linux-kernel - Re: [PATCH v2] staging: comedi: labpc: fix isadma dependency

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Date:   Thu, 30 Mar 2017 10:02:23 +0100
From:   Ian Abbott <abbotti@....co.uk>
To:     Arnd Bergmann <arnd@...db.de>,
        H Hartley Sweeten <hsweeten@...ionengravers.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] staging: comedi: labpc: fix isadma dependency

On 29/03/17 22:10, Arnd Bergmann wrote:
> When COMEDI_NI_LABPC is built-in and COMEDI_NI_LABPC_ISA is a loadable
> module, thhe ISA DMA code is not reachable by the common module, causing
> a link error:
>
> drivers/staging/built-in.o: In function `labpc_interrupt':
> ni_labpc_common.c:(.text+0x1d178): undefined reference to `labpc_handle_dma_status'
> ni_labpc_common.c:(.text+0x1d1cb): undefined reference to `labpc_drain_dma'
> drivers/staging/built-in.o: In function `labpc_ai_cmd':
> ni_labpc_common.c:(.text+0x1d8ad): undefined reference to `labpc_setup_dma'
>
> This changes the definition of COMEDI_NI_LABPC_ISADMA so that it will
> also be builtin for that case. This looks like a rather old bug, but
> I have never seen this in randconfig testing until today.

That's because the comedi stuff has only recently been configurable as 
built-in.

>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  drivers/staging/comedi/Kconfig | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>
> v2: fix typo from first version, forgot to amend the patch after successfully
>     testing until I had sent it out.
>
> diff --git a/drivers/staging/comedi/Kconfig b/drivers/staging/comedi/Kconfig
> index 6079c23237d5..7a655ed071a3 100644
> --- a/drivers/staging/comedi/Kconfig
> +++ b/drivers/staging/comedi/Kconfig
> @@ -505,7 +505,6 @@ config COMEDI_NI_ATMIO16D
>  config COMEDI_NI_LABPC_ISA
>  	tristate "NI Lab-PC and compatibles ISA support"
>  	select COMEDI_NI_LABPC
> -	select COMEDI_NI_LABPC_ISADMA if ISA_DMA_API
>  	---help---
>  	  Enable support for National Instruments Lab-PC and compatibles
>  	  Lab-PC-1200, Lab-PC-1200AI, Lab-PC+.
> @@ -1315,6 +1314,9 @@ config COMEDI_NI_LABPC
>
>  config COMEDI_NI_LABPC_ISADMA
>  	tristate
> +	default COMEDI_NI_LABPC
> +	depends on COMEDI_NI_LABPC_ISA != n
> +	depends on ISA_DMA_API
>  	select COMEDI_ISADMA
>
>  config COMEDI_NI_TIO
>

Thanks for the fix!

Reviewed-by: Ian Abbott <abbotti@....co.uk>

-- 
-=( Ian Abbott @ MEV Ltd.    E-mail: <abbotti@....co.uk> )=-
-=(                          Web: http://www.mev.co.uk/  )=-