linux-kernel - Re: [PATCH v2 1/2] gpiolib: irqchip: use different lockdep class for each gpio irqchip

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Message-ID: <CACRpkdbB7YY6pBhyG6_Rq9BY1Xk-tikk2_88D5YHibaGDm+5DQ@mail.gmail.com>
Date:	Mon, 17 Aug 2015 15:33:04 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Grygorii Strashko <grygorii.strashko@...com>
Cc:	Alexandre Courbot <gnurou@...il.com>,
	Linux-OMAP <linux-omap@...r.kernel.org>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	Sekhar Nori <nsekhar@...com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Roger Quadros <rogerq@...com>
Subject: Re: [PATCH v2 1/2] gpiolib: irqchip: use different lockdep class for
 each gpio irqchip

On Mon, Aug 17, 2015 at 2:35 PM, Grygorii Strashko
<grygorii.strashko@...com> wrote:

> Since IRQ chip helpers were introduced drivers lose ability to
> register separate lockdep classes for each registered GPIO IRQ
> chip and the gpiolib now is using shared lockdep class for
> all GPIO IRQ chips (gpiochip_irq_lock_class).
> As result, lockdep will produce warning when there are min two
> stacked GPIO chips and all of them are interrupt controllers.
>
> HW configuration which generates lockdep warning (TI dra7-evm):
(...)
> Cc: Geert Uytterhoeven <geert@...ux-m68k.org>
> Cc: Roger Quadros <rogerq@...com>
> Reported-by: Roger Quadros <rogerq@...com>
> Tested-by: Roger Quadros <rogerq@...com>
> Signed-off-by: Grygorii Strashko <grygorii.strashko@...com>
> ---
> Changes in v2:
> - removed accidental change in gpio chip structure description.

This v2 patch applied. I see no better alternative.

Yours,
Linus Walleij
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