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

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Date:   Wed, 30 Nov 2022 13:43:56 +0100
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Jiri Slaby <jirislaby@...nel.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Vinod Koul <vkoul@...nel.org>, Alex Elder <elder@...nel.org>,
        Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-serial@...r.kernel.org,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>
Subject: Re: [PATCH v4 11/13] tty: serial: qcom-geni-serial: stop operations
 in progress at shutdown

On Wed, Nov 30, 2022 at 10:37 AM Jiri Slaby <jirislaby@...nel.org> wrote:
>
> On 29. 11. 22, 12:00, Bartosz Golaszewski wrote:
> > From: Bartosz Golaszewski <bartosz.golaszewski@...aro.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@...aro.org>
> > Reviewed-by: Konrad Dybcio <konrad.dybcio@...aro.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