iommu/dma: don't rely on DMA_ERROR_CODE

DMA_ERROR_CODE is not a public API and will go away soon.  dma dma-iommu
driver already implements a proper ->mapping_error method, so it's only
using the value internally.  Add a new local define using the value
that arm64 which is the only current user of dma-iommu.

Signed-off-by: Christoph Hellwig <hch@lst.de>

diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index 62618e77bedc9e2e8bf9ae241fcf127383735a73..9403336f1fa64f0290f44d1eed9b30402fba7814 100644 (file)
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -31,6 +31,8 @@
 #include <linux/scatterlist.h>
 #include <linux/vmalloc.h>
 
+#define IOMMU_MAPPING_ERROR    0
+
 struct iommu_dma_msi_page {
        struct list_head        list;
        dma_addr_t              iova;
@@ -500,7 +502,7 @@ void iommu_dma_free(struct device *dev, struct page **pages, size_t size,
 {
        __iommu_dma_unmap(iommu_get_domain_for_dev(dev), *handle, size);
        __iommu_dma_free_pages(pages, PAGE_ALIGN(size) >> PAGE_SHIFT);
-       *handle = DMA_ERROR_CODE;
+       *handle = IOMMU_MAPPING_ERROR;
 }
 
 /**
@@ -533,7 +535,7 @@ struct page **iommu_dma_alloc(struct device *dev, size_t size, gfp_t gfp,
        dma_addr_t iova;
        unsigned int count, min_size, alloc_sizes = domain->pgsize_bitmap;
 
-       *handle = DMA_ERROR_CODE;
+       *handle = IOMMU_MAPPING_ERROR;
 
        min_size = alloc_sizes & -alloc_sizes;
        if (min_size < PAGE_SIZE) {
@@ -627,11 +629,11 @@ static dma_addr_t __iommu_dma_map(struct device *dev, phys_addr_t phys,
 
        iova = iommu_dma_alloc_iova(domain, size, dma_get_mask(dev), dev);
        if (!iova)
-               return DMA_ERROR_CODE;
+               return IOMMU_MAPPING_ERROR;
 
        if (iommu_map(domain, iova, phys - iova_off, size, prot)) {
                iommu_dma_free_iova(cookie, iova, size);
-               return DMA_ERROR_CODE;
+               return IOMMU_MAPPING_ERROR;
        }
        return iova + iova_off;
 }
@@ -671,7 +673,7 @@ static int __finalise_sg(struct device *dev, struct scatterlist *sg, int nents,
 
                s->offset += s_iova_off;
                s->length = s_length;
-               sg_dma_address(s) = DMA_ERROR_CODE;
+               sg_dma_address(s) = IOMMU_MAPPING_ERROR;
                sg_dma_len(s) = 0;
 
                /*
@@ -714,11 +716,11 @@ static void __invalidate_sg(struct scatterlist *sg, int nents)
        int i;
 
        for_each_sg(sg, s, nents, i) {
-               if (sg_dma_address(s) != DMA_ERROR_CODE)
+               if (sg_dma_address(s) != IOMMU_MAPPING_ERROR)
                        s->offset += sg_dma_address(s);
                if (sg_dma_len(s))
                        s->length = sg_dma_len(s);
-               sg_dma_address(s) = DMA_ERROR_CODE;
+               sg_dma_address(s) = IOMMU_MAPPING_ERROR;
                sg_dma_len(s) = 0;
        }
 }
@@ -836,7 +838,7 @@ void iommu_dma_unmap_resource(struct device *dev, dma_addr_t handle,
 
 int iommu_dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
 {
-       return dma_addr == DMA_ERROR_CODE;
+       return dma_addr == IOMMU_MAPPING_ERROR;
 }
 
 static struct iommu_dma_msi_page *iommu_dma_get_msi_page(struct device *dev,