From eb7038b13a86336a575ea2043329eb7472e5d978 Mon Sep 17 00:00:00 2001 From: Robin Murphy Date: Sun, 30 Apr 2017 09:56:16 -0700 Subject: iommu/dma: Remove bogus dma_supported() implementation Back when this was first written, dma_supported() was somewhat of a murky mess, with subtly different interpretations being relied upon in various places. The "does device X support DMA to address range Y?" uses assuming Y to be physical addresses, which motivated the current iommu_dma_supported() implementation and are alluded to in the comment therein, have since been cleaned up, leaving only the far less ambiguous "can device X drive address bits Y" usage internal to DMA API mask setting. As such, there is no reason to keep a slightly misleading callback which does nothing but duplicate the current default behaviour; we already constrain IOVA allocations to the iommu_domain aperture where necessary, so let's leave DMA mask business to architecture-specific code where it belongs. Signed-off-by: Robin Murphy Signed-off-by: Joerg Roedel Git-commit: a1831bb9403720db6d4c033fe2d6bd0116dd28fe Git-repo:git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git CRs-Fixed: 2040683 Change-Id: I67431608ce196bf5ca981fb9aea2afce826094f0 Signed-off-by: Atul Raut --- include/linux/dma-iommu.h | 1 - 1 file changed, 1 deletion(-) (limited to 'include/linux') diff --git a/include/linux/dma-iommu.h b/include/linux/dma-iommu.h index fc481037478a..f3422440c45f 100644 --- a/include/linux/dma-iommu.h +++ b/include/linux/dma-iommu.h @@ -59,7 +59,6 @@ void iommu_dma_unmap_page(struct device *dev, dma_addr_t handle, size_t size, enum dma_data_direction dir, struct dma_attrs *attrs); void iommu_dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nents, enum dma_data_direction dir, struct dma_attrs *attrs); -int iommu_dma_supported(struct device *dev, u64 mask); int iommu_dma_mapping_error(struct device *dev, dma_addr_t dma_addr); #else -- cgit v1.2.3