[RFC 3/4] ARM: dma-mapping: Return cpu addr when dma_alloc(GFP_ATOMIC)
From: Hiroshi Doyu <hidden>
Date: 2012-08-22 10:21:23
Also in:
linux-arm-kernel, lkml
Subsystem:
arm port, the rest · Maintainers:
Russell King, Linus Torvalds
Make dma_alloc{_attrs}() returns cpu address when
DMA_ATTR_NO_KERNEL_MAPPING && GFP_ATOMIC.
Signed-off-by: Hiroshi Doyu <redacted>
---
arch/arm/mm/dma-mapping.c | 5 ++++-
1 files changed, 4 insertions(+), 1 deletions(-)
diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index 9260107..a0cd476 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c@@ -1198,8 +1198,11 @@ static void *arm_iommu_alloc_attrs(struct device *dev, size_t size, if (*handle == DMA_ERROR_CODE) goto err_buffer; - if (dma_get_attr(DMA_ATTR_NO_KERNEL_MAPPING, attrs)) + if (dma_get_attr(DMA_ATTR_NO_KERNEL_MAPPING, attrs)) { + if (gfp & GFP_ATOMIC) + return page_address(pages[0]); return pages; + } addr = __iommu_alloc_remap(pages, size, gfp, prot, __builtin_return_address(0));
--
1.7.5.4
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