[PATCH] crypto: cesa: check for sram_dma NULL

[Rosen Penev]

dma_map_resource() might fail. In such a case, don't call
dma_unmap_resource()

Fixes: 37d728f76c41 ("crypto: marvell/cesa - Fix DMA API misuse")
Signed-off-by: Rosen Penev <rosenp@xxxxxxxxx>
---
 drivers/crypto/marvell/cesa/cesa.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/crypto/marvell/cesa/cesa.c b/drivers/crypto/marvell/cesa/cesa.c
index 57c9295be711..bcbb909c48d8 100644
--- a/drivers/crypto/marvell/cesa/cesa.c
+++ b/drivers/crypto/marvell/cesa/cesa.c
@@ -406,7 +406,7 @@ static void mv_cesa_put_sram(struct platform_device *pdev, int idx)
 	if (engine->pool)
 		gen_pool_free(engine->pool, (unsigned long)engine->sram_pool,
 			      cesa->sram_size);
-	else
+	else if (engine->sram_dma)
 		dma_unmap_resource(cesa->dev, engine->sram_dma,
 				   cesa->sram_size, DMA_BIDIRECTIONAL, 0);
 }
-- 
2.55.0