[PATCH 3.10 08/97] ARM: dma-mapping: fix GFP_ATOMIC macro usage

From: Greg Kroah-Hartman
Date: Tue Mar 04 2014 - 15:37:00 EST


3.10-stable review patch. If anyone has any objections, please let me know.

------------------

From: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>

commit 10c8562f932d89c030083e15f9279971ed637136 upstream.

GFP_ATOMIC is not a single gfp flag, but a macro which expands to the other
flags and LACK of __GFP_WAIT flag. To check if caller wanted to perform an
atomic allocation, the code must test __GFP_WAIT flag presence. This patch
fixes the issue introduced in v3.6-rc5

Signed-off-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
arch/arm/mm/dma-mapping.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -1311,7 +1311,7 @@ static void *arm_iommu_alloc_attrs(struc
*handle = DMA_ERROR_CODE;
size = PAGE_ALIGN(size);

- if (gfp & GFP_ATOMIC)
+ if (!(gfp & __GFP_WAIT))
return __iommu_alloc_atomic(dev, size, handle);

pages = __iommu_alloc_buffer(dev, size, gfp, attrs);


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