linux-kernel - Re: [PATCH v2] genirq: Set IRQCHIP_SKIP_SET_WAKE flag for dummy_irq

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Date:	Mon, 11 May 2015 12:50:22 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Roger Quadros <rogerq@...com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Chanwoo Choi <cw00.choi@...sung.com>,
	Felipe Balbi <balbi@...com>, Tony Lindgren <tony@...mide.com>,
	USB list <linux-usb@...r.kernel.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Gregory CLEMENT <gregory.clement@...e-electrons.com>
Subject: Re: [PATCH v2] genirq: Set IRQCHIP_SKIP_SET_WAKE flag for dummy_irq_chip

On Wed, Apr 15, 2015 at 10:14 AM, Roger Quadros <rogerq@...com> wrote:
> Without this system suspend is broken on systems that have
> drivers calling enable/disable_irq_wake() for interrupts based off
> the dummy irq hook.

Good to see this was applied. Still, I think no_irq_chip should also be
fixed, cfr. my patch "genirq: Set IRQCHIP_SKIP_SET_WAKE for no_irq_chip and
dummy_irq_chip" (https://lkml.org/lkml/2015/1/12/506 is down, but
https://patchwork.ozlabs.org/patch/427788/ works)

> (e.g. drivers/gpio/gpio-pcf857x.c)

Please note the particular pfc857x.c case was fixed by commit b80eef95beb04760
("gpio: pcf857x: Propagate wake-up setting to parent irq controller"), as that
driver has other problems. Now it no longer uses dummy_irq_chip.

> http://article.gmane.org/gmane.linux.kernel/1879035
>
> Signed-off-by: Roger Quadros <rogerq@...com>
> ---
>  kernel/irq/dummychip.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/kernel/irq/dummychip.c b/kernel/irq/dummychip.c
> index 988dc58..2feb6fe 100644
> --- a/kernel/irq/dummychip.c
> +++ b/kernel/irq/dummychip.c
> @@ -57,5 +57,6 @@ struct irq_chip dummy_irq_chip = {
>         .irq_ack        = noop,
>         .irq_mask       = noop,
>         .irq_unmask     = noop,
> +       .flags          = IRQCHIP_SKIP_SET_WAKE,
>  };
>  EXPORT_SYMBOL_GPL(dummy_irq_chip);
> --
> 2.1.0


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
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