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sparc/iommu: return error codes from .map_sg() ops 

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

Returning an errno from __sbus_iommu_map_sg() results in
sbus_iommu_map_sg_gflush() and sbus_iommu_map_sg_pflush() returning an
errno, as those functions are wrappers around __sbus_iommu_map_sg().

Signed-off-by: Martin Oliveira <martin.oliveira@eideticom.com>
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Niklas Schnelle <schnelle@linux.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Martin Oliveira 2021-07-29 14:15:32 -06:00 committed by Christoph Hellwig
parent 7e4e7d4c54
commit e02373fddb
3 changed files with 5 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/sparc/kernel/iommu.c
View File

@ -448,7 +448,7 @@ static int dma_4u_map_sg(struct device *dev, struct scatterlist *sglist,
iommu = dev->archdata.iommu;
strbuf = dev->archdata.stc;
if (nelems == 0 || !iommu)
return 0;
return -EINVAL;
spin_lock_irqsave(&iommu->lock, flags);
@ -580,7 +580,7 @@ static int dma_4u_map_sg(struct device *dev, struct scatterlist *sglist,
}
spin_unlock_irqrestore(&iommu->lock, flags);
return 0;
return -EINVAL;
}
/* If contexts are being used, they are the same in all of the mappings

4
arch/sparc/kernel/pci_sun4v.c
View File

@ -486,7 +486,7 @@ static int dma_4v_map_sg(struct device *dev, struct scatterlist *sglist,
iommu = dev->archdata.iommu;
if (nelems == 0 || !iommu)
return 0;
return -EINVAL;
atu = iommu->atu;
prot = HV_PCI_MAP_ATTR_READ;
@ -619,7 +619,7 @@ static int dma_4v_map_sg(struct device *dev, struct scatterlist *sglist,
}
local_irq_restore(flags);
return 0;
return -EINVAL;
}
static void dma_4v_unmap_sg(struct device *dev, struct scatterlist *sglist,

2
arch/sparc/mm/iommu.c
View File

@ -256,7 +256,7 @@ static int __sbus_iommu_map_sg(struct device *dev, struct scatterlist *sgl,
sg->dma_address =__sbus_iommu_map_page(dev, sg_page(sg),
sg->offset, sg->length, per_page_flush);
if (sg->dma_address == DMA_MAPPING_ERROR)
return 0;
return -EIO;
sg->dma_length = sg->length;
}