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

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Message-ID: <22332676-9d3a-1e21-aa70-e9c367b19bd9@kernel.org>
Date:   Wed, 30 Nov 2022 10:37:36 +0100
From:   Jiri Slaby <jirislaby@...nel.org>
To:     Bartosz Golaszewski <brgl@...ev.pl>,
        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>
Cc:     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 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?

thanks,
-- 
js
suse labs