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 <[email protected]> Signed-off-by: Georgy Vlasov <[email protected]> Signed-off-by: Serge Semin <[email protected]> Cc: Ramil Zaripov <[email protected]> Cc: Alexey Malahov <[email protected]> Cc: Thomas Bogendoerfer <[email protected]> Cc: Paul Burton <[email protected]> Cc: Ralf Baechle <[email protected]> Cc: Arnd Bergmann <[email protected]> Cc: Allison Randal <[email protected]> Cc: Andy Shevchenko <[email protected]> Cc: Gareth Williams <[email protected]> Cc: Rob Herring <[email protected]> Cc: [email protected] Cc: [email protected] --- 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
