From: Yegor Yefremov <yegorslists@xxxxxxxxxxxxxx> uart_handle_cts_change() should be called in IRQ locked state, hence use port->lock to disable interrupts. CC: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx> Signed-off-by: Yegor Yefremov <yegorslists@xxxxxxxxxxxxxx> --- drivers/tty/serial/serial_mctrl_gpio.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/tty/serial/serial_mctrl_gpio.c b/drivers/tty/serial/serial_mctrl_gpio.c index bb5e4f9..85b77ba 100644 --- a/drivers/tty/serial/serial_mctrl_gpio.c +++ b/drivers/tty/serial/serial_mctrl_gpio.c @@ -143,6 +143,9 @@ 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; + + spin_lock_irqsave(&port->lock, flags); mctrl_gpio_get(gpios, &mctrl); @@ -165,6 +168,8 @@ 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; } -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
