linux-kernel - Re: [PATCH 2/3] mfd: tqmx86: clear GPIO IRQ resource when no IRQ is set

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Message-ID: <5e80dc9aeddd46d837e1c317a008e237bf0b4f8f.camel@ew.tq-group.com>
Date:   Wed, 31 Mar 2021 15:24:22 +0200
From:   Matthias Schiffer <matthias.schiffer@...tq-group.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Lee Jones <lee.jones@...aro.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/3] mfd: tqmx86: clear GPIO IRQ resource when no IRQ is
 set

On Wed, 2021-03-31 at 15:35 +0300, Andy Shevchenko wrote:
> On Wed, Mar 31, 2021 at 2:39 PM Matthias Schiffer
> <matthias.schiffer@...tq-group.com> wrote:
> > 
> > The driver was registering IRQ 0 when no IRQ was set. This leads to
> > warnings with newer kernels.
> > 
> > Clear the resource flags, so no resource is registered at all in this
> > case.
> 
> ...
> 
> >                 /* Assumes the IRQ resource is first. */
> >                 tqmx_gpio_resources[0].start = gpio_irq;
> > +       } else {
> > +               tqmx_gpio_resources[0].flags = 0;
> 
> Please set IORESOURCE_DISABLED flag in the initial structure instead.

Is there any documentation for the correct usage of this flag? I think
I tried IORESOURCE_DISABLED originally, but it didn't have any effect
(platform_get_irq() ignored the flag and returned the resource
anyways). I might misremember though, I originally wrote the series
some time ago.


> 
> >         }
> 
>