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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Message-ID: <64bb37e0905261911v1b80456ckbc7b7c7858d4b28a@mail.gmail.com>
Date:	Wed, 27 May 2009 04:11:56 +0200
From:	Torsten Kaiser <just.for.lkml@...glemail.com>
To:	Robert Hancock <hancockrwd@...il.com>
Cc:	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]

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
>

I saw this with 2.6.30-rc1 the first time, but I'm not sure if it
broke during the merge window or if it was always broken, because I
did not have enable DMA_API_DEBUG with earlier kernels.

But I'm seeing it with all -rc since then. The traces I posted were
from -rc6 and -rc7.

Torsten
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