linux-kernel - Re: [patch 0/5] genirq: Distangle irq_request/release_resources() from irq

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Date:   Fri, 30 Jun 2017 14:49:37 +0100
From:   Marc Zyngier <marc.zyngier@....com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Brian Norris <briannorris@...omium.org>,
        Heiko Stuebner <heiko@...ech.de>,
        linux-rockchip@...ts.infradead.org,
        Julia Cartwright <julia@...com>, linux-gpio@...r.kernel.org,
        John Keeping <john@...anate.com>,
        Doug Anderson <dianders@...omium.org>
Subject: Re: [patch 0/5] genirq: Distangle irq_request/release_resources()
 from irq_desc->lock

On 29/06/17 22:33, Thomas Gleixner wrote:
> The irq_request/release_resources() callbacks are a problem on RT as they
> are called under irq_desc->lock with interrupts disabled.
> 
> Aside of that calling them under irq_desc->lock is conceptually wrong and
> has a (hard to trigger and probably theoretical) issue in free_irq(). See
> patch 4/5 for a detailed explanation.
> 
> The series contains also a fix for the exynos gpio driver, which fiddles
> with the irq masking in the resource callbacks, which is bogus and
> potentially harmful.
> 
> Finally it moves the irq timings deallocation out of the spin locked region.
> 
> Thanks,
> 
> 	tglx
> ---
>  drivers/pinctrl/samsung/pinctrl-exynos.c |    4 --
>  include/linux/irqdesc.h                  |    3 +
>  kernel/irq/irqdesc.c                     |    1 
>  kernel/irq/manage.c                      |   47 +++++++++++++++++++------------
>  4 files changed, 34 insertions(+), 21 deletions(-)

For the series:

Reviewed-by: Marc Zyngier <marc.zyngier@....com>

	M.
-- 
Jazz is not dead. It just smells funny...