dmaengine: fix is_slave_direction() return false when DMA_DEV_TO_DEV

[ Upstream commit a22fe1d ]

is_slave_direction() should return true when direction is DMA_DEV_TO_DEV.

Fixes: 49920bc ("dmaengine: add new enum dma_transfer_direction")
Signed-off-by: Frank Li <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Vinod Koul <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>

Author: nxpfrankli

include/linux/dmaengine.h

@@ -955,7 +955,8 @@ static inline int dmaengine_slave_config(struct dma_chan *chan,
 
 static inline bool is_slave_direction(enum dma_transfer_direction direction)
 {
-	return (direction == DMA_MEM_TO_DEV) || (direction == DMA_DEV_TO_MEM);
+	return (direction == DMA_MEM_TO_DEV) || (direction == DMA_DEV_TO_MEM) ||
+	       (direction == DMA_DEV_TO_DEV);
 }
 
 static inline struct dma_async_tx_descriptor *dmaengine_prep_slave_single(