Re: [PATCH v1 13/16] xen: swiotlb: return error code from xen_swiotlb_map_sg()

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To: Logan Gunthorpe <logang@xxxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, linux-alpha@xxxxxxxxxxxxxxx, linux-arm-kernel@xxxxxxxxxxxxxxxxxxx, linux-ia64@xxxxxxxxxxxxxxx, linux-mips@xxxxxxxxxxxxxxx, linuxppc-dev@xxxxxxxxxxxxxxxx, linux-s390@xxxxxxxxxxxxxxx, sparclinux@xxxxxxxxxxxxxxx, iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx, linux-parisc@xxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx
Subject: Re: [PATCH v1 13/16] xen: swiotlb: return error code from xen_swiotlb_map_sg()
From: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
Date: Mon, 19 Jul 2021 16:22:04 -0400
Cc: Christoph Hellwig <hch@xxxxxx>, Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>, Robin Murphy <robin.murphy@xxxxxxx>, Stephen Bates <sbates@xxxxxxxxxxxx>, Martin Oliveira <martin.oliveira@xxxxxxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>
In-reply-to: <20210715164544.6827-14-logang@deltatee.com>
References: <20210715164544.6827-1-logang@deltatee.com> <20210715164544.6827-14-logang@deltatee.com>
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:78.0) Gecko/20100101 Thunderbird/78.11.0

On 7/15/21 12:45 PM, Logan Gunthorpe wrote:
> From: Martin Oliveira <martin.oliveira@xxxxxxxxxxxxx>
>
> The .map_sg() op now expects an error code instead of zero on failure.
>
> xen_swiotlb_map_sg() may only fail if xen_swiotlb_map_page() fails, but
> xen_swiotlb_map_page() only supports returning errors as
> DMA_MAPPING_ERROR. So coalesce all errors into EINVAL.


Reviewed-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>

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References:
- [PATCH v1 00/16] .map_sg() error cleanup
  - From: Logan Gunthorpe
- [PATCH v1 13/16] xen: swiotlb: return error code from xen_swiotlb_map_sg()
  - From: Logan Gunthorpe

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