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Re: [PATCH RFT RESEND linux-next] mips: dma-mapping: support debug_dma_m

Subject: Re: [PATCH RFT RESEND linux-next] mips: dma-mapping: support debug_dma_mapping_error
From: David Daney <>
Date: Fri, 26 Oct 2012 09:45:17 -0700
Cc:,,,,,, LKML <>,
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On 10/26/2012 09:01 AM, Shuah Khan wrote:
Add support for debug_dma_mapping_error() call to avoid warning from
debug_dma_unmap() interface when it checks for mapping error checked
status. Without this patch, device driver failed to check map error
warning is generated.

Signed-off-by: Shuah Khan <>
  arch/mips/include/asm/dma-mapping.h |    2 ++
  1 file changed, 2 insertions(+)

diff --git a/arch/mips/include/asm/dma-mapping.h 
index be39a12..006b43e 100644
--- a/arch/mips/include/asm/dma-mapping.h
+++ b/arch/mips/include/asm/dma-mapping.h
@@ -40,6 +40,8 @@ static inline int dma_supported(struct device *dev, u64 mask)
  static inline int dma_mapping_error(struct device *dev, u64 mask)
        struct dma_map_ops *ops = get_dma_ops(dev);
+       debug_dma_mapping_error(dev, mask);
        return ops->mapping_error(dev, mask);

Although this is a start, I don't think it is sufficient.

As far as I can tell, there are many missing calls to debug_dma_*() in the various MIPS commone and sub-architecture DMA code.

Really you (or someone) needs to look at *all* the functions in arch/mips/asm/dma-mapping.h, and arch/mips/mm/dma-default.c and find places missing a debug_dma_*().

David Daney

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