[PATCH 3/5] x86: fix nommu_alloc_coherent allocation with NULL device argument

[FUJITA Tomonori]

We need to use __GFP_DMA for NULL device argument (fallback_dev) with
pci-nommu. It's a hack for ISA (and some old code) so we need to use
GFP_DMA.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@xxxxxxxxxxxxx>
---
 arch/x86/kernel/pci-nommu.c   |    3 +--
 include/asm-x86/dma-mapping.h |    2 ++
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/pci-nommu.c b/arch/x86/kernel/pci-nommu.c
index 0f51883..ada1c87 100644
--- a/arch/x86/kernel/pci-nommu.c
+++ b/arch/x86/kernel/pci-nommu.c
@@ -80,7 +80,6 @@ nommu_alloc_coherent(struct device *hwdev, size_t size,
 	int node;
 	struct page *page;
 
-	gfp &= ~(__GFP_DMA | __GFP_HIGHMEM | __GFP_DMA32);
 	gfp |= __GFP_ZERO;
 
 	dma_mask = hwdev->coherent_dma_mask;
@@ -93,7 +92,7 @@ nommu_alloc_coherent(struct device *hwdev, size_t size,
 	node = dev_to_node(hwdev);
 
 #ifdef CONFIG_X86_64
-	if (dma_mask <= DMA_32BIT_MASK)
+	if (dma_mask <= DMA_32BIT_MASK && !(gfp & GFP_DMA))
 		gfp |= GFP_DMA32;
 #endif
 
diff --git a/include/asm-x86/dma-mapping.h b/include/asm-x86/dma-mapping.h
index 39d3641..9d6dcf4 100644
--- a/include/asm-x86/dma-mapping.h
+++ b/include/asm-x86/dma-mapping.h
@@ -248,6 +248,8 @@ dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
 	struct dma_mapping_ops *ops = get_dma_ops(dev);
 	void *memory;
 
+	gfp &= ~(__GFP_DMA | __GFP_HIGHMEM | __GFP_DMA32);
+
 	if (dma_alloc_from_coherent(dev, size, dma_handle, &memory))
 		return memory;
 
-- 
1.5.5.GIT

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