linux-kernel - Re: [PATCH 0/3] gpiolib: generalize GPIO line names property

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Message-ID: <CAMRc=MdNxxAHQK5i4rZo3d4iy5JNco-f0V-UzVNTTJQyH6AZpA@mail.gmail.com>
Date:   Wed, 16 Sep 2020 15:29:58 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Anders Roxell <anders.roxell@...aro.org>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Kent Gibson <warthog618@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        lkft-triage@...ts.linaro.org,
        Linux-Next Mailing List <linux-next@...r.kernel.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>
Subject: Re: [PATCH 0/3] gpiolib: generalize GPIO line names property

On Tue, Sep 15, 2020 at 2:02 PM Anders Roxell <anders.roxell@...aro.org> wrote:
>
> On Tue, 8 Sep 2020 at 18:40, Bartosz Golaszewski <brgl@...ev.pl> wrote:
> >
> > From: Bartosz Golaszewski <bgolaszewski@...libre.com>
> >
> > I initially sent this as part of the gpio-mockup overhaul but since
> > these patches are indepentent and the work on gpio-mockup may become
> > more complicated - I'm sending these separately.
> >
> > The only change is adding additional property helpers to count strings
> > in array.
> >
> > Bartosz Golaszewski (3):
> >   device: property: add helpers to count items in string arrays
> >   gpiolib: generalize devprop_gpiochip_set_names() for device properties
> >   gpiolib: unexport devprop_gpiochip_set_names()
>
> I do an arm64 allmodconfig build fron linux-next (tag: next-20200915) and
> run that in qemu. When I run I see the following output (see full log [1]):
> "BUG: KASAN: null-ptr-deref in device_property_read_string_array".
>
>

FYI: this fails because someone passes a NULL struct device * to
dev_fwnode() - this is probably caused by some ordering issues in this
patch. I'm working on it.

Bartosz