linux-kernel - Re: [PATCH 0/16] DMA-API debugging facility v2

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Message-ID: <20090109223747.GE9466@8bytes.org>
Date:	Fri, 9 Jan 2009 23:37:47 +0100
From:	Joerg Roedel <joro@...tes.org>
To:	Michael Chan <mchan@...adcom.com>
Cc:	"iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH 0/16] DMA-API debugging facility v2

On Fri, Jan 09, 2009 at 11:33:27PM +0100, Joerg Roedel wrote:
> > This was triggered during pci_unmap_page() -> dma_unmap_single() where
> > check_unmap() did not find the entry.
> > 
> > The original mapping was done in bnx2 using pci_map_page().  I did not
> > see how the debug entry was added to the hash during the call to
> > pci_map_page() -> dma_map_page().  Did I miss something?
> 
> dma_map_page() results in dma_map_single() -> debug_map_single() call on
> x86. This way the entry would be added. Maybe the error from a double
> free?

Ah, it only calls ops->map_single. Thanks for pointing that out. I will
add a call to debug_map_single to dma_map_page too. So the error above
may be a false positive.

Joerg
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