linux-kernel - Re: sata_sil24 0000:04:00.0: DMA-API: device driver frees DMA sg list with different entry count [map count=13] [unmap count=10]

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Date:	Wed, 03 Jun 2009 17:33:21 -0600
From:	Robert Hancock <hancockrwd@...il.com>
To:	Kasper Sandberg <lkml@...anurb.dk>
CC:	Torsten Kaiser <just.for.lkml@...glemail.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	SCSI development list <linux-scsi@...r.kernel.org>
Subject: Re: sata_sil24 0000:04:00.0: DMA-API: device driver frees DMA sg
 list  with different entry count [map count=13] [unmap count=10]

Kasper Sandberg wrote:
> On Wed, 2009-06-03 at 21:30 +0200, Torsten Kaiser wrote:
>> On Wed, May 27, 2009 at 1:40 AM, Robert Hancock <hancockrwd@...il.com> wrote:
>>> Torsten Kaiser wrote:
>>>> On upgrading to 2.6.30-rc1 I enable the DMA-Debugging option
>>>> CONFIG_DMA_API_DEBUG=y
>>>> Since then I get the following or similar errors on each boot:
>>> Please retest with a newer -rc, this patch likely fixes it:
>>>
>>> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=5825627c9463581fd9e70f8285685889ae5bb9bb
>>>
>> Still happens with 2.6.30-rc8 (see trace at the end of the email)
>>
> <snip>
> 
> Does this actually give you any problems? should I be scared to give .30
> a test?

If Torsten's diagnosis is correct it's a problem with the DMA debugging 
code, not an actual driver bug.
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