linux-kernel - Re: [PATCH v2] ata: dwc: add DMADEVICES dependency

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Date:	Thu, 12 May 2016 12:04:57 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Mans Rullgard <mans@...sr.com>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] ata: dwc: add DMADEVICES dependency

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@...db.de>
> Fixes: 50b433753df6 ("ata: sata_dwc_460ex: use "dmas" DT property to find dma channel")

Applied to libata/for-4.7-dw.

Thanks.

-- 
tejun