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

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Date:   Tue, 7 Mar 2023 17:47:27 +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 17:44, Bartosz Golaszewski
<bartosz.golaszewski@...aro.org> wrote:
>
> 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

Nevermind, I read your other message now. And also patch 3/4 looks right.

Bart