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

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Message-ID: <508ABE1D.5010106@gmail.com>
Date:	Fri, 26 Oct 2012 09:45:17 -0700
From:	David Daney <ddaney.cavm@...il.com>
To:	shuah.khan@...com
CC:	ralf@...ux-mips.org, kyungmin.park@...sung.com, arnd@...db.de,
	andrzej.p@...sung.com, m.szyprowski@...sung.com,
	linux-mips@...ux-mips.org, LKML <linux-kernel@...r.kernel.org>,
	shuahkhan@...il.com
Subject: Re: [PATCH RFT RESEND linux-next] mips: dma-mapping: support debug_dma_mapping_error

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 <shuah.khan@...com>
> ---
>   arch/mips/include/asm/dma-mapping.h |    2 ++
>   1 file changed, 2 insertions(+)
>
> diff --git a/arch/mips/include/asm/dma-mapping.h b/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_*().

Thanks,
David Daney
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