linux-kernel - [PATCH v2 15/21] sparc/iommu: don't set failed sg dma_address to DMA_MAPPING

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Date:   Fri, 23 Jul 2021 11:50:02 -0600
From:   Logan Gunthorpe <logang@...tatee.com>
To:     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>,
        Logan Gunthorpe <logang@...tatee.com>,
        "David S. Miller" <davem@...emloft.net>,
        Niklas Schnelle <schnelle@...ux.ibm.com>,
        Michael Ellerman <mpe@...erman.id.au>
Subject: [PATCH v2 15/21] sparc/iommu: don't set failed sg dma_address to DMA_MAPPING_ERROR

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: "David S. Miller" <davem@...emloft.net>
Cc: Niklas Schnelle <schnelle@...ux.ibm.com>
Cc: Michael Ellerman <mpe@...erman.id.au>
---
 arch/sparc/kernel/iommu.c     | 2 --
 arch/sparc/kernel/pci_sun4v.c | 2 --
 2 files changed, 4 deletions(-)

diff --git a/arch/sparc/kernel/iommu.c b/arch/sparc/kernel/iommu.c
index 0589acd34201..da0363692528 100644
--- a/arch/sparc/kernel/iommu.c
+++ b/arch/sparc/kernel/iommu.c
@@ -546,7 +546,6 @@ static int dma_4u_map_sg(struct device *dev, struct scatterlist *sglist,
 
 	if (outcount < incount) {
 		outs = sg_next(outs);
-		outs->dma_address = DMA_MAPPING_ERROR;
 		outs->dma_length = 0;
 	}
 
@@ -572,7 +571,6 @@ static int dma_4u_map_sg(struct device *dev, struct scatterlist *sglist,
 			iommu_tbl_range_free(&iommu->tbl, vaddr, npages,
 					     IOMMU_ERROR_CODE);
 
-			s->dma_address = DMA_MAPPING_ERROR;
 			s->dma_length = 0;
 		}
 		if (s == outs)
diff --git a/arch/sparc/kernel/pci_sun4v.c b/arch/sparc/kernel/pci_sun4v.c
index d90e80fa5705..384480971805 100644
--- a/arch/sparc/kernel/pci_sun4v.c
+++ b/arch/sparc/kernel/pci_sun4v.c
@@ -594,7 +594,6 @@ static int dma_4v_map_sg(struct device *dev, struct scatterlist *sglist,
 
 	if (outcount < incount) {
 		outs = sg_next(outs);
-		outs->dma_address = DMA_MAPPING_ERROR;
 		outs->dma_length = 0;
 	}
 
@@ -611,7 +610,6 @@ static int dma_4v_map_sg(struct device *dev, struct scatterlist *sglist,
 			iommu_tbl_range_free(tbl, vaddr, npages,
 					     IOMMU_ERROR_CODE);
 			/* XXX demap? XXX */
-			s->dma_address = DMA_MAPPING_ERROR;
 			s->dma_length = 0;
 		}
 		if (s == outs)
-- 
2.20.1