在 2020/11/20 16:23, Johan Hovold 写道:
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.
As the following code shows, owl_uart_irq does not run in the irq
threading context.
ret = request_irq(port->irq, owl_uart_irq, IRQF_TRIGGER_HIGH,
"owl-uart", port);
if (ret)
return ret;
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
.
