[PATCH v2 14/21] sparc/iommu: return error codes from .map_sg() ops

[Logan Gunthorpe <logang@xxxxxxxxxxxx>]

From: Martin Oliveira <martin.oliveira@xxxxxxxxxxxxx>

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@xxxxxxxxxxxxx>
Signed-off-by: Logan Gunthorpe <logang@xxxxxxxxxxxx>
Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
Cc: Niklas Schnelle <schnelle@xxxxxxxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
---
 arch/sparc/kernel/iommu.c     | 4 ++--
 arch/sparc/kernel/pci_sun4v.c | 4 ++--
 arch/sparc/mm/iommu.c         | 2 +-
 3 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/arch/sparc/kernel/iommu.c b/arch/sparc/kernel/iommu.c
index a034f571d869..0589acd34201 100644
--- a/arch/sparc/kernel/iommu.c
+++ b/arch/sparc/kernel/iommu.c
@@ -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
diff --git a/arch/sparc/kernel/pci_sun4v.c b/arch/sparc/kernel/pci_sun4v.c
index 9de57e88f7a1..d90e80fa5705 100644
--- a/arch/sparc/kernel/pci_sun4v.c
+++ b/arch/sparc/kernel/pci_sun4v.c
@@ -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,
diff --git a/arch/sparc/mm/iommu.c b/arch/sparc/mm/iommu.c
index 0c0342e5b10d..9e3f6933ca13 100644
--- a/arch/sparc/mm/iommu.c
+++ b/arch/sparc/mm/iommu.c
@@ -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;
        }
 
-- 
2.20.1