linux-kernel - Re: [PATCH 4.4 093/113] pinctrl: msm: Really mask level interrupts to prevent latching

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Date:   Wed, 10 Oct 2018 14:12:01 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Nathan Chancellor <natechancellor@...il.com>
Cc:     Greg KH <gregkh@...uxfoundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        stable <stable@...r.kernel.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Doug Anderson <dianders@...omium.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: Re: [PATCH 4.4 093/113] pinctrl: msm: Really mask level interrupts to
 prevent latching

On Wed, Oct 10, 2018 at 9:53 AM Nathan Chancellor
<natechancellor@...il.com> wrote:
> On Wed, Oct 10, 2018 at 09:12:58AM +0200, Linus Walleij wrote:
> > On Tue, Oct 9, 2018 at 8:33 AM Nathan Chancellor
> > <natechancellor@...il.com> wrote:
> >
> > > Sigh, sorry, I caught this after I sent my initial all good email but
> > > this commit breaks NFC on my Pixel 2 XL (toggle becomes greyed out and
> > > apps that want to use it ask to enable it). I can't say why, I'm more
> > > than happy to debug but I'm assuming it's some voodoo that Qualcomm has
> > > done out of tree. I'll leave it up to you how to proceed given that I
> > > can't run mainline :(
> >
> > Which NFC driver is this?
> > Just want to make sure it looks sane.
> >
> > Yours,
> > Linus Walleij
>
> Hi Linus and Bjorn,
>
> These two files should be it I believe:
> https://android.googlesource.com/kernel/msm/+/android-9.0.0_r0.22/drivers/nfc/nq-nci.c
> https://android.googlesource.com/kernel/msm/+/android-9.0.0_r0.22/drivers/nfc/ese/pn81a.c
>
> Sorry I didn't get around to digging into this further today, I will try
> to get to it in the morning.

I'm confused. These are not in the mainline kernel and presumably
not in the stable kernel either.

So when you say "this commit breaks NFC on my Pixel 2 XL" you
mean that when you apply this commit to the android msm kernel,
which has a few other stable fixes backported, it breaks?

I know we have some kind of semi-tolerance for outoftree code
and we should preferrably try not to break it, especially not on
stable kernels, but the responsibility is sometimes just
overwhelming, sorry :(

Yours,
Linus Walleij