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

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Message-ID: <ZwjLnIvKZny2joZ1@hovoldconsulting.com>
Date: Fri, 11 Oct 2024 08:54:20 +0200
From: Johan Hovold <johan@...nel.org>
To: Doug Anderson <dianders@...omium.org>
Cc: Johan Hovold <johan+linaro@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jirislaby@...nel.org>,
	Bjorn Andersson <andersson@...nel.org>,
	Konrad Dybcio <konradybcio@...nel.org>,
	Mukesh Kumar Savaliya <quic_msavaliy@...cinc.com>,
	linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-serial@...r.kernel.org, stable@...r.kernel.org,
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH v3 3/9] serial: qcom-geni: fix shutdown race

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@...nel.org> 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@...r.kernel.org      # 6.3
> > Reviewed-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> > Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
> > ---
> >  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@...omium.org>

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

Johan

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