[PATCH 5.10 138/530] serial: stm32: fix tx dma completion, release channel

[Greg Kroah-Hartman]

From: Erwan Le Ray <erwan.leray@xxxxxxxxxxx>

[ Upstream commit fb4f2e04ac13e7c400e6b86afbbd314a5a2a7e8d ]

This patch add a proper release of dma channels when completing dma tx.

Fixes: 3489187204eb ("serial: stm32: adding dma support")
Signed-off-by: Erwan Le Ray <erwan.leray@xxxxxxxxxxx>
Link: https://lore.kernel.org/r/20210304162308.8984-9-erwan.leray@xxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/tty/serial/stm32-usart.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c
index 44522ddc7e6d..c2d87a8a8fe5 100644
--- a/drivers/tty/serial/stm32-usart.c
+++ b/drivers/tty/serial/stm32-usart.c
@@ -291,6 +291,7 @@ static void stm32_usart_tx_dma_complete(void *arg)
 	struct stm32_port *stm32port = to_stm32_port(port);
 	const struct stm32_usart_offsets *ofs = &stm32port->info->ofs;
 
+	dmaengine_terminate_async(stm32port->tx_ch);
 	stm32_usart_clr_bits(port, ofs->cr3, USART_CR3_DMAT);
 	stm32port->tx_dma_busy = false;
 
-- 
2.30.2