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Date:   Mon, 7 Jun 2021 08:46:03 +0200
From:   Christoph Hellwig <hch@lst.de>
To:     Tianyu Lan <ltykernel@gmail.com>
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Subject: Re: [RFC PATCH V3 11/11] HV/Storvsc: Add Isolation VM support for
 storvsc driver
Message-ID: <20210607064603.GD24478@lst.de>
References: <20210530150628.2063957-1-ltykernel@gmail.com> <20210530150628.2063957-12-ltykernel@gmail.com>
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On Sun, May 30, 2021 at 11:06:28AM -0400, Tianyu Lan wrote:
> +				for (i = 0; i < request->hvpg_count; i++)
> +					dma_unmap_page(&device->device,
> +							request->dma_range[i].dma,
> +							request->dma_range[i].mapping_size,
> +							request->vstor_packet.vm_srb.data_in
> +							     == READ_TYPE ?
> +							DMA_FROM_DEVICE : DMA_TO_DEVICE);
> +				kfree(request->dma_range);

Unreadably long lines.  You probably want to factor the quoted code into
a little readable helper and do the same for the map side.