linux-kernel - Re: [PATCH 09/13] pinctrl: qcom: spmi-gpio: drop broken pm8008 support

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Date: Wed, 29 May 2024 18:12:21 +0200
From: Johan Hovold <johan@...nel.org>
To: Linus Walleij <linus.walleij@...aro.org>
Cc: Johan Hovold <johan+linaro@...nel.org>, Lee Jones <lee@...nel.org>,
	Mark Brown <broonie@...nel.org>,
	Bjorn Andersson <andersson@...nel.org>,
	Konrad Dybcio <konrad.dybcio@...aro.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Das Srinagesh <quic_gurus@...cinc.com>,
	Satya Priya <quic_c_skakit@...cinc.com>,
	Stephen Boyd <swboyd@...omium.org>, linux-arm-msm@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-gpio@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH 09/13] pinctrl: qcom: spmi-gpio: drop broken pm8008
 support

On Mon, May 27, 2024 at 03:35:41PM +0200, Linus Walleij wrote:
> On Mon, May 6, 2024 at 5:10 PM Johan Hovold <johan+linaro@...nel.org> wrote:
> 
> > The SPMI GPIO driver assumes that the parent device is an SPMI device
> > and accesses random data when backcasting the parent struct device
> > pointer for non-SPMI devices.
> >
> > Fortunately this does not seem to cause any issues currently when the
> > parent device is an I2C client like the PM8008, but this could change if
> > the structures are reorganised (e.g. using structure randomisation).
> >
> > Notably the interrupt implementation is also broken for non-SPMI devices.
> >
> > Also note that the two GPIO pins on PM8008 are used for interrupts and
> > reset so their practical use should be limited.
> >
> > Drop the broken GPIO support for PM8008 for now.
> >
> > Fixes: ea119e5a482a ("pinctrl: qcom-pmic-gpio: Add support for pm8008")
> > Cc: stable@...r.kernel.org      # 5.13
> > Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
> 
> Is this something I can just apply, maybe with the DT binding drop
> patch right (8/13) after it?

Yes, I guess so, unless it's easier to let everything go through MFD
(except possibly the regulator driver).

I'll be posting a v2 in a bit and include these two there too. You can
either pick them there or ack them as you prefer.

> IIUC it does not need to go into fixes because there are no regressions,
> right?

As I mentioned in the commit message, the driver is backcasting a
pointer to an incorrect type, which could lead to all sorts of trouble
even if it does not seem to be the case currently (I did not check 5.13
for example).

Since it has always been broken, I'd rather err on the safe side and
just drop it also from the stable trees.

Johan