From: Yegor Yefremov <yegorslists@xxxxxxxxxxxxxx>
uart_handle_cts_change should be called with port->lock held. And for
this to be save you must also disable irqs.
Acked-by: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx>
Signed-off-by: Yegor Yefremov <yegorslists@xxxxxxxxxxxxxx>
---
Changes:
v4: move lock after mctrl_gpio_get (Uwe Kleine-König)
v3: send this patch separately from the 8259 mctrl_gpio series
and improve commit wording (Uwe Kleine-König)
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..f18df52 100644
--- a/drivers/tty/serial/serial_mctrl_gpio.c
+++ b/drivers/tty/serial/serial_mctrl_gpio.c
@@ -143,9 +143,12 @@ 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;
@@ -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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