[PATCH 01/12] dmaengine: Make dma_get_slave_channel() public

[Koichiro Den]

Commit c3c431de99c06 ("dmaengine: Move dma_get_{,any_}slave_channel() to
private dmaengine.h") moved dma_get_slave_channel() to the private DMA
engine header because only DMA engine drivers used it at the time.

PCI endpoint DMA needs to reserve an exact channel from outside
drivers/dma. Restore dma_get_slave_channel() to the public header for
that use case while keeping dma_get_any_slave_channel() private.

Signed-off-by: Koichiro Den <den@xxxxxxxxxxxxx>
---
 drivers/dma/dmaengine.h   | 1 -
 include/linux/dmaengine.h | 6 ++++++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/dma/dmaengine.h b/drivers/dma/dmaengine.h
index 53f16d3f0029..bde5217ce2b5 100644
--- a/drivers/dma/dmaengine.h
+++ b/drivers/dma/dmaengine.h
@@ -179,7 +179,6 @@ dmaengine_desc_callback_valid(struct dmaengine_desc_callback *cb)
 	return cb->callback || cb->callback_result;
 }
 
-struct dma_chan *dma_get_slave_channel(struct dma_chan *chan);
 struct dma_chan *dma_get_any_slave_channel(struct dma_device *device);
 
 #ifdef CONFIG_DEBUG_FS
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index b3d251c9734e..59be52e74d5e 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -1527,6 +1527,7 @@ struct dma_chan *dma_request_chan(struct device *dev, const char *name);
 struct dma_chan *dma_request_chan_by_mask(const dma_cap_mask_t *mask);
 struct dma_chan *devm_dma_request_chan(struct device *dev, const char *name);
 
+struct dma_chan *dma_get_slave_channel(struct dma_chan *chan);
 void dma_release_channel(struct dma_chan *chan);
 int dma_get_slave_caps(struct dma_chan *chan, struct dma_slave_caps *caps);
 #else
@@ -1568,6 +1569,11 @@ static inline struct dma_chan *devm_dma_request_chan(struct device *dev, const c
 	return ERR_PTR(-ENODEV);
 }
 
+static inline struct dma_chan *dma_get_slave_channel(struct dma_chan *chan)
+{
+	return NULL;
+}
+
 static inline void dma_release_channel(struct dma_chan *chan)
 {
 }
-- 
2.51.0