On Thu, Nov 19, 2020 at 05:01:29PM +0800, Tian Tao wrote:
> The code has been in a irq-disabled context since it is hard IRQ. There
> is no necessity to do it again.
>
> Signed-off-by: Tian Tao <tiantao6@xxxxxxxxxxxxx>
> ---
> drivers/tty/serial/owl-uart.c | 5 ++---
> 1 file changed, 2 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/tty/serial/owl-uart.c b/drivers/tty/serial/owl-uart.c
> index c149f8c3..472fdaf 100644
> --- a/drivers/tty/serial/owl-uart.c
> +++ b/drivers/tty/serial/owl-uart.c
> @@ -251,10 +251,9 @@ static void owl_uart_receive_chars(struct uart_port *port)
> static irqreturn_t owl_uart_irq(int irq, void *dev_id)
> {
> struct uart_port *port = dev_id;
> - unsigned long flags;
> u32 stat;
>
> - spin_lock_irqsave(&port->lock, flags);
> + spin_lock(&port->lock);
Same thing here; this will break with forced irq threading (i.e.
"threadirqs") since the console code can still end up being called from
interrupt context.
> stat = owl_uart_read(port, OWL_UART_STAT);
>
> @@ -268,7 +267,7 @@ static irqreturn_t owl_uart_irq(int irq, void *dev_id)
> stat |= OWL_UART_STAT_RIP | OWL_UART_STAT_TIP;
> owl_uart_write(port, stat, OWL_UART_STAT);
>
> - spin_unlock_irqrestore(&port->lock, flags);
> + spin_unlock(&port->lock);
>
> return IRQ_HANDLED;
> }
Johan
