linux-kernel - Re: [PATCH v1 13/16] xen: swiotlb: return error code from xen_swiotlb_map

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Date:   Mon, 19 Jul 2021 16:22:04 -0400
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Logan Gunthorpe <logang@...tatee.com>,
        linux-kernel@...r.kernel.org, linux-alpha@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-ia64@...r.kernel.org,
        linux-mips@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-s390@...r.kernel.org, sparclinux@...r.kernel.org,
        iommu@...ts.linux-foundation.org, linux-parisc@...r.kernel.org,
        xen-devel@...ts.xenproject.org
Cc:     Christoph Hellwig <hch@....de>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>,
        Stephen Bates <sbates@...thlin.com>,
        Martin Oliveira <martin.oliveira@...eticom.com>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Juergen Gross <jgross@...e.com>,
        Stefano Stabellini <sstabellini@...nel.org>
Subject: Re: [PATCH v1 13/16] xen: swiotlb: return error code from
 xen_swiotlb_map_sg()


On 7/15/21 12:45 PM, Logan Gunthorpe wrote:
> From: Martin Oliveira <martin.oliveira@...eticom.com>
>
> 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@...cle.com>