Re: [PATCH v3 3/9] serial: qcom-geni: fix shutdown race

[Johan Hovold]

On Thu, Oct 10, 2024 at 03:36:30PM -0700, Doug Anderson wrote:
> On Wed, Oct 9, 2024 at 7:51 AM Johan Hovold <johan+linaro@xxxxxxxxxx> wrote:
> >
> > A commit adding back the stopping of tx on port shutdown failed to add
> > back the locking which had also been removed by commit e83766334f96
> > ("tty: serial: qcom_geni_serial: No need to stop tx/rx on UART
> > shutdown").
> >
> > Holding the port lock is needed to serialise against the console code,
> > which may update the interrupt enable register and access the port
> > state.
> >
> > Fixes: d8aca2f96813 ("tty: serial: qcom-geni-serial: stop operations in progress at shutdown")
> > Fixes: 947cc4ecc06c ("serial: qcom-geni: fix soft lockup on sw flow control and suspend")
> > Cc: stable@xxxxxxxxxxxxxxx      # 6.3
> > Reviewed-by: Bartosz Golaszewski <bartosz.golaszewski@xxxxxxxxxx>
> > Signed-off-by: Johan Hovold <johan+linaro@xxxxxxxxxx>
> > ---
> >  drivers/tty/serial/qcom_geni_serial.c | 2 ++
> >  1 file changed, 2 insertions(+)
> 
> Though this doesn't fix the preexisting bug I talked about [1] that
> we'll need to touch the same code to fix:
> 
> Reviewed-by: Douglas Anderson <dianders@xxxxxxxxxxxx>

Yeah, let's address that separately. Thanks for reviewing!

Johan

> [1] https://lore.kernel.org/r/CAD=FV=UZtZ1-0SkN2sOMp6YdU02em_RnK85Heg5z0jkH4U30eQ@xxxxxxxxxxxxxx