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

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Hello Yegor,

On Mon, Apr 04, 2016 at 03:44:23PM +0200, Yegor Yefremov wrote:
> On Tue, Mar 22, 2016 at 2:12 PM,  <yegorslists@xxxxxxxxxxxxxx> wrote:
> > 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;
> >  }
> 
> Could you please test this patch with Atmel UART?
> 
> Should this patch be actually removed this series and sent separately?

I don't have at91 ready to test. I added Nicolas to Cc who tested 
18dfef9c7f87 ("serial: atmel: convert to irq handling provided mctrl-gpio").

I guess the problem that your patch intends to fix is obvious with lock
debugging enabled?

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
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