[PATCH 5.12 168/677] serial: stm32: call stm32_transmit_chars locked

[Greg Kroah-Hartman]

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

[ Upstream commit f16b90c2d9db3e6ac719d1946b9d335ca4ab33f3 ]

stm32_transmit_chars should be called under lock also in tx DMA callback.

Fixes: 3489187204eb ("serial: stm32: adding dma support")
Signed-off-by: Erwan Le Ray <erwan.leray@xxxxxxxxxxx>
Signed-off-by: Fabrice Gasnier <fabrice.gasnier@xxxxxxxxxxx>
Link: https://lore.kernel.org/r/20210304162308.8984-10-erwan.leray@xxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/tty/serial/stm32-usart.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c
index 74046ae3a412..2bdd04a47f91 100644
--- a/drivers/tty/serial/stm32-usart.c
+++ b/drivers/tty/serial/stm32-usart.c
@@ -291,13 +291,16 @@ static void stm32_usart_tx_dma_complete(void *arg)
 	struct uart_port *port = arg;
 	struct stm32_port *stm32port = to_stm32_port(port);
 	const struct stm32_usart_offsets *ofs = &stm32port->info->ofs;
+	unsigned long flags;
 
 	dmaengine_terminate_async(stm32port->tx_ch);
 	stm32_usart_clr_bits(port, ofs->cr3, USART_CR3_DMAT);
 	stm32port->tx_dma_busy = false;
 
 	/* Let's see if we have pending data to send */
+	spin_lock_irqsave(&port->lock, flags);
 	stm32_usart_transmit_chars(port);
+	spin_unlock_irqrestore(&port->lock, flags);
 }
 
 static void stm32_usart_tx_interrupt_enable(struct uart_port *port)
-- 
2.30.2