[PATCH v4 4/8] dmaengine: add verification of DMA_MEMSET_SG in dmaengine

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DMA_MEMSET_SG is missing the verification of having the operation set and
also a supporting function provided.

Fixes: Commit 50c7cd2bd ("dmaengine: Add scatter-gathered memset")

Signed-off-by: Dave Jiang <dave.jiang@xxxxxxxxx>
---
 drivers/dma/dmaengine.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
index 1c424f6..d9a71f0 100644
--- a/drivers/dma/dmaengine.c
+++ b/drivers/dma/dmaengine.c
@@ -935,6 +935,8 @@ int dma_async_device_register(struct dma_device *device)
 		!device->device_prep_dma_pq_val);
 	BUG_ON(dma_has_cap(DMA_MEMSET, device->cap_mask) &&
 		!device->device_prep_dma_memset);
+	BUG_ON(dma_has_cap(DMA_MEMSET_SG, device->cap_mask) &&
+		!device->device_prep_dma_memset_sg);
 	BUG_ON(dma_has_cap(DMA_INTERRUPT, device->cap_mask) &&
 		!device->device_prep_dma_interrupt);
 	BUG_ON(dma_has_cap(DMA_SG_SG, device->cap_mask) &&

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