. This results in failure
of queue number change of block devices. To avoid the failure, add the
missing nr_hw_queues update.

Fixes: ee9d55210c ("blk-mq: simplify blk_mq_realloc_tag_set_tags")
Reported-by: Chaitanya Kulkarni <chaitanyak@nvidia.com>
Signed-off-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>
Link: https://lore.kernel.org/linux-block/20221118140640.featvt3fxktfquwh@shindev/
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20221122084917.2034220-1-shinichiro.kawasaki@wdc.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Shin'ichiro Kawasaki 2022-11-22 17:49:17 +09:00 committed by Jens Axboe
parent 3569788c08
commit d4b2e0d433
1 changed files with 2 additions and 2 deletions
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4
block/blk-mq.c
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@ -4381,7 +4381,7 @@ static int blk_mq_realloc_tag_set_tags(struct blk_mq_tag_set *set,
struct blk_mq_tags **new_tags;
if (set->nr_hw_queues >= new_nr_hw_queues)
return 0;
goto done;
new_tags = kcalloc_node(new_nr_hw_queues, sizeof(struct blk_mq_tags *),
GFP_KERNEL, set->numa_node);
@ -4393,8 +4393,8 @@ static int blk_mq_realloc_tag_set_tags(struct blk_mq_tag_set *set,
sizeof(*set->tags));
kfree(set->tags);
set->tags = new_tags;
done:
set->nr_hw_queues = new_nr_hw_queues;
return 0;
}