[PATCH for-next] block: fix missing nr_hw_queues update in blk_mq_realloc_tag_set_tags

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The commit ee9d55210c2f ("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: ee9d55210c2f ("blk-mq: simplify blk_mq_realloc_tag_set_tags")
Reported-by: Chaitanya Kulkarni <chaitanyak@xxxxxxxxxx>
Signed-off-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@xxxxxxx>
Link: https://lore.kernel.org/linux-block/20221118140640.featvt3fxktfquwh@shindev/
---
 block/blk-mq.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/block/blk-mq.c b/block/blk-mq.c
index a3a5fb4d4ef6..f72164429446 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -4385,7 +4385,7 @@ 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);
@@ -4397,8 +4397,8 @@ 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;
 }
 
-- 
2.37.1




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