linux-kernel - [PATCH 3.10 08/97] ARM: dma-mapping: fix GFP

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Message-Id: <20140304200346.382841545@linuxfoundation.org>
Date:	Tue,  4 Mar 2014 12:03:21 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Marek Szyprowski <m.szyprowski@...sung.com>
Subject: [PATCH 3.10 08/97] ARM: dma-mapping: fix GFP_ATOMIC macro usage

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

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

From: Marek Szyprowski <m.szyprowski@...sung.com>

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@...sung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 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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