From: Marek Szyprowski <m.szyprowski@samsung.com>
To: linux-kernel@vger.kernel.org, x86@kernel.org
Cc: Marek Szyprowski <m.szyprowski@samsung.com>,
        Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>,
        "H. Peter Anvin" <hpa@zytor.com>, stable@vger.kernel.org
Subject: [PATCH] x86: dma-mapping: fix GFP_ATOMIC macro usage
Date: Fri, 17 Jan 2014 09:46:38 +0100
Message-id: <1389948399-26344-1-git-send-email-m.szyprowski@samsung.com>
Sender: linux-kernel-owner@vger.kernel.org

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 v3.5-rc1

CC: stable@vger.kernel.org
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
---
 arch/x86/kernel/pci-dma.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c
index 872079a..32a81c9 100644
--- a/arch/x86/kernel/pci-dma.c
+++ b/arch/x86/kernel/pci-dma.c
@@ -100,7 +100,7 @@ void *dma_generic_alloc_coherent(struct device *dev, size_t size,
 	flag |= __GFP_ZERO;
 again:
 	page = NULL;
-	if (!(flag & GFP_ATOMIC))
+	if (flag & __GFP_WAIT)
 		page = dma_alloc_from_contiguous(dev, count, get_order(size));
 	if (!page)
 		page = alloc_pages_node(dev_to_node(dev), flag, get_order(size));
-- 
1.7.9.5

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