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Date:   Wed, 3 Nov 2021 08:22:23 +0100
From:   Christoph Hellwig <hch@lst.de>
To:     "chenxiang (M)" <chenxiang66@hisilicon.com>
Cc:     Christoph Hellwig <hch@lst.de>, Jens Axboe <axboe@kernel.dk>,
        Jeffle Xu <jefflexu@linux.alibaba.com>,
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Subject: Re: [PATCH 14/16] block: switch polling to be bio based
Message-ID: <20211103072223.GB31003@lst.de>
References: <20211012111226.760968-1-hch@lst.de> <20211012111226.760968-15-hch@lst.de> <beb633f4-4508-ea53-4a34-adf0f20cda85@hisilicon.com>
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On Wed, Nov 03, 2021 at 03:11:25PM +0800, chenxiang (M) wrote:
> For some scsi command sent by function __scsi_execute() without data, it 
> has request but no bio (bufflen = 0),
> then how to use bio_poll() for them ?

You can't send these requests as polled.  Note that these are passthrough
requests only.