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

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Date:	Wed, 11 May 2016 15:42:08 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Tejun Heo <tj@...nel.org>
Cc:	Arnd Bergmann <arnd@...db.de>, Mans Rullgard <mans@...sr.com>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2] ata: dwc: add DMADEVICES dependency

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")
---
 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