linux-kernel - Re: [PATCH v2] pinctrl: renesas: rzg2l: Execute atomically the interrupt configuration

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Date: Wed, 20 Mar 2024 11:12:10 +0100
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Claudiu <claudiu.beznea@...on.dev>
Cc: linus.walleij@...aro.org, linux-renesas-soc@...r.kernel.org, 
	linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
Subject: Re: [PATCH v2] pinctrl: renesas: rzg2l: Execute atomically the
 interrupt configuration

On Mon, Mar 18, 2024 at 3:31 PM Claudiu <claudiu.beznea@...on.dev> wrote:
> From: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
>
> Lockdep detects a possible deadlock as listed below. This is because it
> detects the IA55 interrupt controller .irq_eoi() API is called from
> interrupt context while configuration-specific API (e.g., .irq_enable())
> could be called from process context on resume path (by calling
> rzg2l_gpio_irq_restore()). To avoid this, protect the call of
> rzg2l_gpio_irq_enable() with spin_lock_irqsave()/spin_unlock_irqrestore().
> With this the same approach that is available in __setup_irq() is mimicked
> to pinctrl IRQ resume function.
>
> Below is the lockdep report:

[...]

> Fixes: 254203f9a94c ("pinctrl: renesas: rzg2l: Add suspend/resume support")
> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
> ---
>
> Changes in v2:
> - used raw_spin_lock_irqsave()/raw_spin_unlock_irqrestore()

Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>
i.e. will queue in renesas-pinctrl for v6.10.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68korg

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