On Mon, 2015-10-12 at 17:10 +0200, 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@xxxxxxxx>
>
> 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
This fix looks wrong. the request_dma code is confined within an #ifdef
CONFIG_ISA section but the advansys doesn't actually require an ISA DMA
channel to function, so you're saying there are systems with ISA but
without request_dma()?
If so I think we leave the depends alone and try to bring the board up
in NO_ISA_DMA mode. That means the narrowboard check should be gated by
CONFIG_ISA_DMA_API ... do we also have to gate free_dma as well?
James
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