linux-kernel - Re: [PATCH] gpio: pca953x: Survive spurious interrupts

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Message-ID: <CACRpkdbctO9cWZZhVQHWkA1DN7YRTsLRo4Ub9g2x7q6BBSD=Ug@mail.gmail.com>
Date:   Wed, 7 Oct 2020 11:48:06 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Marc Zyngier <maz@...nel.org>
Cc:     "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        kernel-team@...roid.com
Subject: Re: [PATCH] gpio: pca953x: Survive spurious interrupts

On Mon, Oct 5, 2020 at 4:02 PM Marc Zyngier <maz@...nel.org> wrote:

> The pca953x driver never checks the result of irq_find_mapping(),
> which returns 0 when no mapping is found. When a spurious interrupt
> is delivered (which can happen under obscure circumstances), the
> kernel explodes as it still tries to handle the error code as
> a real interrupt.
>
> Handle this particular case and warn on spurious interrupts.
>
> Signed-off-by: Marc Zyngier <maz@...nel.org>

Patch applied for fixes.

Yours,
Linus Walleij