linux-kernel - Re: [PATCH] nvme-pci: deduplicate empty request list checks in nvme_queue

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Message-ID: <20251119054848.GA20072@lst.de>
Date: Wed, 19 Nov 2025 06:48:48 +0100
From: Christoph Hellwig <hch@....de>
To: Caleb Sander Mateos <csander@...estorage.com>
Cc: Keith Busch <kbusch@...nel.org>, Jens Axboe <axboe@...nel.dk>,
	Christoph Hellwig <hch@....de>, Sagi Grimberg <sagi@...mberg.me>,
	linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] nvme-pci: deduplicate empty request list checks in
 nvme_queue_rqs()

On Tue, Nov 18, 2025 at 07:17:00PM -0700, Caleb Sander Mateos wrote:
> nvme_queue_rqs() checks that nvmeq is non-NULL before calling
> nvme_submit_cmds() and nvme_submit_cmds() checks that submit_list is
> non-empty before doing anything. A NULL nvmeq means no requests were
> processed from the rqlist in nvme_queue_rqs() since the last call to
> nvme_submit_cmds(), which implies submit_list is empty. So just check
> that submit_list is non-empty before calling nvme_submit_cmds() and drop
> the check for NULL nvmeq.

What is the rationale for this?  I had a hard time understanding the
logic in the new version, so I don't think this helps with readability
at least.