Re: [PATCH 1/2] tty: serial: qcom_geni_serial: No need to stop tx/rx on UART shutdown

[Stephen Boyd]

Quoting Douglas Anderson (2020-03-13 13:46:51)
> 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@xxxxxxxxxxxx>
> ---

Matches what is described in Documentation/driver-api/serial/driver.rst

Reviewed-by: Stephen Boyd <swboyd@xxxxxxxxxxxx>