[PATCH 3/3] blk-mq: Fix formula to calculate fair share of tags

[Alexander Gordeev]

Fair share of tags is number of tags diveded on number
of users. Not sure why it is different.

Signed-off-by: Alexander Gordeev <agordeev@xxxxxxxxxx>
Cc: Jens Axboe <axboe@xxxxxxxxx>
---
 block/blk-mq-tag.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/block/blk-mq-tag.c b/block/blk-mq-tag.c
index d1eb579..1b9c949 100644
--- a/block/blk-mq-tag.c
+++ b/block/blk-mq-tag.c
@@ -127,7 +127,7 @@ static inline bool hctx_may_queue(struct blk_mq_hw_ctx *hctx,
 	/*
 	 * Allow at least some tags
 	 */
-	depth = max((bt->depth + users - 1) / users, 4U);
+	depth = max(bt->depth / users, 4U);
 	return atomic_read(&hctx->nr_active) < depth;
 }
 
-- 
1.9.3

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