linux-kernel - Re: [PATCH 12/12] staging: COMEDI should depend on HAS

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Date:	Fri, 10 May 2013 13:07:42 +0100
From:	Ian Abbott <abbotti@....co.uk>
To:	Ian Abbott <ian.abbott@....co.uk>
CC:	H Hartley Sweeten <hartleys@...ionengravers.com>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH 12/12] staging: COMEDI should depend on HAS_DMA

On 2013-05-10 11:02, Ian Abbott wrote:
> On 2013-05-09 22:33, H Hartley Sweeten wrote:
>> On Thursday, May 09, 2013 2:05 PM, Geert Uytterhoeven wrote:
>>> If NO_DMA=y:
>>>
>>> ERROR: "dma_free_coherent" [drivers/staging/comedi/comedi.ko] undefined!
>>> ERROR: "dma_alloc_coherent" [drivers/staging/comedi/comedi.ko] undefined!
>>>
>>> Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
>>> Cc: Ian Abbott <abbotti@....co.uk>
>>> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
>>> Cc: devel@...verdev.osuosl.org
>>
>> Grr..
>>
>> The error appears to be caused by the dma alloc/free in comedi_buf.c.
>> These only happen if the (s->async_dma_dir != DMA_NONE). The comedi
>> core defaults the async_dma_dir to DMA_NONE. The only comedi drivers
>> that set it are ni_660x, ni_mio_common, and ni_pcidio.
>>
>> The mite driver also has a dma_alloc/free.
>>
>> Ian, can you think of a better solution than just making comedi depend on HAS_DMA?
>
> The only alternative I can think of is to change comedi_buf.c to only
> compile in the functions if CONFIG_HAS_DMA is defined and to make the
> following config options depend on HAS_DMA:
>
> COMEDI_NI_6527
> COMEDI_NI_65XX
> COMEDI_NI_660X
> COMEDI_NI_670X
> COMEDI_NI_LABPC_PCI
> COMEDI_NI_PCIDIO
> COMEDI_NI_PCIMIO
> COMEDI_MITE
> COMEDI_NI_TIOCMD

I'm working on it.

-- 
-=( Ian Abbott @ MEV Ltd.    E-mail: <abbotti@....co.uk>        )=-
-=( Tel: +44 (0)161 477 1898   FAX: +44 (0)161 718 3587         )=-
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