linux-kernel - Re: dma-debug warning with ixgbe

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Message-ID: <20090617092629.GP5139@amd.com>
Date:	Wed, 17 Jun 2009 11:26:29 +0200
From:	Joerg Roedel <joerg.roedel@....com>
To:	"Brandeburg, Jesse" <jesse.brandeburg@...el.com>
CC:	"e1000-devel@...ts.sourceforge.net" 
	<e1000-devel@...ts.sourceforge.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: dma-debug warning with ixgbe

On Tue, Jun 16, 2009 at 09:33:15AM -0700, Brandeburg, Jesse wrote:
> On Tue, 16 Jun 2009, Joerg Roedel wrote:
> > today I got this dma-debug warning with the ixgbe driver with a kernel
> > near 2.6.30-rc8.
> 
> Hi Joerg, thanks for the report, I thought we had fixed all of these 
> already but we must have missed this one.
> 
> > ------------[ cut here ]------------
> > WARNING: at /data/repos/linux-2.6-iommu/lib/dma-debug.c:806
> > check_unmap+0x214/0x5c3()
> > Hardware name: Toonie
> > ixgbe 0000:02:00.0: DMA-API: device driver frees DMA memory with
> > different size [device address=0x0000000000045c12] [map size=258
> > bytes] [unmap size=256 bytes]
> 
> The following patch should fix it, compile tested only, but it is pretty 
> straight forward.

Thanks for the quick answer :) But I tested the patch and the warning is
still there.

	Joerg

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