linux-kernel - [PATCH v2 08/21] ia64/sba_iommu: return error code from sba_map_sg

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Date:   Fri, 23 Jul 2021 11:49:55 -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>,
        Michael Ellerman <mpe@...erman.id.au>,
        Niklas Schnelle <schnelle@...ux.ibm.com>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Subject: [PATCH v2 08/21] ia64/sba_iommu: return error code from sba_map_sg_attrs()

From: Martin Oliveira <martin.oliveira@...eticom.com>

The .map_sg() op now expects an error code instead of zero on failure.

In the case of a dma_mapping_error() return -EIO as the actual cause
is opaque here.

sba_coalesce_chunks() may only presently fail if sba_alloc_range()
fails, which in turn only fails if the iommu is out of mapping
resources, hence a -ENOMEM is used in that case.

Signed-off-by: Martin Oliveira <martin.oliveira@...eticom.com>
Signed-off-by: Logan Gunthorpe <logang@...tatee.com>
Cc: Michael Ellerman <mpe@...erman.id.au>
Cc: Niklas Schnelle <schnelle@...ux.ibm.com>
Cc: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
---
 arch/ia64/hp/common/sba_iommu.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/ia64/hp/common/sba_iommu.c b/arch/ia64/hp/common/sba_iommu.c
index 9148ddbf02e5..430c166b68cd 100644
--- a/arch/ia64/hp/common/sba_iommu.c
+++ b/arch/ia64/hp/common/sba_iommu.c
@@ -1458,8 +1458,8 @@ static int sba_map_sg_attrs(struct device *dev, struct scatterlist *sglist,
 		sglist->dma_length = sglist->length;
 		sglist->dma_address = sba_map_page(dev, sg_page(sglist),
 				sglist->offset, sglist->length, dir, attrs);
-		if (dma_mapping_error(dev, sglist->dma_address))
-			return 0;
+		if(dma_mapping_error(dev, sglist->dma_address))
+			return -EIO;
 		return 1;
 	}
 
@@ -1486,7 +1486,7 @@ static int sba_map_sg_attrs(struct device *dev, struct scatterlist *sglist,
 	coalesced = sba_coalesce_chunks(ioc, dev, sglist, nents);
 	if (coalesced < 0) {
 		sba_unmap_sg_attrs(dev, sglist, nents, dir, attrs);
-		return 0;
+		return -ENOMEM;
 	}
 
 	/*
-- 
2.20.1