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

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Message-Id: <20230307164405.14218-1-johan+linaro@kernel.org>
Date:   Tue,  7 Mar 2023 17:44:01 +0100
From:   Johan Hovold <johan+linaro@...nel.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     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,
        Johan Hovold <johan+linaro@...nel.org>
Subject: [PATCH 0/4] serial: qcom-geni: fix console shutdown hang

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