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

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Date:   Wed, 8 Mar 2023 11:24:31 -0600
From:   Andrew Halaney <ahalaney@...hat.com>
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>,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.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, Mar 07, 2023 at 05:44:01PM +0100, Johan Hovold 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
> 

Realized this has been affecting me (with me blaming it on something
else prior) off and on. Thanks for the fix!

Reviewed-by: Andrew Halaney <ahalaney@...hat.com>
Tested-by: Andrew Halaney <ahalaney@...hat.com> # sa8540p-ride