[PATCH v2] ata: dwc: add DMADEVICES dependency

[PATCH v2] ata: dwc: add DMADEVICES dependency

[Arnd Bergmann]

The dwc_460ex SATA driver has become available on non-powerpc architectures
and may cause randconfig build errors when CONFIG_DMADEVICES is not set
and SATA_DWC_OLD_DMA is enabled:

warning: (SATA_DWC_OLD_DMA) selects DW_DMAC_CORE which has unmet direct dependencies (DMADEVICES)
ERROR: "dw_dma_probe" [drivers/ata/sata_dwc_460ex.ko] undefined!
ERROR: "dw_dma_remove" [drivers/ata/sata_dwc_460ex.ko] undefined!

This adds an explcit Kconfig dependency to CONFIG_SATA_DWC so we
cannot run into broken configurations. While it would also be
possible to build the driver with both CONFIG_DMADEVICES
and SATA_DWC_OLD_DMA disabled, that case is not useful because
there is no fallback to PIO mode when the DMA engine is not
usable.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Fixes: 50b433753df6 ("ata: sata_dwc_460ex: use "dmas" DT property to find dma channel")
---
 drivers/ata/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
index 41b0725e58ad..e2dc4c045146 100644
--- a/drivers/ata/Kconfig
+++ b/drivers/ata/Kconfig
@@ -313,6 +313,7 @@ config ATA_PIIX
 
 config SATA_DWC
 	tristate "DesignWare Cores SATA support"
+	depends on DMADEVICES
 	select GENERIC_PHY
 	help
 	  This option enables support for the on-chip SATA controller of the
-- 
2.7.0

Re: [PATCH v2] ata: dwc: add DMADEVICES dependency

[Andy Shevchenko]

On Wed, May 11, 2016 at 4:42 PM, Arnd Bergmann <arnd@arndb.de> wrote:
> The dwc_460ex SATA driver has become available on non-powerpc architectures
> and may cause randconfig build errors when CONFIG_DMADEVICES is not set
> and SATA_DWC_OLD_DMA is enabled:
>
> warning: (SATA_DWC_OLD_DMA) selects DW_DMAC_CORE which has unmet direct dependencies (DMADEVICES)
> ERROR: "dw_dma_probe" [drivers/ata/sata_dwc_460ex.ko] undefined!
> ERROR: "dw_dma_remove" [drivers/ata/sata_dwc_460ex.ko] undefined!
>
> This adds an explcit Kconfig dependency to CONFIG_SATA_DWC so we
> cannot run into broken configurations. While it would also be
> possible to build the driver with both CONFIG_DMADEVICES
> and SATA_DWC_OLD_DMA disabled, that case is not useful because
> there is no fallback to PIO mode when the DMA engine is not
> usable.
>
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> Fixes: 50b433753df6 ("ata: sata_dwc_460ex: use "dmas" DT property to find dma channel")

Looks reasonable to me:
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>

> ---
>  drivers/ata/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
> index 41b0725e58ad..e2dc4c045146 100644
> --- a/drivers/ata/Kconfig
> +++ b/drivers/ata/Kconfig
> @@ -313,6 +313,7 @@ config ATA_PIIX
>
>  config SATA_DWC
>         tristate "DesignWare Cores SATA support"
> +       depends on DMADEVICES
>         select GENERIC_PHY
>         help
>           This option enables support for the on-chip SATA controller of the
> --
> 2.7.0
>



-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH v2] ata: dwc: add DMADEVICES dependency

[Tejun Heo]

On Wed, May 11, 2016 at 03:42:08PM +0200, Arnd Bergmann wrote:
> The dwc_460ex SATA driver has become available on non-powerpc architectures
> and may cause randconfig build errors when CONFIG_DMADEVICES is not set
> and SATA_DWC_OLD_DMA is enabled:
> 
> warning: (SATA_DWC_OLD_DMA) selects DW_DMAC_CORE which has unmet direct dependencies (DMADEVICES)
> ERROR: "dw_dma_probe" [drivers/ata/sata_dwc_460ex.ko] undefined!
> ERROR: "dw_dma_remove" [drivers/ata/sata_dwc_460ex.ko] undefined!
> 
> This adds an explcit Kconfig dependency to CONFIG_SATA_DWC so we
> cannot run into broken configurations. While it would also be
> possible to build the driver with both CONFIG_DMADEVICES
> and SATA_DWC_OLD_DMA disabled, that case is not useful because
> there is no fallback to PIO mode when the DMA engine is not
> usable.
> 
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> Fixes: 50b433753df6 ("ata: sata_dwc_460ex: use "dmas" DT property to find dma channel")

Applied to libata/for-4.7-dw.

Thanks.

-- 
tejun