linux-kernel - Re: [PATCH 05/10] x86: add check code for map/unmap

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Message-Id: <20081122120632M.fujita.tomonori@lab.ntt.co.jp>
Date:	Sat, 22 Nov 2008 12:27:41 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	joerg.roedel@....com
Cc:	mingo@...hat.com, tglx@...utronix.de, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, iommu@...ts.linux-foundation.org
Subject: Re: [PATCH 05/10] x86: add check code for map/unmap_single code

On Fri, 21 Nov 2008 17:26:05 +0100
Joerg Roedel <joerg.roedel@....com> wrote:

> Impact: detect bugs in map/unmap_single usage
> 
> Signed-off-by: Joerg Roedel <joerg.roedel@....com>
> ---
>  arch/x86/include/asm/dma-mapping.h |    9 +++++-
>  arch/x86/include/asm/dma_debug.h   |   20 +++++++++++++
>  arch/x86/kernel/pci-dma-debug.c    |   55 ++++++++++++++++++++++++++++++++++++
>  3 files changed, 83 insertions(+), 1 deletions(-)
> 
> diff --git a/arch/x86/include/asm/dma-mapping.h b/arch/x86/include/asm/dma-mapping.h
> index 83d7b7d..c9bead2 100644
> --- a/arch/x86/include/asm/dma-mapping.h
> +++ b/arch/x86/include/asm/dma-mapping.h
> @@ -98,9 +98,14 @@ dma_map_single(struct device *hwdev, void *ptr, size_t size,
>  	       int direction)
>  {
>  	struct dma_mapping_ops *ops = get_dma_ops(hwdev);
> +	dma_addr_t addr;
>  
>  	BUG_ON(!valid_dma_direction(direction));
> -	return ops->map_single(hwdev, virt_to_phys(ptr), size, direction);
> +	addr = ops->map_single(hwdev, virt_to_phys(ptr), size, direction);
> +
> +	debug_map_single(hwdev, ptr, size, direction, addr);

debug_map_single could fail due to OOM. Then debug_unmap_single in
dma_unmap_single gives a false warning because it can't find the
dma_debug_entry?

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