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SubjectRe: [PATCH 0/4] serial: qcom-geni: fix console shutdown hang
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On 07/03/2023 17:03, Johan Hovold wrote:
> On Tue, Mar 07, 2023 at 05:47:27PM +0100, Bartosz Golaszewski wrote:
>> On Tue, 7 Mar 2023 at 17:44, Bartosz Golaszewski
>> <bartosz.golaszewski@linaro.org> wrote:
>>>
>>> On Tue, 7 Mar 2023 at 17:43, Johan Hovold <johan+linaro@kernel.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!
>
>> Nevermind, I read your other message now. And also patch 3/4 looks right.
>
> Heh, this hang has been in linux-next for over a month and I've
> actively tried to not spend time on investigating it in the hope that
> someone else would be beat me to it before I moved to 6.3-rc. :)
>
> Obviously I may be a bit biased, but I prefer this series over the
> alternate fixes as the commit messages are a bit more complete and my
> version of the empty DMA buffer fix is a bit cleaner.

I don't mind, as long as the bugs are fixed.


--srini
>
> Johan

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