Since the TX and RX DMA-slave config structures are declared on the
stack and only a part of their fields is initialized further in the
prepare Tx/Rx methods, the next dmaengine_slave_config() calls may
randomly perform an incorrect DMA channels setup depending on the
stack initial values. Lets fix this by zeroing the config-structures
before using them.

Co-developed-by: Georgy Vlasov <redacted>
Signed-off-by: Georgy Vlasov <redacted>
Signed-off-by: Serge Semin <redacted>
Cc: Ramil Zaripov <redacted>
Cc: Alexey Malahov <redacted>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Paul Burton <paulburton@kernel.org>
Cc: Ralf Baechle <redacted>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Allison Randal <redacted>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Gareth Williams <redacted>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: linux-mips@vger.kernel.org
Cc: devicetree@vger.kernel.org
---
 drivers/spi/spi-dw-dma.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/spi-dw-dma.c b/drivers/spi/spi-dw-dma.c
index d89a00fb705e..3802d2cafe91 100644
--- a/drivers/spi/spi-dw-dma.c
+++ b/drivers/spi/spi-dw-dma.c

@@ -166,7 +166,7 @@ static void dw_spi_dma_tx_done(void *arg)
 static struct dma_async_tx_descriptor *dw_spi_dma_prepare_tx(struct dw_spi *dws,
 		struct spi_transfer *xfer)
 {
-	struct dma_slave_config txconf;
+	struct dma_slave_config txconf = {0};
 	struct dma_async_tx_descriptor *txdesc;
 
 	if (!xfer->tx_buf)

@@ -238,7 +238,7 @@ static void dw_spi_dma_rx_done(void *arg)
 static struct dma_async_tx_descriptor *dw_spi_dma_prepare_rx(struct dw_spi *dws,
 		struct spi_transfer *xfer)
 {
-	struct dma_slave_config rxconf;
+	struct dma_slave_config rxconf = {0};
 	struct dma_async_tx_descriptor *rxdesc;
 
 	if (!xfer->rx_buf)

-- 
2.25.1