From 90cde5584a34e210850728bebee4c6fb1a7124ba Mon Sep 17 00:00:00 2001 From: Andre Przywara Date: Mon, 14 Sep 2015 17:49:02 +0100 Subject: [PATCH] ARM: 8437/1: dma-mapping: fix build warning with new DMA_ERROR_CODE definition Commit 96231b2686b5: ("ARM: 8419/1: dma-mapping: harmonize definition of DMA_ERROR_CODE") changed the definition of DMA_ERROR_CODE to use dma_addr_t, which makes the compiler barf on assigning this to an "int" variable on ARM with LPAE enabled: ************* In file included from /src/linux/include/linux/dma-mapping.h:86:0, from /src/linux/arch/arm/mm/dma-mapping.c:21: /src/linux/arch/arm/mm/dma-mapping.c: In function '__iommu_create_mapping': /src/linux/arch/arm/include/asm/dma-mapping.h:16:24: warning: overflow in implicit constant conversion [-Woverflow] #define DMA_ERROR_CODE (~(dma_addr_t)0x0) ^ /src/linux/arch/arm/mm/dma-mapping.c:1252:15: note: in expansion of macro DMA_ERROR_CODE' int i, ret = DMA_ERROR_CODE; ^ ************* Remove the actually unneeded initialization of "ret" in __iommu_create_mapping() and move the variable declaration inside the for-loop to make the scope of this variable more clear. Signed-off-by: Andre Przywara Signed-off-by: Russell King --- arch/arm/mm/dma-mapping.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c index cba12f34ff77..3594543a4e9d 100644 --- a/arch/arm/mm/dma-mapping.c +++ b/arch/arm/mm/dma-mapping.c @@ -1257,7 +1257,7 @@ __iommu_create_mapping(struct device *dev, struct page **pages, size_t size) struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(dev); unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT; dma_addr_t dma_addr, iova; - int i, ret = DMA_ERROR_CODE; + int i; dma_addr = __alloc_iova(mapping, size); if (dma_addr == DMA_ERROR_CODE) @@ -1265,6 +1265,8 @@ __iommu_create_mapping(struct device *dev, struct page **pages, size_t size) iova = dma_addr; for (i = 0; i < count; ) { + int ret; + unsigned int next_pfn = page_to_pfn(pages[i]) + 1; phys_addr_t phys = page_to_phys(pages[i]); unsigned int len, j;