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-rw-r--r--drivers/tty/serial/stm32-usart.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c
index 24c4d821472a..3b99d790fb3f 100644
--- a/drivers/tty/serial/stm32-usart.c
+++ b/drivers/tty/serial/stm32-usart.c
@@ -321,6 +321,8 @@ static irqreturn_t stm32_interrupt(int irq, void *ptr)
struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
u32 sr;
+ spin_lock(&port->lock);
+
sr = readl_relaxed(port->membase + ofs->isr);
if ((sr & USART_SR_RXNE) && !(stm32_port->rx_ch))
@@ -329,6 +331,8 @@ static irqreturn_t stm32_interrupt(int irq, void *ptr)
if ((sr & USART_SR_TXE) && !(stm32_port->tx_ch))
stm32_transmit_chars(port);
+ spin_unlock(&port->lock);
+
if (stm32_port->rx_ch)
return IRQ_WAKE_THREAD;
else