diff --git a/drivers/spi/spi-rockchip.c b/drivers/spi/spi-rockchip.c
index f5d6cfcb672b..c7761c6e14d9 100644
--- a/drivers/spi/spi-rockchip.c
+++ b/drivers/spi/spi-rockchip.c
@@ -450,6 +450,9 @@ static int rockchip_spi_prepare_dma(struct rockchip_spi *rs)
 	struct dma_slave_config rxconf, txconf;
 	struct dma_async_tx_descriptor *rxdesc, *txdesc;
 
+	memset(&rxconf, 0, sizeof(struct dma_slave_config));
+	memset(&txconf, 0, sizeof(struct dma_slave_config));
+
 	spin_lock_irqsave(&rs->lock, flags);
 	rs->state &= ~RXBUSY;
 	rs->state &= ~TXBUSY;