linux-kernel - Re: [PATCH 0/4] serial: qcom-geni: fix console shutdown hang

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Message-ID: <CACMJSes3usJUvCsrMBR_9dDGCbo2y7JqA8-B5mP28H2Cjg-v6A@mail.gmail.com>
Date:   Tue, 7 Mar 2023 17:44:24 +0100
From:   Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
To:     Johan Hovold <johan+linaro@...nel.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Douglas Anderson <dianders@...omium.org>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        linux-arm-msm@...r.kernel.org, linux-serial@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/4] serial: qcom-geni: fix console shutdown hang

On Tue, 7 Mar 2023 at 17:43, Johan Hovold <johan+linaro@...nel.org> wrote:
>
> This series fixes some of the fallout after a recent series adding
> support for DMA transfers to the Qualcomm geni serial driver.
>
> Most importantly it fixes a hang during reboot when using a serial
> console and the getty is stopped during reboot.
>
> Doug just posted an equivalent fix here:
>
>         https://lore.kernel.org/lkml/20230307073155.1.Iaab0159b8d268060a0e131ebb27125af4750ef99@changeid
>
> but the commit message only mentions the regression with respect to
> kgdb, which is not as widely used serial consoles generally, so I
> figured I'd post my version for completeness.
>
> Either version of that fix should address the immediate regression, but
> fixing the underlying problems which have been there since the driver
> was first merged is going to be a bit more involved.
>
> The rest of the series fixes a few bugs in the new DMA support that I
> found while investigating the console regression.
>
> Johan
>
>
> Johan Hovold (4):
>   serial: qcom-geni: fix console shutdown hang
>   serial: qcom-geni: fix DMA mapping leak on shutdown
>   serial: qcom-geni: fix mapping of empty DMA buffer
>   serial: qcom-geni: drop bogus uart_write_wakeup()
>
>  drivers/tty/serial/qcom_geni_serial.c | 11 +++++++----
>  1 file changed, 7 insertions(+), 4 deletions(-)
>
> --
> 2.39.2
>

Hey Johan,

Douglas and Srini beat you to these fixes but thanks!

Bart