linux-kernel - Re: [PATCH] can: CAN_MCP251X should depend on HAS

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Message-ID: <4B2552C8.4090105@grandegger.com>
Date:	Sun, 13 Dec 2009 21:47:04 +0100
From:	Wolfgang Grandegger <wg@...ndegger.com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
CC:	Christian Pellegrin <chripell@...e.org>,
	"David S. Miller" <davem@...emloft.net>,
	Urs Thuermann <urs.thuermann@...kswagen.de>,
	Oliver Hartkopp <oliver.hartkopp@...kswagen.de>,
	netdev@...r.kernel.org,
	Linux Kernel Development <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] can: CAN_MCP251X should depend on HAS_DMA

Geert Uytterhoeven wrote:
> When building for Sun 3:
> 
> drivers/net/can/mcp251x.c:1074: undefined reference to `dma_free_coherent'
> drivers/net/can/mcp251x.c:976: undefined reference to `dma_alloc_coherent'
> drivers/net/can/mcp251x.c:1050: undefined reference to `dma_free_coherent'
> 
> Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
> ---
>  drivers/net/can/Kconfig |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/net/can/Kconfig b/drivers/net/can/Kconfig
> index 8c485aa..05b7517 100644
> --- a/drivers/net/can/Kconfig
> +++ b/drivers/net/can/Kconfig
> @@ -50,7 +50,7 @@ config CAN_TI_HECC
>  
>  config CAN_MCP251X
>  	tristate "Microchip MCP251x SPI CAN controllers"
> -	depends on CAN_DEV && SPI
> +	depends on CAN_DEV && SPI && HAS_DMA
>  	---help---
>  	  Driver for the Microchip MCP251x SPI CAN controllers.
>  

DMA can be selected with the module parameter "mcp251x_enable_dma" and
is *off* by default. Therefore the driver does in principle not depend
on HAS_DMA but I'm not sure if it's worth to handle it with #idef's.
Christian? Any thought?

Wolfgang.

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