linux-kernel - Re: [patch 16/30] mfd: ab8500-debugfs: Remove the racy fiddling with irq

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Message-ID: <20201211100436.GC5029@dell>
Date:   Fri, 11 Dec 2020 10:04:36 +0000
From:   Lee Jones <lee.jones@...aro.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Marc Zyngier <maz@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-arm-kernel@...ts.infradead.org,
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        Helge Deller <deller@....de>,
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Subject: Re: [patch 16/30] mfd: ab8500-debugfs: Remove the racy fiddling with
 irq_desc

On Thu, 10 Dec 2020, Thomas Gleixner wrote:

> First of all drivers have absolutely no business to dig into the internals
> of an irq descriptor. That's core code and subject to change. All of this
> information is readily available to /proc/interrupts in a safe and race
> free way.
> 
> Remove the inspection code which is a blatant violation of subsystem
> boundaries and racy against concurrent modifications of the interrupt
> descriptor.
> 
> Print the irq line instead so the information can be looked up in a sane
> way in /proc/interrupts.
> 
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> Cc: Linus Walleij <linus.walleij@...aro.org>
> Cc: Lee Jones <lee.jones@...aro.org>
> Cc: linux-arm-kernel@...ts.infradead.org
> ---
>  drivers/mfd/ab8500-debugfs.c |   16 +++-------------
>  1 file changed, 3 insertions(+), 13 deletions(-)

Acked-by: Lee Jones <lee.jones@...aro.org>

-- 
Lee Jones [李琼斯]
Senior Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
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