dmaengine: shdma: fix a build failure on platforms with no DMA support

From: Guennadi Liakhovetski <[email protected]>

On platforms with no support for the shdma dmaengine driver build is currently failing with

drivers/built-in.o: In function `sh_mobile_sdhi_probe':
drivers/mmc/host/sh_mobile_sdhi.c:170: undefined reference to`shdma_chan_filter'

Fix the breakage by defining shdma_chan_filter to NULL in such configurations.

---
 include/linux/shdma-base.h | 4 ++++
 1 file changed, 4 insertions(+)

Hi Vinod,

please consider this fix from Guennadi for v3.11 which I have rebased on top of next-20130709. It fixes a build problem on a number of shmobile defconfigs including bockw.

Alternatively, I would be happy to take this through the renesas tree.

I posted this patch last week but I'm wondering if you missed it somehow. This patch resolves a regression in v3.11-rc1.

index 382cf71..5b1c984 100644
@@ -124,6 +124,10 @@ void shdma_chan_remove(struct shdma_chan *schan);
 int shdma_init(struct device *dev, struct shdma_dev *sdev,
 		    int chan_num);
 void shdma_cleanup(struct shdma_dev *sdev);
+#if IS_ENABLED(CONFIG_SH_DMAE_BASE)
 bool shdma_chan_filter(struct dma_chan *chan, void *arg);
+#else
+#define shdma_chan_filter NULL
+#endif
 
 #endif

1.8.2.1

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As mentioned on the other thread, I have applied this in the arm-soc fixes branch for 3.11 now.

-Olof