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| author | Marek Szyprowski <m.szyprowski@samsung.com> | 2014-01-24 14:49:58 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-03-06 21:30:08 -0800 |
| commit | a9710605da39d67a58ff172b530125d9093d3160 (patch) | |
| tree | 9ff7aeabc64eada3acb6b7d03b86c48f8fcb9ebc | |
| parent | aa5b8c451354afccde1a54326b79e59aa648edf4 (diff) | |
| download | lwn-a9710605da39d67a58ff172b530125d9093d3160.tar.gz lwn-a9710605da39d67a58ff172b530125d9093d3160.zip | |
x86: dma-mapping: fix GFP_ATOMIC macro usage
commit c091c71ad2218fc50a07b3d1dab85783f3b77efd upstream.
GFP_ATOMIC is not a single gfp flag, but a macro which expands to the other
flags, where meaningful is the LACK of __GFP_WAIT flag. To check if caller
wants to perform an atomic allocation, the code must test for a lack of the
__GFP_WAIT flag. This patch fixes the issue introduced in v3.5-rc1.
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | arch/x86/kernel/pci-dma.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c index 872079a67e4d..f7d0672481fd 100644 --- a/arch/x86/kernel/pci-dma.c +++ b/arch/x86/kernel/pci-dma.c @@ -100,8 +100,10 @@ void *dma_generic_alloc_coherent(struct device *dev, size_t size, flag |= __GFP_ZERO; again: page = NULL; - if (!(flag & GFP_ATOMIC)) + /* CMA can be used only in the context which permits sleeping */ + if (flag & __GFP_WAIT) page = dma_alloc_from_contiguous(dev, count, get_order(size)); + /* fallback */ if (!page) page = alloc_pages_node(dev_to_node(dev), flag, get_order(size)); if (!page) |