linux-kernel - Re: [PATCH 3/3] blk-mq: fix wait condition for tagset wait completed check

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Message-ID: <b53dad99-6a8e-402e-9330-597289ecd8fd@grimberg.me>
Date: Fri, 31 Jan 2025 10:13:47 +0200
From: Sagi Grimberg <sagi@...mberg.me>
To: Daniel Wagner <wagi@...nel.org>, Keith Busch <kbusch@...nel.org>,
 Jens Axboe <axboe@...nel.dk>, Christoph Hellwig <hch@....de>,
 Ming Lei <ming.lei@...hat.com>
Cc: James Smart <james.smart@...adcom.com>, Hannes Reinecke <hare@...e.de>,
 linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org,
 linux-block@...r.kernel.org
Subject: Re: [PATCH 3/3] blk-mq: fix wait condition for tagset wait completed
 check




On 28/01/2025 18:34, Daniel Wagner wrote:
> blk_mq_tagset_count_completed_reqs returns the number of completed
> requests. The only user of this function is
> blk_mq_tagset_wait_completed_request which wants to know how many
> request are not yet completed. Thus return the number of in flight
> requests and terminate the wait loop when there is no inflight request.
>
> Fixes: f9934a80f91d ("blk-mq: introduce blk_mq_tagset_wait_completed_request()")

Can you please describe what this patch is fixing? i.e. what is the 
observed bug?
It is not clear (to me) from the patch.