From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christoph Hellwig <hch@infradead.org>
Subject: Re: [PATCH 6/6] block: Add 'BLK_MQ_RQ_QUEUE_DONE' return value
Date: Wed, 20 Jul 2016 22:53:51 -0700
Message-ID: <20160721055351.GA14568@infradead.org>
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To: Hannes Reinecke <hare@suse.de>
Cc: Jens Axboe <axboe@fb.com>, linux-block@vger.kernel.org, linux-scsi@vger.kernel.org, Damien Le Moal <damien.lemoal@hgst.com>, Hannes Reinecke <hare@suse.com>

On Tue, Jul 19, 2016 at 03:20:39PM +0200, Hannes Reinecke wrote:
> Add a return value BLK_MQ_RQ_QUEUE_DONE to terminate a request
> without error.

NAK.  You can just do a blk_mq_end_request on the request and return
0 from ->queue_rq.