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| author |   Douglas Anderson <dianders@chromium.org> | 2020-03-13 13:46:51 -0700 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-03-14 09:40:27 +0100 |
| commit | e83766334f96b3396a71c7baa3b0b53dfd5190cd (patch) | |
| tree | b8b98ef50e6ffb93075097f76d3464e8c60bf7ef /drivers/tty/serial/qcom_geni_serial.c | |
| parent | vt: vt_ioctl: remove unnecessary console allocation checks (diff) | |
| download | linux-dev-e83766334f96b3396a71c7baa3b0b53dfd5190cd.tar.xz linux-dev-e83766334f96b3396a71c7baa3b0b53dfd5190cd.zip | |
tty: serial: qcom_geni_serial: No need to stop tx/rx on UART shutdown
On a board using qcom_geni_serial I found that I could no longer
interact with kdb if I got a crash after the "agetty" running on the
same serial port was killed. This meant that various classes of
crashes that happened at reboot time were undebuggable.
Reading through the code, I couldn't figure out why qcom_geni_serial
felt the need to run so much code at port shutdown time. All we need
to do is disable the interrupt.
After I make this change then a hardcoded kgdb_breakpoint in some late
shutdown code now allows me to interact with the debugger. I also
could freely close / re-open the port without problems.
Fixes: c4f528795d1a ("tty: serial: msm_geni_serial: Add serial driver support for GENI based QUP")
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Link: https://lore.kernel.org/r/20200313134635.1.Icf54c533065306b02b880c46dfd401d8db34e213@changeid
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/serial/qcom_geni_serial.c')
| -rw-r--r-- | drivers/tty/serial/qcom_geni_serial.c | 6 |
1 files changed, 0 insertions, 6 deletions
diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c index 1a61c970f7d6..a77f05b7a649 100644 --- a/drivers/tty/serial/qcom_geni_serial.c +++ b/drivers/tty/serial/qcom_geni_serial.c @@ -825,17 +825,11 @@ static void get_tx_fifo_size(struct qcom_geni_serial_port *port) static void qcom_geni_serial_shutdown(struct uart_port *uport) { - unsigned long flags; - /* Stop the console before stopping the current tx */ if (uart_console(uport)) console_stop(uport->cons); disable_irq(uport->irq); - spin_lock_irqsave(&uport->lock, flags); - qcom_geni_serial_stop_tx(uport); - qcom_geni_serial_stop_rx(uport); - spin_unlock_irqrestore(&uport->lock, flags); } static int qcom_geni_serial_port_setup(struct uart_port *uport) |