linux-kernel - Re: [PATCH] gpio: pca953x: Clear irq trigger type on irq shutdown

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Date:   Wed, 23 May 2018 11:48:23 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Grigoryev Denis <grigoryev@...twel.ru>
Cc:     "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] gpio: pca953x: Clear irq trigger type on irq shutdown

On Fri, May 4, 2018 at 6:53 PM, Grigoryev Denis <grigoryev@...twel.ru> wrote:

> The driver stores the result of irq_set_type() in the internal variables
> irq_trig_raise and irq_trig_fall, which later are used to determine
> the GPIOs that must be re-configured as input. These variables retain their
> value between gpiolib's  export / unexport, resulting in an incorrect
> state in some cases. The corresponding bits in the variables
> irq_trig_raise and irq_trig_fall should be cleared in irq_shutdown().
>
> Signed-off-by: Denis Grigoryev <grigoryev@...twel.ru>

Patch applied with Andy's ACK.

If there are issues we can just revert it.

Yours,
Linus Walleij