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Commit c3d0d491 authored by Liam Mark's avatar Liam Mark Committed by Charan Teja Reddy
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arm: dma-mapping: handle IOVA address zero 



The IOVA allocator used by these calls supports IOVA address
zero so properly handle IOVA address zero.

Change-Id: Iaaad45b42503f05f95d1333e010f6d8e3bdb1949
Signed-off-by: default avatarLiam Mark <lmark@codeaurora.org>
Signed-off-by: default avatarCharan Teja Reddy <charante@codeaurora.org>
parent 09b91702

arch/arm/mm/dma-mapping.c

+0 −9
Original line number Diff line number Diff line
@@ -2036,9 +2036,6 @@ static void arm_coherent_iommu_unmap_page(struct device *dev, dma_addr_t handle, 
	int offset = handle & ~PAGE_MASK;

	int len = PAGE_ALIGN(size + offset);



	if (!iova)

		return;



	iommu_unmap(mapping->domain, iova, len);

	__free_iova(mapping, iova, len);

}
@@ -2136,9 +2133,6 @@ static void arm_iommu_sync_single_for_cpu(struct device *dev, 
	struct page *page = phys_to_page(iommu_iova_to_phys(mapping->domain, iova));

	unsigned int offset = handle & ~PAGE_MASK;



	if (!iova)

		return;



	__dma_page_dev_to_cpu(page, offset, size, dir);

}
@@ -2150,9 +2144,6 @@ static void arm_iommu_sync_single_for_device(struct device *dev, 
	struct page *page = phys_to_page(iommu_iova_to_phys(mapping->domain, iova));

	unsigned int offset = handle & ~PAGE_MASK;



	if (!iova)

		return;



	__dma_page_cpu_to_dev(page, offset, size, dir);

}