linux-kernel - Re: [PATCH 08/16] dma-debug: add core checking functions

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Message-Id: <1233868079.3548.699.camel@macbook.infradead.org>
Date:	Thu, 05 Feb 2009 21:07:59 +0000
From:	David Woodhouse <dwmw2@...radead.org>
To:	Joerg Roedel <joerg.roedel@....com>
Cc:	mingo@...hat.com, linux-kernel@...r.kernel.org,
	fujita.tomonori@....ntt.co.jp, iommu@...ts.linux-foundation.org,
	davem@...emloft.net
Subject: Re: [PATCH 08/16] dma-debug: add core checking functions

On Mon, 2009-01-19 at 15:46 +0100, Joerg Roedel wrote:
>  
> +       if (ref->type != entry->type) {
> +               err_printk(ref->dev, "DMA-API: device driver frees "
> +                          "DMA memory with wrong function "
> +                          "[device address=0x%016llx] [size=%llu bytes] "
> +                          "[mapped as %s] [unmapped as %s]\n",
> +                          ref->dev_addr, ref->size,
> +                          type2name[entry->type], type2name[ref->type]);

e1000e 0000:00:19.0: DMA-API: device driver frees DMA memory with wrong
function [device address=0x00000000ffedc002] [size=90 bytes] [mapped as
single] [unmapped as page]


<davem> That debug check is excessive, substituting those two things
works for every DMA API implementation I am aware of

-- 
David Woodhouse                            Open Source Technology Centre
David.Woodhouse@...el.com                              Intel Corporation

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