linux-kernel - Re: [PATCH v2 13/21] s390/pci: don't set failed sg dma_address to DMA_MAPPING

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Date:   Mon, 02 Aug 2021 12:34:13 +0200
From:   Niklas Schnelle <schnelle@...ux.ibm.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>,
        Gerald Schaefer <gerald.schaefer@...ux.ibm.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>
Subject: Re: [PATCH v2 13/21] s390/pci: don't set failed sg dma_address to
 DMA_MAPPING_ERROR

On Fri, 2021-07-23 at 11:50 -0600, Logan Gunthorpe wrote:
> Setting the ->dma_address to DMA_MAPPING_ERROR is not part of
> the ->map_sg calling convention, so remove it.
> 
> Link: https://lore.kernel.org/linux-mips/20210716063241.GC13345@lst.de/
> Suggested-by: Christoph Hellwig <hch@....de>
> Signed-off-by: Logan Gunthorpe <logang@...tatee.com>
> Cc: Niklas Schnelle <schnelle@...ux.ibm.com>
> Cc: Gerald Schaefer <gerald.schaefer@...ux.ibm.com>
> Cc: Heiko Carstens <hca@...ux.ibm.com>
> Cc: Vasily Gorbik <gor@...ux.ibm.com>
> Cc: Christian Borntraeger <borntraeger@...ibm.com>
> ---
>  arch/s390/pci/pci_dma.c | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/arch/s390/pci/pci_dma.c b/arch/s390/pci/pci_dma.c
> index c78b02012764..be48e5b5bfcf 100644
> --- a/arch/s390/pci/pci_dma.c
> +++ b/arch/s390/pci/pci_dma.c
> @@ -492,7 +492,6 @@ static int s390_dma_map_sg(struct device *dev, struct scatterlist *sg,
>  	for (i = 1; i < nr_elements; i++) {
>  		s = sg_next(s);
>  
> -		s->dma_address = DMA_MAPPING_ERROR;
>  		s->dma_length = 0;
>  
>  		if (s->offset || (size & ~PAGE_MASK) ||

Acked-by: Niklas Schnelle <schnelle@...ux.ibm.com>

Thanks!