linux-kernel - Re: linux-next 2017-08-08 keyboard failure on Nokia N900

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Date:   Tue, 8 Aug 2017 22:30:06 +0200 (CEST)
From:   Julia Lawall <julia.lawall@...6.fr>
To:     Grygorii Strashko <grygorii.strashko@...com>
cc:     Julia Lawall <julia.lawall@...6.fr>, Pavel Machek <pavel@....cz>,
        pali.rohar@...il.com, sre@...nel.org,
        kernel list <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-omap@...r.kernel.org, tony@...mide.com, khilman@...nel.org,
        aaro.koskinen@....fi, ivo.g.dimitrov.75@...il.com,
        patrikbachan@...il.com, serge@...lyn.com, abcloriens@...il.com
Subject: Re: linux-next 2017-08-08 keyboard failure on Nokia N900



On Tue, 8 Aug 2017, Grygorii Strashko wrote:

>
>
> On 08/08/2017 03:09 PM, Julia Lawall wrote:
> >
> >
> > On Tue, 8 Aug 2017, Grygorii Strashko wrote:
> >
> > >
> > >
> > > On 08/08/2017 06:12 AM, Pavel Machek wrote:
> > > > Hi!
> > > >
> > > > > > I tried today's linux-next. It boots on n900 (up to X), but then my
> > > > > > screen locks and I can't get back. Touchscreen worked, so my guess
> > > > > > is
> > > > > > keyboard does not...? Ssh connection over usb still works.
> > > > >
> > > > > Confirmed, its the keyboard.
> > > > >
> > > > > Additionally, battery monitoring fails, because neither
> > > > >
> > > > > /sys/class/power_supply/{n900-,rx51-}battery/voltage_now
> > > > >
> > > > > exists.
> > > >
> > > > And dmesg is helpful in this case:
> > > >
> > > > [    0.675201] input: twl4030_pwrbutton as
> > > > /devices/platform/68000000.ocp/48070000.i2c/i2c-1/1-0048/48070000.i2c:twl@48:pwrbutton/input/input1
> > > > [    0.676635] input: TWL4030 Keypad as
> > > > /devices/platform/68000000.ocp/48070000.i2c/i2c-1/1-0048/48070000.i2c:twl@48:keypad/input/input2
> > > > [    0.679138] twl4030_keypad 48070000.i2c:twl@48:keypad: request_irq
> > > > failed for irq no=156: -13
> > > > [    0.679779] twl4030_keypad: probe of 48070000.i2c:twl@48:keypad
> > > > failed with error -13
> > > > [    0.682769] twl4030_madc 48070000.i2c:twl@48:madc: could not
> > > > request irq
> > > > [    0.684051] twl4030_madc: probe of 48070000.i2c:twl@48:madc failed
> > > > with error -13
> > > > [    0.685852] input: twl4030:vibrator as
> > > > /devices/platform/68000000.ocp/48070000.i2c/i2c-1/1-0048/48070000.i2c:twl@48:audio/twl4030-vibra/input/input3
> > > > [    0.768890] omap_i2c 48070000.i2c: bus 1 rev3.3 at 2200 kHz
> > > >
> > >
> > > I've not precisely checked it, but smth is telling me that below
> > > patch  can cause this:
> > >
> > > commit 78daaca78ee57dead0f4aa5ee399f0499e81cd9e
> > > Author: Julia Lawall <Julia.Lawall@...6.fr>
> > > Date:   Thu May 4 22:10:50 2017 +0200
> > >
> > >      mfd: twl4030-irq: Drop unnecessary static
> > >
> > >      Drop static on a local variable, when the variable is initialized
> > > before
> > >      any use, on every possible execution path through the function.
> > >
> > > --- a/drivers/mfd/twl4030-irq.c
> > > +++ b/drivers/mfd/twl4030-irq.c
> > > @@ -685,7 +685,7 @@ int twl4030_sih_setup(struct device *dev, int module,
> > > int irq_base)
> > >
> > >   int twl4030_init_irq(struct device *dev, int irq_num)
> > >   {
> > > -       static struct irq_chip  twl4030_irq_chip;
> > > +       struct irq_chip twl4030_irq_chip;
> > >
> > >
> > > but if we will look at code - it can be seen that this variable is passed
> > > by reference to
> > > irq_set_chip_and_handler().
> > > Ops. And what will happen when twl4030_init_irq() returns ;)
> >
> > The patch is not correct as was already noted when it was submitted:
> >
> > https://lkml.org/lkml/2017/7/15/169
> > https://lkml.org/lkml/2017/7/15/171
> >
> > Do you need a patch reverting this one?
>
> Hm. This one is in linux-next, but shouldn't. Right?
>
>  git log --oneline  -10 linux-next/master
> c0b96db Add linux-next specific files for 20170808
>
> git log --oneline  linux-next/master | grep "Drop unnecessary static"
> 78daaca mfd: twl4030-irq: Drop unnecessary static

OK, it seems like the patch was made twice, the second one was commented
on and the first one was applied.  78daaca should not be there.

julia