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From: Logan Gunthorpe <logang@deltatee.com>
To: linux-kernel@vger.kernel.org, linux-alpha@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org, linux-ia64@vger.kernel.org,
	linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
	linux-s390@vger.kernel.org, sparclinux@vger.kernel.org,
	iommu@lists.linux-foundation.org, linux-parisc@vger.kernel.org,
	xen-devel@lists.xenproject.org
Cc: Christoph Hellwig <hch@lst.de>,
	Marek Szyprowski <m.szyprowski@samsung.com>,
	Robin Murphy <robin.murphy@arm.com>,
	Stephen Bates <sbates@raithlin.com>,
	Martin Oliveira <martin.oliveira@eideticom.com>,
	Logan Gunthorpe <logang@deltatee.com>,
	Russell King <linux@armlinux.org.uk>,
	Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Subject: [PATCH v2 06/21] ARM/dma-mapping: return error code from .map_sg() ops
Date: Fri, 23 Jul 2021 11:49:53 -0600	[thread overview]
Message-ID: <20210723175008.22410-7-logang@deltatee.com> (raw)
In-Reply-To: <20210723175008.22410-1-logang@deltatee.com>

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

The .map_sg() op now expects an error code instead of zero on failure.
In the case of a DMA_MAPPING_ERROR, -EIO is returned. Otherwise,
-ENOMEM or -EINVAL is returned depending on the error from
__map_sg_chunk().

Signed-off-by: Martin Oliveira <martin.oliveira@eideticom.com>
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
---
 arch/arm/mm/dma-mapping.c | 25 ++++++++++++++++---------
 1 file changed, 16 insertions(+), 9 deletions(-)

diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index c4b8df2ad328..113b9cb3701b 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -980,7 +980,7 @@ int arm_dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
 {
 	const struct dma_map_ops *ops = get_dma_ops(dev);
 	struct scatterlist *s;
-	int i, j;
+	int i, j, ret;
 
 	for_each_sg(sg, s, nents, i) {
 #ifdef CONFIG_NEED_SG_DMA_LENGTH
@@ -988,15 +988,17 @@ int arm_dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
 #endif
 		s->dma_address = ops->map_page(dev, sg_page(s), s->offset,
 						s->length, dir, attrs);
-		if (dma_mapping_error(dev, s->dma_address))
+		if (dma_mapping_error(dev, s->dma_address)) {
+			ret = -EIO;
 			goto bad_mapping;
+		}
 	}
 	return nents;
 
  bad_mapping:
 	for_each_sg(sg, s, i, j)
 		ops->unmap_page(dev, sg_dma_address(s), sg_dma_len(s), dir, attrs);
-	return 0;
+	return ret;
 }
 
 /**
@@ -1622,7 +1624,7 @@ static int __iommu_map_sg(struct device *dev, struct scatterlist *sg, int nents,
 		     bool is_coherent)
 {
 	struct scatterlist *s = sg, *dma = sg, *start = sg;
-	int i, count = 0;
+	int i, count = 0, ret;
 	unsigned int offset = s->offset;
 	unsigned int size = s->offset + s->length;
 	unsigned int max = dma_get_max_seg_size(dev);
@@ -1634,8 +1636,10 @@ static int __iommu_map_sg(struct device *dev, struct scatterlist *sg, int nents,
 		s->dma_length = 0;
 
 		if (s->offset || (size & ~PAGE_MASK) || size + s->length > max) {
-			if (__map_sg_chunk(dev, start, size, &dma->dma_address,
-			    dir, attrs, is_coherent) < 0)
+			ret = __map_sg_chunk(dev, start, size,
+					     &dma->dma_address, dir, attrs,
+					     is_coherent);
+			if (ret < 0)
 				goto bad_mapping;
 
 			dma->dma_address += offset;
@@ -1648,8 +1652,9 @@ static int __iommu_map_sg(struct device *dev, struct scatterlist *sg, int nents,
 		}
 		size += s->length;
 	}
-	if (__map_sg_chunk(dev, start, size, &dma->dma_address, dir, attrs,
-		is_coherent) < 0)
+	ret = __map_sg_chunk(dev, start, size, &dma->dma_address, dir, attrs,
+			     is_coherent);
+	if (ret < 0)
 		goto bad_mapping;
 
 	dma->dma_address += offset;
@@ -1660,7 +1665,9 @@ static int __iommu_map_sg(struct device *dev, struct scatterlist *sg, int nents,
 bad_mapping:
 	for_each_sg(sg, s, count, i)
 		__iommu_remove_mapping(dev, sg_dma_address(s), sg_dma_len(s));
-	return 0;
+	if (ret == -ENOMEM)
+		return ret;
+	return -EINVAL;
 }
 
 /**
-- 
2.20.1


  parent reply	other threads:[~2021-07-23 17:51 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-23 17:49 [PATCH v2 00/21] .map_sg() error cleanup Logan Gunthorpe
2021-07-23 17:49 ` [PATCH v2 01/21] dma-mapping: Allow map_sg() ops to return negative error codes Logan Gunthorpe
2021-07-25  6:07   ` Christoph Hellwig
2021-07-23 17:49 ` [PATCH v2 02/21] dma-direct: Return appropriate error code from dma_direct_map_sg() Logan Gunthorpe
2021-07-23 17:49 ` [PATCH v2 03/21] iommu: Return full error code from iommu_map_sg[_atomic]() Logan Gunthorpe
2021-07-23 17:49 ` [PATCH v2 04/21] dma-iommu: Return error code from iommu_dma_map_sg() Logan Gunthorpe
2021-07-23 17:49 ` [PATCH v2 05/21] alpha: return error code from alpha_pci_map_sg() Logan Gunthorpe
2021-07-23 17:49 ` Logan Gunthorpe [this message]
2021-07-23 17:49 ` [PATCH v2 07/21] ARM/dma-mapping: don't set failed sg dma_address to DMA_MAPPING_ERROR Logan Gunthorpe
2021-07-23 17:49 ` [PATCH v2 08/21] ia64/sba_iommu: return error code from sba_map_sg_attrs() Logan Gunthorpe
2021-07-23 17:49 ` [PATCH v2 09/21] MIPS/jazzdma: return error code from jazz_dma_map_sg() Logan Gunthorpe
2021-07-23 17:49 ` [PATCH v2 10/21] powerpc/iommu: return error code from .map_sg() ops Logan Gunthorpe
2021-07-23 17:49 ` [PATCH v2 11/21] powerpc/iommu: don't set failed sg dma_address to DMA_MAPPING_ERROR Logan Gunthorpe
2021-07-23 17:49 ` [PATCH v2 12/21] s390/pci: return error code from s390_dma_map_sg() Logan Gunthorpe
2021-07-23 17:50 ` [PATCH v2 13/21] s390/pci: don't set failed sg dma_address to DMA_MAPPING_ERROR Logan Gunthorpe
2021-08-02 10:34   ` Niklas Schnelle
2021-07-23 17:50 ` [PATCH v2 14/21] sparc/iommu: return error codes from .map_sg() ops Logan Gunthorpe
2021-07-23 17:50 ` [PATCH v2 15/21] sparc/iommu: don't set failed sg dma_address to DMA_MAPPING_ERROR Logan Gunthorpe
2021-07-23 17:50 ` [PATCH v2 16/21] parisc: return error code from .map_sg() ops Logan Gunthorpe
2021-07-23 17:50 ` [PATCH v2 17/21] xen: swiotlb: return error code from xen_swiotlb_map_sg() Logan Gunthorpe
2021-07-23 17:50 ` [PATCH v2 18/21] x86/amd_gart: return error code from gart_map_sg() Logan Gunthorpe
2021-07-23 17:50 ` [PATCH v2 19/21] x86/amd_gart: don't set failed sg dma_address to DMA_MAPPING_ERROR Logan Gunthorpe
2021-07-23 17:50 ` [PATCH v2 20/21] dma-mapping: return error code from dma_dummy_map_sg() Logan Gunthorpe
2021-07-23 17:50 ` [PATCH v2 21/21] dma-mapping: Disallow .map_sg operations from returning zero on error Logan Gunthorpe
2021-07-24  6:22   ` Rolf Eike Beer

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