arm: remove the mapping_error dma_map_ops method

Arm already returns (~(dma_addr_t)0x0) on mapping failures, so we can
switch over to returning DMA_MAPPING_ERROR and let the core dma-mapping
code handle the rest.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Russell King <rmk+kernel@armlinux.org.uk>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/arch/arm/common/dmabounce.c b/arch/arm/common/dmabounce.c
index 9a92de6..5ba4622 100644 (file)
--- a/arch/arm/common/dmabounce.c
+++ b/arch/arm/common/dmabounce.c
@@ -257,7 +257,7 @@ static inline dma_addr_t map_single(struct device *dev, void *ptr, size_t size,
        if (buf == NULL) {
                dev_err(dev, "%s: unable to map unsafe buffer %p!\n",
                       __func__, ptr);
-               return ARM_MAPPING_ERROR;
+               return DMA_MAPPING_ERROR;
        }
 
        dev_dbg(dev, "%s: unsafe buffer %p (dma=%#x) mapped to %p (dma=%#x)\n",
@@ -327,7 +327,7 @@ static dma_addr_t dmabounce_map_page(struct device *dev, struct page *page,
 
        ret = needs_bounce(dev, dma_addr, size);
        if (ret < 0)
-               return ARM_MAPPING_ERROR;
+               return DMA_MAPPING_ERROR;
 
        if (ret == 0) {
                arm_dma_ops.sync_single_for_device(dev, dma_addr, size, dir);
@@ -336,7 +336,7 @@ static dma_addr_t dmabounce_map_page(struct device *dev, struct page *page,
 
        if (PageHighMem(page)) {
                dev_err(dev, "DMA buffer bouncing of HIGHMEM pages is not supported\n");
-               return ARM_MAPPING_ERROR;
+               return DMA_MAPPING_ERROR;
        }
 
        return map_single(dev, page_address(page) + offset, size, dir, attrs);
@@ -453,11 +453,6 @@ static int dmabounce_dma_supported(struct device *dev, u64 dma_mask)
        return arm_dma_ops.dma_supported(dev, dma_mask);
 }
 
-static int dmabounce_mapping_error(struct device *dev, dma_addr_t dma_addr)
-{
-       return arm_dma_ops.mapping_error(dev, dma_addr);
-}
-
 static const struct dma_map_ops dmabounce_ops = {
        .alloc                  = arm_dma_alloc,
        .free                   = arm_dma_free,
@@ -472,7 +467,6 @@ static const struct dma_map_ops dmabounce_ops = {
        .sync_sg_for_cpu        = arm_dma_sync_sg_for_cpu,
        .sync_sg_for_device     = arm_dma_sync_sg_for_device,
        .dma_supported          = dmabounce_dma_supported,
-       .mapping_error          = dmabounce_mapping_error,
 };
 
 static int dmabounce_init_pool(struct dmabounce_pool *pool, struct device *dev,

diff --git a/arch/arm/include/asm/dma-iommu.h b/arch/arm/include/asm/dma-iommu.h
index 6821f12..772f48e 100644 (file)
--- a/arch/arm/include/asm/dma-iommu.h
+++ b/arch/arm/include/asm/dma-iommu.h
@@ -9,8 +9,6 @@
 #include <linux/dma-debug.h>
 #include <linux/kref.h>
 
-#define ARM_MAPPING_ERROR              (~(dma_addr_t)0x0)
-
 struct dma_iommu_mapping {
        /* iommu specific data */
        struct iommu_domain     *domain;

diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index 661fe48..2cfb17b 100644 (file)
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -179,11 +179,6 @@ static void arm_dma_sync_single_for_device(struct device *dev,
        __dma_page_cpu_to_dev(page, offset, size, dir);
 }
 
-static int arm_dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
-{
-       return dma_addr == ARM_MAPPING_ERROR;
-}
-
 const struct dma_map_ops arm_dma_ops = {
        .alloc                  = arm_dma_alloc,
        .free                   = arm_dma_free,
@@ -197,7 +192,6 @@ const struct dma_map_ops arm_dma_ops = {
        .sync_single_for_device = arm_dma_sync_single_for_device,
        .sync_sg_for_cpu        = arm_dma_sync_sg_for_cpu,
        .sync_sg_for_device     = arm_dma_sync_sg_for_device,
-       .mapping_error          = arm_dma_mapping_error,
        .dma_supported          = arm_dma_supported,
 };
 EXPORT_SYMBOL(arm_dma_ops);
@@ -217,7 +211,6 @@ const struct dma_map_ops arm_coherent_dma_ops = {
        .get_sgtable            = arm_dma_get_sgtable,
        .map_page               = arm_coherent_dma_map_page,
        .map_sg                 = arm_dma_map_sg,
-       .mapping_error          = arm_dma_mapping_error,
        .dma_supported          = arm_dma_supported,
 };
 EXPORT_SYMBOL(arm_coherent_dma_ops);
@@ -774,7 +767,7 @@ static void *__dma_alloc(struct device *dev, size_t size, dma_addr_t *handle,
        gfp &= ~(__GFP_COMP);
        args.gfp = gfp;
 
-       *handle = ARM_MAPPING_ERROR;
+       *handle = DMA_MAPPING_ERROR;
        allowblock = gfpflags_allow_blocking(gfp);
        cma = allowblock ? dev_get_cma_area(dev) : false;
 
@@ -1217,7 +1210,7 @@ static inline dma_addr_t __alloc_iova(struct dma_iommu_mapping *mapping,
        if (i == mapping->nr_bitmaps) {
                if (extend_iommu_mapping(mapping)) {
                        spin_unlock_irqrestore(&mapping->lock, flags);
-                       return ARM_MAPPING_ERROR;
+                       return DMA_MAPPING_ERROR;
                }
 
                start = bitmap_find_next_zero_area(mapping->bitmaps[i],
@@ -1225,7 +1218,7 @@ static inline dma_addr_t __alloc_iova(struct dma_iommu_mapping *mapping,
 
                if (start > mapping->bits) {
                        spin_unlock_irqrestore(&mapping->lock, flags);
-                       return ARM_MAPPING_ERROR;
+                       return DMA_MAPPING_ERROR;
                }
 
                bitmap_set(mapping->bitmaps[i], start, count);
@@ -1409,7 +1402,7 @@ __iommu_create_mapping(struct device *dev, struct page **pages, size_t size,
        int i;
 
        dma_addr = __alloc_iova(mapping, size);
-       if (dma_addr == ARM_MAPPING_ERROR)
+       if (dma_addr == DMA_MAPPING_ERROR)
                return dma_addr;
 
        iova = dma_addr;
@@ -1436,7 +1429,7 @@ __iommu_create_mapping(struct device *dev, struct page **pages, size_t size,
 fail:
        iommu_unmap(mapping->domain, dma_addr, iova-dma_addr);
        __free_iova(mapping, dma_addr, size);
-       return ARM_MAPPING_ERROR;
+       return DMA_MAPPING_ERROR;
 }
 
 static int __iommu_remove_mapping(struct device *dev, dma_addr_t iova, size_t size)
@@ -1497,7 +1490,7 @@ static void *__iommu_alloc_simple(struct device *dev, size_t size, gfp_t gfp,
                return NULL;
 
        *handle = __iommu_create_mapping(dev, &page, size, attrs);
-       if (*handle == ARM_MAPPING_ERROR)
+       if (*handle == DMA_MAPPING_ERROR)
                goto err_mapping;
 
        return addr;
@@ -1525,7 +1518,7 @@ static void *__arm_iommu_alloc_attrs(struct device *dev, size_t size,
        struct page **pages;
        void *addr = NULL;
 
-       *handle = ARM_MAPPING_ERROR;
+       *handle = DMA_MAPPING_ERROR;
        size = PAGE_ALIGN(size);
 
        if (coherent_flag  == COHERENT || !gfpflags_allow_blocking(gfp))
@@ -1546,7 +1539,7 @@ static void *__arm_iommu_alloc_attrs(struct device *dev, size_t size,
                return NULL;
 
        *handle = __iommu_create_mapping(dev, pages, size, attrs);
-       if (*handle == ARM_MAPPING_ERROR)
+       if (*handle == DMA_MAPPING_ERROR)
                goto err_buffer;
 
        if (attrs & DMA_ATTR_NO_KERNEL_MAPPING)
@@ -1696,10 +1689,10 @@ static int __map_sg_chunk(struct device *dev, struct scatterlist *sg,
        int prot;
 
        size = PAGE_ALIGN(size);
-       *handle = ARM_MAPPING_ERROR;
+       *handle = DMA_MAPPING_ERROR;
 
        iova_base = iova = __alloc_iova(mapping, size);
-       if (iova == ARM_MAPPING_ERROR)
+       if (iova == DMA_MAPPING_ERROR)
                return -ENOMEM;
 
        for (count = 0, s = sg; count < (size >> PAGE_SHIFT); s = sg_next(s)) {
@@ -1739,7 +1732,7 @@ static int __iommu_map_sg(struct device *dev, struct scatterlist *sg, int nents,
        for (i = 1; i < nents; i++) {
                s = sg_next(s);
 
-               s->dma_address = ARM_MAPPING_ERROR;
+               s->dma_address = DMA_MAPPING_ERROR;
                s->dma_length = 0;
 
                if (s->offset || (size & ~PAGE_MASK) || size + s->length > max) {
@@ -1914,7 +1907,7 @@ static dma_addr_t arm_coherent_iommu_map_page(struct device *dev, struct page *p
        int ret, prot, len = PAGE_ALIGN(size + offset);
 
        dma_addr = __alloc_iova(mapping, len);
-       if (dma_addr == ARM_MAPPING_ERROR)
+       if (dma_addr == DMA_MAPPING_ERROR)
                return dma_addr;
 
        prot = __dma_info_to_prot(dir, attrs);
@@ -1926,7 +1919,7 @@ static dma_addr_t arm_coherent_iommu_map_page(struct device *dev, struct page *p
        return dma_addr + offset;
 fail:
        __free_iova(mapping, dma_addr, len);
-       return ARM_MAPPING_ERROR;
+       return DMA_MAPPING_ERROR;
 }
 
 /**
@@ -2020,7 +2013,7 @@ static dma_addr_t arm_iommu_map_resource(struct device *dev,
        size_t len = PAGE_ALIGN(size + offset);
 
        dma_addr = __alloc_iova(mapping, len);
-       if (dma_addr == ARM_MAPPING_ERROR)
+       if (dma_addr == DMA_MAPPING_ERROR)
                return dma_addr;
 
        prot = __dma_info_to_prot(dir, attrs) | IOMMU_MMIO;
@@ -2032,7 +2025,7 @@ static dma_addr_t arm_iommu_map_resource(struct device *dev,
        return dma_addr + offset;
 fail:
        __free_iova(mapping, dma_addr, len);
-       return ARM_MAPPING_ERROR;
+       return DMA_MAPPING_ERROR;
 }
 
 /**
@@ -2105,7 +2098,6 @@ const struct dma_map_ops iommu_ops = {
        .map_resource           = arm_iommu_map_resource,
        .unmap_resource         = arm_iommu_unmap_resource,
 
-       .mapping_error          = arm_dma_mapping_error,
        .dma_supported          = arm_dma_supported,
 };
 
@@ -2124,7 +2116,6 @@ const struct dma_map_ops iommu_coherent_ops = {
        .map_resource   = arm_iommu_map_resource,
        .unmap_resource = arm_iommu_unmap_resource,
 
-       .mapping_error          = arm_dma_mapping_error,
        .dma_supported          = arm_dma_supported,
 };