linux-kernel - Re: [PATCH v2 1/2] gpio: em: remove the gpiochip before removing the irq domain

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Message-ID: <CAMRc=MdD=JPerECFAeXW+FG=gsRLLR8X3AxfyCxfqFeOATQA9w@mail.gmail.com>
Date:   Mon, 15 Jul 2019 11:58:22 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Phil Reid <preid@...ctromag.com.au>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        stable <stable@...r.kernel.org>,
        Niklas Söderlund 
        <niklas.soderlund+renesas@...natech.se>
Subject: Re: [PATCH v2 1/2] gpio: em: remove the gpiochip before removing the
 irq domain

czw., 11 lip 2019 o 10:47 Geert Uytterhoeven <geert@...ux-m68k.org> napisał(a):
>
> CC Niklas, who has the hardware
>
> On Thu, Jul 11, 2019 at 10:29 AM Bartosz Golaszewski <brgl@...ev.pl> wrote:
> > From: Bartosz Golaszewski <bgolaszewski@...libre.com>
> >
> > In commit 8764c4ca5049 ("gpio: em: use the managed version of
> > gpiochip_add_data()") we implicitly altered the ordering of resource
> > freeing: since gpiochip_remove() calls gpiochip_irqchip_remove()
> > internally, we now can potentially use the irq_domain after it was
> > destroyed in the remove() callback (as devm resources are freed after
> > remove() has returned).
> >
> > Use devm_add_action_or_reset() to keep the ordering right and entirely
> > kill the remove() callback in the driver.
> >
> > Reported-by: Geert Uytterhoeven <geert@...ux-m68k.org>
> > Fixes: 8764c4ca5049 ("gpio: em: use the managed version of gpiochip_add_data()")
> > Cc: stable@...r.kernel.org
> > Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
>
> Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>
>
> Gr{oetje,eeting}s,
>
>                         Geert
>
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org
>
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
>                                 -- Linus Torvalds

Patch applied.