From f16b90c2d9db3e6ac719d1946b9d335ca4ab33f3 Mon Sep 17 00:00:00 2001 From: Erwan Le Ray Date: Thu, 4 Mar 2021 17:23:04 +0100 Subject: [PATCH] serial: stm32: call stm32_transmit_chars locked 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 Signed-off-by: Fabrice Gasnier Link: https://lore.kernel.org/r/20210304162308.8984-10-erwan.leray@foss.st.com Signed-off-by: Greg Kroah-Hartman --- 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)