linux-kernel - Re: [PATCH 11/16] dma-debug: add checking for [alloc|free]

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Date:	Sun, 11 Jan 2009 15:30:14 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	fujita.tomonori@....ntt.co.jp
Cc:	joerg.roedel@....com, linux-kernel@...r.kernel.org,
	mingo@...hat.com, dwmw2@...radead.org, netdev@...r.kernel.org,
	iommu@...ts.linux-foundation.org
Subject: Re: [PATCH 11/16] dma-debug: add checking for [alloc|free]_coherent

On Sun, 11 Jan 2009 15:25:42 +0900
FUJITA Tomonori <fujita.tomonori@....ntt.co.jp> wrote:

> On Fri, 9 Jan 2009 17:19:25 +0100
> Joerg Roedel <joerg.roedel@....com> wrote:
> 
> > Impact: add debug callbacks for dma_[alloc|free]_coherent
> > 
> > Signed-off-by: Joerg Roedel <joerg.roedel@....com>
> > ---
> >  include/linux/dma-debug.h |   16 ++++++++++++++++
> >  lib/dma-debug.c           |   45 +++++++++++++++++++++++++++++++++++++++++++++
> >  2 files changed, 61 insertions(+), 0 deletions(-)
> > 
> > diff --git a/include/linux/dma-debug.h b/include/linux/dma-debug.h
> > index b2131f4..a28a701 100644
> > --- a/include/linux/dma-debug.h
> > +++ b/include/linux/dma-debug.h
> > @@ -40,6 +40,12 @@ extern void debug_map_sg(struct device *dev, struct scatterlist *sg,
> >  extern void debug_unmap_sg(struct device *dev, struct scatterlist *sglist,
> >  			   int nelems, int dir);
> >  
> > +extern void debug_alloc_coherent(struct device *dev, size_t size,
> > +				 dma_addr_t dma_addr, void *virt);
> > +
> > +extern void debug_free_coherent(struct device *dev, size_t size,
> > +				void *virt, dma_addr_t addr);
> > +
> >  #else /* CONFIG_DMA_API_DEBUG */
> >  
> >  static inline void dma_debug_init(u32 num_entries)
> > @@ -68,6 +74,16 @@ static inline void debug_unmap_sg(struct device *dev,
> >  {
> >  }
> >  
> > +static inline void debug_alloc_coherent(struct device *dev, size_t size,
> > +					dma_addr_t dma_addr, void *virt)
> > +{
> > +}
> > +
> > +static inline void debug_free_coherent(struct device *dev, size_t size,
> > +				       void *virt, dma_addr_t addr)
> > +{
> > +}
> > +
> >  #endif /* CONFIG_DMA_API_DEBUG */
> >  
> >  #endif /* __DMA_DEBUG_H */
> > diff --git a/lib/dma-debug.c b/lib/dma-debug.c
> > index e6d45f9..a4a5b0f 100644
> > --- a/lib/dma-debug.c
> > +++ b/lib/dma-debug.c
> > @@ -604,3 +604,48 @@ void debug_unmap_sg(struct device *dev, struct scatterlist *sglist,
> >  }
> >  EXPORT_SYMBOL(debug_unmap_sg);
> >  
> > +void debug_alloc_coherent(struct device *dev, size_t size,
> > +			  dma_addr_t dma_addr, void *virt)
> > +{
> > +	struct dma_debug_entry *entry;
> > +
> > +	if (global_disable)
> > +		return;
> > +
> > +	if (dma_addr == bad_dma_address)
> > +		return;
> 
> Only X86 has 'bad_dma_address' (IA64 also has with some configurations
> though). You need to use dma_mapping_error, as I pointed out in the
> previous submission.

Oops, this is for dma_alloc_coherent so you need to check 'virt'
instead of dma_mapping_error().
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