diff options
Diffstat (limited to 'drivers/tty/serial/stm32-usart.c')
| -rw-r--r-- | drivers/tty/serial/stm32-usart.c | 4 |
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 |