[PATCH 1/2] serial: stm32: reset dma buffers during probe

[Erwan Le Ray]

Reset Rx and Tx dma buffers during probe to avoid freeing
invalid buffer in no dma mode.

Signed-off-by: Erwan Le Ray <erwan.leray at foss.st.com>

diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c
index c2ae7b392b86..2ac3b30477a7 100644
--- a/drivers/tty/serial/stm32-usart.c
+++ b/drivers/tty/serial/stm32-usart.c
@@ -1168,6 +1168,8 @@ static struct stm32_port *stm32_usart_of_get_port(struct platform_device *pdev)
 	stm32_ports[id].cr1_irq = USART_CR1_RXNEIE;
 	stm32_ports[id].cr3_irq = 0;
 	stm32_ports[id].last_res = RX_BUF_L;
+	stm32_ports[id].rx_dma_buf = 0;
+	stm32_ports[id].tx_dma_buf = 0;
 	return &stm32_ports[id];
 }
 
-- 
2.17.1