[PATCH 6.6 008/121] dmaengine: fix is_slave_direction() return false when DMA_DEV_TO_DEV

6.6-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Frank Li <Frank.Li@nxp.com>

[ Upstream commit a22fe1d6dec7e98535b97249fdc95c2be79120bb ]

is_slave_direction() should return true when direction is DMA_DEV_TO_DEV.

Fixes: 49920bc66984 ("dmaengine: add new enum dma_transfer_direction")
Signed-off-by: Frank Li <Frank.Li@nxp.com>
Link: https://lore.kernel.org/r/20240123172842.3764529-1-Frank.Li@nxp.com (local)
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 include/linux/dmaengine.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index c3656e590213..cff3dba65820 100644
--- a/include/linux/dmaengine.h
+++ b/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(

-- 
2.43.0