linux-kernel - Re: [PATCH] scsi: advansys needs ISA dma api for ISA support

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Message-ID: <561F96B7.4050300@suse.de>
Date:	Thu, 15 Oct 2015 14:06:15 +0200
From:	Hannes Reinecke <hare@...e.de>
To:	Arnd Bergmann <arnd@...db.de>, linux-scsi@...r.kernel.org,
	JBottomley@...n.com
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] scsi: advansys needs ISA dma api for ISA support

On 10/12/2015 05:10 PM, Arnd Bergmann wrote:
> The advansys drvier uses the request_dma function that is used on ISA
> machines for the internal DMA controller, which causes build errors
> on platforms that have ISA slots but do not provide the ISA DMA API:
> 
> drivers/scsi/advansys.c: In function 'advansys_board_found':
> drivers/scsi/advansys.c:11300:10: error: implicit declaration of function 'request_dma' [-Werror=implicit-function-declaration]
> 
> The problem now showed up in ARM randconfig builds after commit
> 6571fb3f8b7f ("advansys: Update to version 3.5 and remove compilation
> warning") made it possible to build on platforms that have neither
> VIRT_TO_BUS nor ISA_DMA_API but that do have ISA.
> 
> This adds the missing dependency.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> 
> diff --git a/drivers/scsi/Kconfig b/drivers/scsi/Kconfig
> index d2f480b04a52..d4aa6a1a806c 100644
> --- a/drivers/scsi/Kconfig
> +++ b/drivers/scsi/Kconfig
> @@ -499,6 +499,7 @@ config SCSI_ADVANSYS
>  	tristate "AdvanSys SCSI support"
>  	depends on SCSI
>  	depends on ISA || EISA || PCI
> +	depends on ISA_DMA_API || !ISA
>  	help
>  	  This is a driver for all SCSI host adapters manufactured by
>  	  AdvanSys. It is documented in the kernel source in
> 
Sorry to chime in again, but wouldn't this allow to build on platforms
which have neither ISA_DMA_API nor ISA, like oldish sparc systems with
proprietary S-BUS?

Why not ISA_DMA_API || EISA || PCI ?

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		      zSeries & Storage
hare@...e.de			      +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: J. Hawn, J. Guild, F. Imendörffer, HRB 16746 (AG Nürnberg)
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