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

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Date:	Wed, 27 Mar 2013 10:18:17 -0600
From:	Shuah Khan <shuah.khan@...com>
To:	Marek Szyprowski <m.szyprowski@...sung.com>
Cc:	Michael Cree <mcree@...on.net.nz>, rth@...ddle.net,
	ink@...assic.park.msu.ru, mattst88@...il.com,
	kyungmin.park@...sung.com, arnd@...db.de, andrzej.p@...sung.com,
	linux-alpha@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	Shuah Khan <shuah.khan@...com>
Subject: Re: [PATCH RFT linux-next] alpha: dma-mapping: support
 debug_dma_mapping_error

On Wed, 2013-03-27 at 16:45 +0100, Marek Szyprowski wrote:
> Hello,
> 
> On 3/27/2013 7:59 AM, Michael Cree wrote:
> > On Thu, Nov 15, 2012 at 10:49:28AM -0700, Shuah Khan wrote:
> > > On Fri, 2012-10-26 at 10:32 -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>
> > > > ---
> > > >  arch/alpha/include/asm/dma-mapping.h |    1 +
> > > >  1 file changed, 1 insertion(+)
> > > >
> > > > diff --git a/arch/alpha/include/asm/dma-mapping.h b/arch/alpha/include/asm/dma-mapping.h
> > > > index dfa32f0..b4d483b 100644
> > > > --- a/arch/alpha/include/asm/dma-mapping.h
> > > > +++ b/arch/alpha/include/asm/dma-mapping.h
> > > > @@ -32,6 +32,7 @@ static inline void dma_free_attrs(struct device *dev, size_t size,
> > > >
> > > >  static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
> > > >  {
> > > > +	debug_dma_mapping_error(dev, dma_addr);
> > > >  	return get_dma_ops(dev)->mapping_error(dev, dma_addr);
> > > >  }
> > > >
> > >
> > > Marek,
> > >
> > > This is for alpha to go through your tree.
> >
> > Given that this does not appear to be upstream yet I'll take it through
> > the Alpha tree.
> 
> Those patches in the end went via IOMMU tree. I looks that the patch for 
> Alpha has
> been missed. It looks that this patch should be merged to v3.9-rcX asap 
> to fix the
> broken dma-mapping api calls.
> 

The reason it didn't get pulled into iommu tree was that alpha Kconfig
doesn't support HAVE_DMA_API_DEBUG and DMA_API_DEBUG. I don't see it in
arch/alpha/Kconfig. That said, this patch is needed on alpha, if these
two config options get enabled. I will leave it up to the alpha
maintainers to decide if this patch is needed or not.

thanks,
-- Shuah


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