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authorThomas Bogendoerfer <tsbogend@alpha.franken.de>2008-11-29 13:46:27 +0100
committerIngo Molnar <mingo@elte.hu>2008-11-29 21:00:38 +0100
commit7b1dedca42ac0d0d0be01e39d8461bb53a2389b3 (patch)
tree2a2d2d37002a7614ceff8065fb362c4a820f5a1c /arch
parentb627c8b17ccacba38c975bc0f69a49fc4e5261c9 (diff)
downloadop-kernel-dev-7b1dedca42ac0d0d0be01e39d8461bb53a2389b3.zip
op-kernel-dev-7b1dedca42ac0d0d0be01e39d8461bb53a2389b3.tar.gz
x86: fix dma_mapping_error for 32bit x86
Devices like b44 ethernet can't dma from addresses above 1GB. The driver handles this cases by falling back to GFP_DMA allocation. But for detecting the problem it needs to get an indication from dma_mapping_error. The bug is triggered by using a VMSPLIT option of 2G/2G. Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Acked-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/include/asm/dma-mapping.h6
1 files changed, 2 insertions, 4 deletions
diff --git a/arch/x86/include/asm/dma-mapping.h b/arch/x86/include/asm/dma-mapping.h
index 7f225a4..097794f 100644
--- a/arch/x86/include/asm/dma-mapping.h
+++ b/arch/x86/include/asm/dma-mapping.h
@@ -71,15 +71,13 @@ static inline struct dma_mapping_ops *get_dma_ops(struct device *dev)
/* Make sure we keep the same behaviour */
static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
{
-#ifdef CONFIG_X86_32
- return 0;
-#else
+#ifdef CONFIG_X86_64
struct dma_mapping_ops *ops = get_dma_ops(dev);
if (ops->mapping_error)
return ops->mapping_error(dev, dma_addr);
- return (dma_addr == bad_dma_address);
#endif
+ return (dma_addr == bad_dma_address);
}
#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
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