linux-kernel - Re: [PATCH RFT linux-next] frv: dma-mapping: support debug_dma_mapping

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Date:	Fri, 26 Oct 2012 11:15:17 -0600
From:	Shuah Khan <shuah.khan@...com>
To:	dhowells@...hat.com
Cc:	LKML <linux-kernel@...r.kernel.org>, shuahkhan@...il.com
Subject: Re: [PATCH RFT linux-next] frv: dma-mapping: support
 debug_dma_mapping_error

On Fri, 2012-10-26 at 10:48 -0600, 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 <shuah.khan@...com>

Please ignore this patch if frv doesn't use dma_map_page() and
dma_map_single() from arch/mips/include/asm/dma-mapping.

frv defines dma_map_page() and dma_map_single() in
arch/frv/mb93090-mb00/pci-dma.c and
arch/frv/mb93090-mb00/pci-dma-nommu.c

-- Shuah
> ---
>  arch/frv/include/asm/dma-mapping.h |    2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/arch/frv/include/asm/dma-mapping.h b/arch/frv/include/asm/dma-mapping.h
> index dfb8110..d8a8aac 100644
> --- a/arch/frv/include/asm/dma-mapping.h
> +++ b/arch/frv/include/asm/dma-mapping.h
> @@ -6,6 +6,7 @@
>  #include <asm/cacheflush.h>
>  #include <asm/scatterlist.h>
>  #include <asm/io.h>
> +#include <linux/dma-debug.h>
>  
>  /*
>   * See Documentation/DMA-API.txt for the description of how the
> @@ -97,6 +98,7 @@ void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nele
>  static inline
>  int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
>  {
> +	debug_dma_mapping_error(dev, dma_addr);
>  	return 0;
>  }
>  


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