diff options
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/serial/serial_mctrl_gpio.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/tty/serial/serial_mctrl_gpio.c b/drivers/tty/serial/serial_mctrl_gpio.c index 02147361eaa9..9e1086f7f22a 100644 --- a/drivers/tty/serial/serial_mctrl_gpio.c +++ b/drivers/tty/serial/serial_mctrl_gpio.c @@ -125,9 +125,12 @@ static irqreturn_t mctrl_gpio_irq_handle(int irq, void *context) struct uart_port *port = gpios->port; u32 mctrl = gpios->mctrl_prev; u32 mctrl_diff; + unsigned long flags; mctrl_gpio_get(gpios, &mctrl); + spin_lock_irqsave(&port->lock, flags); + mctrl_diff = mctrl ^ gpios->mctrl_prev; gpios->mctrl_prev = mctrl; @@ -147,6 +150,8 @@ static irqreturn_t mctrl_gpio_irq_handle(int irq, void *context) wake_up_interruptible(&port->state->port.delta_msr_wait); } + spin_unlock_irqrestore(&port->lock, flags); + return IRQ_HANDLED; } |