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serial: mctrl_gpio: add IRQ locking

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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@pengutronix.de>
Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Yegor Yefremov 2016-04-29 10:45:07 +02:00 committed by Greg Kroah-Hartman
parent fa01e2ca9f
commit d11df61853
1 changed files with 5 additions and 0 deletions
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5
drivers/tty/serial/serial_mctrl_gpio.c
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@ -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;
}