[PATCH v2 4/5] serial: mctrl_gpio: add IRQ locking

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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

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