linux-kernel - Re: debug_dma_assert_idle - snd_hda_intel - cpu touching an active dma mapped cacheline

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Message-ID: <53500CDB.8050802@gmail.com>
Date:	Thu, 17 Apr 2014 19:18:19 +0200
From:	poma <pomidorabelisima@...il.com>
To:	Clemens Ladisch <clemens@...isch.de>, Takashi Iwai <tiwai@...e.de>
CC:	Linux Kernel list <linux-kernel@...r.kernel.org>,
	Mailing-List fedora-kernel <kernel@...ts.fedoraproject.org>
Subject: Re: debug_dma_assert_idle - snd_hda_intel - cpu touching an active
 dma mapped cacheline

On 17.04.2014 09:40, Clemens Ladisch wrote:
> poma wrote:
>> Sound whispers,
> 
> ???
> 
>>  WARNING: CPU: 3 PID: 900 at lib/dma-debug.c:593 debug_dma_assert_idle+0x159/0x1d0()
>>  snd_hda_intel 0000:00:07.0: DMA-API: cpu touching an active dma mapped cacheline [cln=0x03014000]
>>  ...
>>  Mapped at:
>>   [<c074ec12>] debug_dma_alloc_coherent+0x22/0x70
> 
> "Coherent" means "touching DMA mappings is allowed".
> Why does dma-debug complain about that?
> 
> 
> Regards,
> Clemens
> 

Thanks for comment.
Waiting for rc2 to be sure!


poma


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