Re: [PATCH v4 11/13] tty: serial: qcom-geni-serial: stop operations in progress at shutdown

Bartosz Golaszewski
2022-11-30T12:44:24Z

On Wed, Nov 30, 2022 at 10:37 AM Jiri Slaby <jirislaby@kernel.org> wrote:
>
> On 29. 11. 22, 12:00, Bartosz Golaszewski wrote:
> > From: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
> >
> > We don't stop transmissions in progress at shutdown. This is fine with
> > FIFO SE mode but with DMA it causes trouble so fix it now.
> >
> > Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
> > Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
> > ---
> > drivers/tty/serial/qcom_geni_serial.c | 3 +++
> > 1 file changed, 3 insertions(+)
> >
> > diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c
> > index fe15fc0e1345..c0270eec2a66 100644
> > --- a/drivers/tty/serial/qcom_geni_serial.c
> > +++ b/drivers/tty/serial/qcom_geni_serial.c
> > @@ -864,6 +864,9 @@ static void get_tx_fifo_size(struct qcom_geni_serial_port *port)
> >
> > static void qcom_geni_serial_shutdown(struct uart_port *uport)
> > {
> > + qcom_geni_serial_stop_tx(uport);
> > + qcom_geni_serial_stop_rx(uport);
> > +
> > disable_irq(uport->irq);
>
> I'm just asking without actually looking into the code: cannot the
> interrupt reschedule/restart the above?
>

It can actually, good catch, thanks.

Bart